rodajes miniatura nsk

Miniature Ball Bearings

1

Miniature Ball Bearings

CAT. NO. E126h

3

We want to thank you for your interest in this edition of our miniature ballbearing catalog. It has been revised with our customers in mind, and wehope it fills your needs.

Recently, technology has been advancing at a remarkable pace, and with ithas come a host of new products in many fields including computers, officeautomation, audio-visual equipment, medical equipment, and many others.These striking innovations present a challenge to bearing manufacturerssince there are ever increasing demands to offer bearings with higherperformance, accuracy, and reliability. Manufacturers of diverse equipmenthave many different bearing requirements including higher speeds, lesstorque, less noise and vibration, zero maintenance, survival in harshenvironments, integration into units, and many more.

This catalog was revised to reflect certain revisions in JIS and ISO, and tobetter serve our customers. The first half contains technical informationabout bearing life, load ratings, limiting speeds, accuracy, lubrication, etc.to facilitate selection of the most appropriate bearing.

The second half presents extensive tables containing most bearing numbersand showing dimensions and pertinent design data listed in the order ofincreasing bore size. Data in the tables are given in both the InternationalUnit System (SI) and Engineering Unit System (Gravitational System ofUnits).

We hope this catalog will allow you to select the optimum bearing for yourapplication. However, if assistance is required, please contact NSK and weengineers will quickly supply the information you need.

Introduction to revised Miniature BallBearing catalog (CAT. No. E 126h)

76

Bearing tablesPage

Contents .......................................................................................... 31

Appendices

Contents .......................................................................................... 53

Appendix 1 Conversion from SI (International Units) system ............ 54

Appendix 2 N – Kgf conversion table ............................................... 56

Appendix 3 Kg – 1b conversion table ............................................... 57

Appendix 4 °C – °F conversion table ............................................... 58

Appendix 5 Viscosity conversion table ............................................. 59

Appendix 6 Inch – mm conversion table .......................................... 60

Appendix 7 Hardness conversion table ........................................... 61

Appendix 8 Values of standard tolerances grades IT ....................... 62

Appendix 9 Physical and mechanical properties of materials ........... 64

Bearing conversion tables

Contents .......................................................................................... 65

Contents

Technical informationPage

1. Bearing types and features ..................................................... 8

2. Formulation of bearing numbers ............................................ 12

3. Cage design .............................................................................. 14

4. Selection of bearing size ......................................................... 14

4.1 Bearing life .............................................................................. 14

4.2 Basic load rating and fatigue life .............................................. 14

4.3 Static load rating and static equivalent load ............................. 16

5. Limiting speeds ........................................................................ 17

6. Bearing tolerances ................................................................... 17

7. Fits and internal clearances .................................................... 22

7.1 Shaft and housing fits .............................................................. 22

7.2 Bearing internal clearances ...................................................... 25

8. Lubrication ................................................................................ 26

8.1 Purposes of lubrication ............................................................ 26

8.2 Lubricating methods and lubricants ......................................... 26

9. Bearing materials ..................................................................... 28

9

Miniature and instrument ball bearings can be divided intotwo basic types, deep groove and angular contact. The first(deep groove) can be further divided into the following fiveclasses depending on their design details:•Standard type•Flanged outer ring•Extended inner ring•Expanded type in which one ring has a radial thickness

that is larger than normal compared with the bearing width.•Thin section type in which both rings are extra thin in the

radial direction.Deep groove ball bearings can also be classified as “Open”,“Shielded”, or “Sealed” depending on the existence and type of seal or shield. The size ranges of extra small andminiature ball bearings are shown in Table 1.1.

Deep groove ball bearings have two inherent advantages;they can sustain some axial load in either direction as well asradial loads, and the two raceway cross-sections are simplecircular arcs which can be very precisely finished so thebearings have low friction and very little noise or vibration.Several different cage designs are available with differentcharacteristics and the choice depends upon the individualapplication.

Deep groove ball bearings with flanged outer ringscorrespond to ordinary ball bearings with snap rings. Theflange extends around the entire circumference of the outerring due to the size limitation and to improve its runningaccuracy. Since it is not necessary to provide a shoulder onthe housing bore if this bearing is used, the bore can be asimple cylindrical shape which facilitates high precisionmachining and also reduces the machining time.

8

1. Bearing types and features

(1 ) Single-row deep groove ball bearings

(2 ) Deep groove ball bearings with flanged outerrings

Deep groove ball bearings with extended inner rings are inchseries bearings with their inner rings extended equally onboth sides by 1/64 inch (0.0156 inch, 0.397 mm) beyond thewidth of the outer ring. Since the inner ring is therefore widerby 1/32 inch than the outer ring, it is not necessary toprovide a projection on parts installed in contact with theinner ring. This feature simplifies the design and fabrication ofparts immediately surrounding the bearing.

(3 ) Deep groove ball bearings with extended innerrings

Ball bearings for synchros are inch series bearings with theirouter rings thickened radially. Their outer diameter is,therefore, large relative to the bore diameter. These bearingsare mainly used for synchros but are convenient in someother applications.

(4 ) Deep groove ball bearings for synchros

Extra-thin-section deep groove ball bearings have a smallradial cross-sectional thickness. NSK offers such bearingswith bore diameters from 10 to 15 mm. They are used whenextreme compactness is important.

(5 ) Extra-thin-section deep groove ball bearings

Design

Metric

Inch

Extra small ball bearings

Outside diameter D≧9

Bore diameter d＜10

Outside diameter D≧9.525

Bore diameter d＜10

Miniature ball bearings

Outside diameter D＜9

Outside diameter D＜9.525

Table 1.1 Size ranges of bearings Units: mm

1110

Bearing types and features

Deep groove ball bearings often have shields or sealsinstalled on both sides and are factory-packed with alubricant. The use of such bearings simplifies the structurearound them and also their installation. It also eliminates theneed for relubrication and, therefore, reduces maintenancecosts. There are three types of such bearings: shieldedbearings, contact sealed bearings, and non-contact sealedbearings.

(6 ) Shielded and sealed bearings

(a) Shielded bearings ZZ1 (Z1), ZZ (Z)Shielded bearings are protected by a shield plate of pressedsteel. The shields can be made of either low carbon steel orstainless steel.

(b) Contact sealed bearings DD (D)Sealed bearings have superior sealing effectivenesscompared to shielded bearings, particularly, the contact typesealed bearings which prevent the intrusion of dust fromoutside because the seal plate lip slides on a seal groove inthe inner ring. The torque is, however, high due to the frictionof the seal lip.

Angular contact ball bearings can sustain radial loads andaxial loads in only one direction. Those with one shoulder onthe outer ring are generally used, but for extra-high speedoperation, bearings with one shoulder on the inner ring areavailable. Angular contact ball bearings must be used induplex pairs with a suitable preload. They are recommendedfor applications requiring high speed and rigidity.

(7 ) Single-row angular contact ball bearings

(c) Non-contact sealed bearings VV (V)With this VV type, a rubber seal with metal backing is held inthe outer ring by the elasticity of the rubber. Effective sealingis achieved by a labyrinth formed between its bore and theseal groove in the inner ring. It has the advantage that thefrictional torque is low because the seal lip does not contactthe seal groove.

ZZ1 ZZ

DD

VV

Examples of bearing numbers(1 ) 68 1X □ □ □ □ T12 ZZ MC3 □ P4 L UC3 AF2 Q → 681XT12ZZMC3P4LUC3 AF2Q(2 ) 62 4 □ □ □ h □ ZZ MC2 E P5 □ □ NS7 L → 624hZZMC2EP5 NS7L(3 ) S MR □ 84 □ □ □ W ZZ MC3 □ P5 □ UC1 PS2 L → SMR84WZZMC3P5UC1 PS2L(4 ) S MF □ 148 □ □ □ J □ MC4 □ P5 L □ □ □ → SMF148JMC4P5L(5 ) S R □ 2 □ □ □ J ZZ MC3 □ 7P □ □ NS7 K → SR2JZZMC37P NS7K

1312

Bearing numbers are alphanumeric combinations that indicatethe bearing type, boundary dimensions, internal clearance,dimensional and running accuracies, and other related specifi-cations. They consist of basic numbers and supplementarysymbols. The boundary dimensions of commonly usedbearings mostly conform to the organizational concept ofISO, and the bearing numbers of these standard bearingsare specified by JIS B 1513 (Designation for rollingbearings). Due to a need for more detailed classification,

NSK uses auxiliary symbols other than those specified by JIS.Basic numbers, supplementary symbols, and the meanings ofcommon numbers and symbols are listed in Table 2.1(Pages 12 and 13). The contact angle symbols and othersupplementary designations are shown in successive columnsfrom left to right in Table 2.1. For reference, five examples ofbearing numbers are shown on Page 13.

2. Formulation of bearing numbers

Table 2.1 Formulation of bearing numbers

Basic numbers Supplementary number

Bearing series symbols Bore number or size number Contact angle symbol Internal design symbol Material symbol Cage symbol Seals, shields symbol

Symbol Meaning Symbol Meaning Symbol Meaning Symbol Meaning Symbol Meaning Symbol MeaningNumber Meaning

6869606263

F68F69F60F62F63

70

72

MR

MF

SMT

R

SR...X

RW

FRW

Single-row deep grooveball bearings

Deep groove ball bearingswith flanged outer rings

Single-row angularcontact ball bearings

Special metric design


Deep groove ball bearingswith flanged outer rings

Thin-section deep grooveball bearings

Inch design


Ball bearings for synchros

Deep groove ball bearingswith extended inner rings

Deep groove ballbearings with extended innerrings, flanged

1

2

3

1X

2X

84

148

41X

82X

133

155

2 ......

......

...

Bearing bore 1 mm

Bearing bore 2 mm

Bearing bore 3 mm

Bearing bore 1.5 mm

Bearing bore 2.5 mm

Brg O.D. 8 mmBrg bore 4 mm

Brg O.D. 14 mmBrg bore 8 mm

Brg O.D. 4 mmBrg bore 1.2 mm

Brg O.D. 8 mmBrg bore 2.5 mm

Brg O.D. 4.762 mm(3/16 inch)

Brg bore 2.380 mm(3/32 inch)

Brg O.D. 7.938 mm(5/16 inch)


Brg O.D. 9.525 mm(3/8 inch)


A

A5

B

C

(Angularcontact ballbearings)

Standardcontact angleof 30°




A

B

Internaldesign differsfrom standardone

Omitted

h

S

High carbonchromiumbearing steelSUJ 2Equivalent toASTM A29552100

StainlesssteelEquivalent toSAE J40551440C

Stainlesssteel forspecial metricand inchdesigns “S”is prefix toseries symbol

Noise level symbol

Symbol Meaning

Omitted

E

ER

Standard

Quieter thanstandard

Quieter thanE

Accuracy class symbol

Symbol Meaning

Omitted

P6

P5

P4

Omitted

3

5P

7P

9P

Normal

Class 6

Class 5

Class 4

ANSI/ABMAABEC 1

ANSI/ABMAABEC 3

ANSI/ABMAInstrumentball bearingsinch designCLASS 5P



Torque symbol

Symbol Meaning

Omitted

L

Standard

Low torque

Special specificationsymbol

Symbol Meaning

U1

U2

UC1

UC2

UC3

...

Specialspecification

Bore diameteris sorted intotwo groups

Outsidediameter issorted intotwo groups

Both boreand outsidediameters aresorted intotwo groups

Lubricant symbol

Symbol Meaning

AF2

NS7

PS2

AEROSHELLFLUID 12

NS HI-LUBE

MULTEMPPS No.2

Lubricant quantitysymbol

Symbol Meaning

Q

K

L

S

H

M

Oil soaking

Greasepacked lessthan L

Standardgreasepackingquantity

Greasepacked morethan L

Greasepacked morethan S

Greasepacked morethan H

J(Omitted)

W(Omitted)

T12T1X

Pressed steelribbon cage

Pressed steelsnap cage

Plastic snapcage

ZZ1

ZZZZ1

D

DD

V

VV

Shieldon one sideonly

Shields onboth sides

Contactrubber sealon one sideonly

Contactrubber sealon both side

Non-contactrubber sealon one sideonly

Non-contactrubber sealon both side

Internal clearance symbol

Symbol Meaning(radial clearance)

MC1

MC2

MC3

MC4

MC5

MC6

Clearance less than MC2

Clearance less than MC3

Upgrade normal clearance

Clearance greater thanMC3



When selecting these specificationsplease consult NSK

If the bearing load, P, and speed, n, are known, determine afatigue life factor, fh, appropriate for the projected life of themachine and then calculate the basic load rating, C, by meansof the following equation:

C= fh・P―――

fn.........................................(4.5)

A bearing which satisfies this value of C should then beselected from the bearing tables.The equivalent load on radial bearings may be calculatedusing the following equation:

P=XFr+ YFa.......................................(4.6)

where P: Equivalent load (N), {kgf}Fr: Radial load (N), {kgf}Fa: Axial load (N), {kgf}X : Radial load factorY : Axial load factor

The values of X and Y are listed in Table 4.1.

1514

In general, the cages used in miniature bearings are eitherribbon cages or snap cages, both made of pressed steel.Pressed steel ribbon cages are generally used in the largerbearings and pressed snap cages in the smaller ones.In recent years, plastic snap cages, which have theadvantages of low torque, long grease life, and low noise,have been used in many kinds of miniature ball bearings.Table 3.1 shows the various types of cages and theirsymbols.

4.1 Bearing lifeThe various functions required of rolling bearings varyaccording to the bearing application. These functions must bepreformed for a prolonged period. Even if bearings areproperly mounted and correctly operated, they will eventuallyfail to perform satisfactorily due to an increase in noise andvibration, loss of running accuracy, deterioration of grease, orfatigue flaking of the rolling surfaces.Bearing life, in the broad sense of the term, is the periodduring which bearings continue to operate and satisfy theirrequired functions. This bearing life may be defined as noiselife, abrasion life, grease life, or rolling fatigue life, dependingon which one causes loss of bearing service.Rolling fatigue life is represented by the total number ofrevolutions at which time the bearing surface will start flakingdue to stress. This is called fatigue life. Even for seeminglyidentical bearings, which are of the same type, size, andmaterial and receive the same heat treatment and otherprocessing, the rolling fatigue life varies greatly even underidentical operating conditions. This is because the flaking ofmaterials due to fatigue is subject to many other variables.Consequently, “rating fatigue life”, in which rolling fatigue lifeis treated as a statistical phenomenon, is used in preferenceto actual rolling fatigue life.Suppose a number of bearings of the same type are operatedindividually under the same conditions. After a certain periodof time, 10 % of them fail as a result of flaking caused byrolling fatigue. The total number of revolutions at this point isdefined as the rating fatigue life or, if the speed is constant,the rating fatigue life is often expressed by the total number ofoperating hours completed when 10 % of the bearingsbecome inoperable due to flaking.

4.2 Basic load rating and fatigue lifeThe basic load rating is defined as the constant load appliedon bearings with stationary outer rings that the inner ringscan endure for a rating life of one million revolutions (106

rev.). The basic load rating of radial bearings is defined as acentral radial load of constant direction and magnitude. Theload ratings are listed under Cr for radial bearings in thebearing tables.In the case of bearings that run at a constant speed, it isconvenient to express the fatigue life is terms of hours.The following relation exists between bearing load and ratingfatigue life:

For radial ball bearings L=（C―P）

3....................(4.1)

where L: Rating fatigue life (106 rev.)P: Bearing load (equivalent load) (N), {kgf}C: Basic load rating (N), {kgf}

For radial bearings, C is written Cr

By designating the rating fatigue life as Lh (h), bearing speedas n (min– 1), fatigue life factor as fh, and speed factor as fn, the following relations are obtained:

Lh= 106

60n（C―P）

3

=500 fh3 ……………(4.2) (Refer to Fig. 4.2)

fh = fnC―P……………………………(4.3)

=（0.03n） ……(4.4) (Refer to Fig. 4.1)– 3―1

3―1

3. Cage design 4. Selection of bearing size

Table 3.1 Cage types and symbols

Type Symbol Name

J

W

T12

T1X

Pressed steel ribboncage

Pressed steel snapcage

Plastic snap cage

Table 4.1 Radial and axial load factors

Cor /Fa

5

10

15

20

25

30

50

1

1

1

1

1

1

1

0

0

0

0

0

0

0

0.56

0.56

0.56

0.56

0.56

0.56

0.56

1.26

1.49

1.64

1.76

1.85

1.92

2.13

0.35

0.29

0.27

0.25

0.24

0.23

0.20

X Y X Y

Fa /Fr≦e Fa /Fr＞ee

Fig. 4.1 Bearing speed and speed factor (n – fn )

Fig. 4.2 Fatigue life factor and rating fatigue life ( fh – Lh )

fn =（――106

―）500×60n

―

Spe

ed fa

ctor

(f n

)

Speed (n), min-1

Fatig

ue li

fe fa

ctor

(f h

)

Rating fatigue life (Lh) , h

17

The L10 life is defined as the rating fatigue life with a statistical reliability of 90 %. Depending on the machines inwhich the bearings are used, sometimes a reliability higherthan 90 % may be required. However, recent improvementsin bearing material have greatly extended the fatigue life. Inaddition, the development of the Elasto-Hydrodynamic Theoryof Lubrication proves that the thickness of the lubricating filmin the contact zone between rings and rolling elementsgreatly influences bearing life. To reflect such improvementsin the calculation of fatigue life, the rating fatigue life iscorrected using the following correction factors:

Lna = a1 a2 a3 L10 .................................(4.7)

where Lna : Adjusted rating life in which reliability, materialimprovements, lubricating conditions, etc. areconsidered

L10 : Rating fatigue life with a reliability of 90 %a1 : Life correction factor for reliabilitya2 : Life correction factor for materiala3 : Life correction factor for operating conditions

The life correction factor for reliability a1 is listed is Table 4.2for reliabilities higher than 90 %.

The life correction factor for material, a2, is greater than onebecause of improvements in bearing steel. NSK now usesvacuum degassed bearing steel, and the results of tests byNSK show that life is greatly improved when compared withearlier materials. The basic load ratings, Cr, listed in thebearing tables were calculated considering the extended lifeachieved by improvements in materials and manufacturingtechniques. Consequently, when estimating life usingEquation (4.7), it is sufficient to assume a2=1.The life correction factor for operating conditions, a3, is usedto correct for various factors, particularly lubrication. If there isno misalignment between the inner and outer rings and thethickness of the lubricating film in the contact zones of thebearing is sufficient, it is possible for a3 to be greater thanone; however, a3 is less than one in the following cases:

•When the viscosity of the lubricant in the contact zonesbetween the raceways and rolling elements is low.

•When the circumferential speed of the rolling elements isvery slow.

•When the bearing temperature is high.•When the lubricant is contaminated by water or foreign

matter.•When misalignment of the inner and outer rings is

excessive.

It is difficult to determine the proper value for a3 for specificoperating conditions because there are still many unknowns.Since the material factor a2 is also influenced by theoperating conditions, there is a proposal to combine a2 anda3 into one quantity (a2�a3), and not conider themindependently. In this case, under normal lubricating andoperating conditions, the product (a2�a3) should be assumedequal to one. However, if the viscosity of the lubricant is toolow, the value drops to as low as 0.2. If there is nomisalignment and a lubricant with high viscosity is used sosufficient fluid-film thickness is secured, the product of (a2�a3)can be set around two.

It is very rare for extra small and miniature ball bearings to failbecause of fatigue. Other problems such as wear, reduced accuracy, or deterioration of the grease define thelimit of bearing life instead of flaking. This is particularly true of audio-visual equipment in which extra low noise andvibration, low torque, or other requirements are highlyimportant. The elapsed time when a bearing fails to satisfy itsfunctional requirements may be regarded as bearing servicelife.

4.3 Static load rating and staticequivalent loadWhen subjected to an excessive load or a strong shock load,rolling bearings may incur a local permanent deformation ofthe rolling elements and raceway surface if the elastic limit isexceeded. The nonelastic deformation increases in area anddepth as the load increases, and when the load exceeds acertain limit, the smooth running of the bearing is impeded.The basic static load rating for deep groove ball bearings isdefined as that static load which produces 4200 MPa {428 kgf/mm2} contact stress at the center of the contact area between the rolling element subjected to the maximumstress and the raceway surface.In this most heavily stressed contact area, the sum of thepermanent deformation of the rolling element and that of theraceway is nearly 0.0001 times the rolling element’s diameter.The basic static load rating, Co, is written “Cor” for radialbearings in the bearing tables.The static equivalent load is a hypothetical load that producesa contact stress equal to the above maximum stress underactual conditions, while the bearing is stationary (includingvery slow rotation or oscillation), in the area of contactbetween the most heavily stressed rolling element andbearing raceway. The greater of the two values calculatedfrom the following equations should be adopted as the staticequivalent load on radial bearings.

Po = XoFr + YoFa.................................(4.8)Po = Fr .............................................(4.9)

where Po : Static equivalent load (N), {kgf}Fr : Radial load (N), {kgf}Fa : Axial load (N), {kgf}Xo : Static radial load factor (0.6)Yo : Static axial load factor (0.5)

The permissible static equivalent load of a bearings variesdepending on its basic static load rating and also theirapplication and operating conditions. The permissible staticload factor, fs, is a safety factor that is applied to the basicstatic load rating. It is defined by the ratio in Equation (4.10).The generally recommended values of fs are listed in Table4.3.

fs = Co―Po

.............................................(4.10)

where Co : Basic static load rating (N), {kgf}Po : Static equivalent load (N), {kgf}

16

The speed of rolling bearings is subject to certain limits.When bearings are operating, the higher the speed, thehigher the bearing temperature due to friction. The limitingspeed is the empirically obtained value for the maximumspeed at which bearings can be continuously operatedwithout failing from seizure or generation of excessive heat.Consequently, the limiting speed of bearings variesdepending on such factors as bearing type and size, cageform and material, load, lubrication method, and heatdissipating method including the design of the bearing’ssurroundings. The maximum permissible speed for contactrubber sealed bearings (DD type) is determined mainly bythe sliding surface speed of the inner circumference of theseal.Values for the limiting speed of bearings lubricated by greaseand oil are listed in the bearing tables. The limiting speeds inthe tables are applicable to bearings of standard design thatare subjected to normal loads, i.e, C/P≧12 and Fa /Fr≦0.2approximately. The limiting speeds for oil lubrication listed inthe bearing tables are for conventional oil bath lubrication.When speeds are more than 70 percent of the listed limitingspeed, it is necessary to select an oil or grease which hasgood high-speed characteristics.When the required speed exceeds the limiting speed of thedesired bearing, then the accuracy grade, internal clearance,cage type and material, and lubrication, must be carefullystudied in order to select a bearing capable of the requiredspeed. If all these conditions are considered, the maximumpermissible speed may be higher than the limiting speedfound in the bearing table. It is recommended that NSK beconsulted regarding high-speed applications.

The tolerances for the boundary dimensions and runningaccuracy of extra small and miniature ball bearings arespecified by ISO 492/582 (Rolling bearings-radial bearingstolerances) and ANSI/ABMA Std. 12.2 (Instrument ballbearings inch design). Tables 6.1, 6.2 and 6.3 apply tometric design extra small and miniature ball bearings.Tables 6.4 and 6.5 apply to inch design extra small andminiature precision ball bearings for instruments.Bearing accuracy should be chosen depending on theapplication. A rough guide for the selection of bearingaccuracy is presented in Table 6.6.

Symbols for boundary dimensions and runningaccuracyd Brg bore dia., nominald ds Deviation of a single bore dia.d dmp Single plane mean bore dia. deviationVdp Bore dia. variation in a single radial planeVdmp Mean bore dia. variation

D Brg outside dia., nominaldDs Deviation of a single outside dia.dDmp Single plane mean outside dia. deviationVDp Outside dia. variation in a single radial planeVDmp Mean outside dia. variationD1 Outside dia. of the outer ring flange, nominaldD1s Deviation of a single outside diameter of the outer

ring flange

B Inner ring width, nominaldBs Deviation of a single inner ring widthVBs Inner ring widht variation

C Outer ring width, nominaldCs Deviation of a single outer ring widthVCs Outer ring width variation

C1 Outer ring flange width, nominaldC1s Deviation of a single outer ring flange widthVD1s Outer ring flange width variation

Kia Radial runout of assembled brg. inner ringKea Radial runout of assembled brg. outer ringSd Inner ring reference face (backface, where

applicable) runout with boreSia Assembled brg. inner ring face (backface) runout

with racewaySD Variation of brg. outside surface generatrix inclination

with outer ring reference face (backface)Sea Assembled brg. outer ring face (backface) runout

with racewaySea1 Assembled brg. outer ring flange back face runout

with raceway

5. Limiting speeds 6. Bearing tolerances

Table 4.2 Reliability factor a1

Reliability (%) 90 95 96 97 98 99

a1 1.00 0.62 0.53 0.44 0.33 0.21

Table 4.3 Values of permissible static load factor fs

Operating conditions of ball bearings

Low-noise applications 2

Bearings subjected to vibration and 1.5shock loads

Standard operating conditions 1

Lower limit of fs

Selection of bearing size

Sea (or Sea1)(2)

max.

Class 4

5

5

5

max.

Class 5

8

8

8

max.

Class 2

1.5

1.5

2.5

SD

max.

Class 5

8

8

8

max.

Class 4

2

2

2.5

max.

Class 6

5

6

7

max.

Class 5

4

4

4

max.

Class 4

2.5

2.5

2.5

max.

Class 2

1.5

1.5

1.5

max.

Normal

10

10

10

max.

Class 5

5

5

5

max.

Class 4

2.5

2.5

2.5

max.

Class 2

1.5

1.5

1.5

max.

Normal

12

15

20

max.

Class 6

12

15

20

high low

— —

0 –250

0 –250

NormalClass 6

high low

0 –250

0 –250

0 –250

Class 5Class 4

high low

0 – 40

0 –120

0 –120

NormalClass 6

Single bearing

1918

Bearing tolerances

Nominal borediameter

d

(mm)

over incl. high low

0 –8

0 –8

0 –8

0.6 (1) 2.5

2.5 10

10 18

d dmp d ds

Normal Class 6 Class 5 Class 4 Class 2

Class 4

Diameter series

0, 2, 3

Class 2

Table 6.1 Tolerances and tolerance limits for inner rings and widths of outer rings (Metric design)

high low

0 –7

0 –7

0 –7

high low

0 –5

0 –5

0 –5

high low

0 –4

0 –4

0 –4

high low

0 –2.5

0 –2.5

0 –2.5

high low

0 –4

0 –4

0 –4

high low max.

9 0 2, 3

Diameter series

Normal

Vdp Vdmp

10

10

10

8

8

8

6

6

6

0 –2.5

0 –2.5

0 –2.5

max.

9 0 2, 3

Diameter series

Class 6

9

9

9

7

7

7

5

5

5

max.

Class 2

2.5

2.5

2.5

max.

9 0, 2, 3

Diameter series

Class 5

5

5

5

4

4

4

max.

9 0, 2, 3

Diameter series

Class 4

4

4

4

3

3

3

max.

Normal

6

6

6

max.

Class 6

5

5

5

max.

Class 5

3

3

3

max.

Class 4

2

2

2

max.

Class 2

1.5

1.5

1.5

Kia

max.

Class 5

7

7

7

max.

Class 4

3

3

3

max.

Class 2

1.5

1.5

1.5

Sd

max.

Class 5

7

7

7

max.

Class 4

3

3

3

max.

Class 2

1.5

1.5

1.5

Siad Bs (or d Cs)(2) VBs (or VCs)

Nominal outsidediameter

D

(mm)

over incl. high low

0 –8

0 –8

0 –9

2.5(1) 6

6 18

18 30

dDmp dDs

Normal Class 6 Class 5 Class 4 Class 2

Class 4

Diameter series

0, 2, 3

Class 2

Table 6.2 Tolerances and tolerance limits for outer rings (Metric design)

high low

0 –7

0 –7

0 –8

high low

0 –5

0 –5

0 –6

high low

0 –4

0 –4

0 –5

high low

0 –2.5

0 –2.5

0 –4

high low

0 –4

0 –4

0 –5

high low max.

9 0 2, 3

Diameter series

Normal

VDp VDmp

10

10

12

8

8

9

6

6

7

0 –2.5

0 –2.5

0 –4

max.

9 0 2, 3

Open type

Class 6

9

9

10

7

7

8

5

5

6

max.

Class 2

Opentype

2.5

2.5

4

max.

9 0, 2, 3

Open type

Class 5

5

5

6

4

4

5

0, 2, 3

Shieldedsealed

9

9

10

2, 3

Shieldedsealed

10

10

12

max.

9 0, 2, 3

Open type

Diameter series Diameter series Diameter series

Class 4

4

4

5

3

3

4

max.

Normal

6

6

7

max.

Class 6

5

5

6

max.

Class 5

3

3

3

max.

Class 2

1.5

1.5

2

Open type

high low

0 –40

0 –40

0 –80

Class 5Class 4

Combined bearings(3) Inner ring(or outer ring)(

2) Inner ring

high low

0 –40

0 –40

0 –80

Class 2


d

(mm)

over incl.

0.6 (1) 2.5

2.5 10

10 18

Notes ( 1) 0.6 mm is included in the group.( 2) Tolerances for width deviation and width dimensional variation of the outer ring are bosed on the

values for the inner ring of the same bearing. Tolerance for the width variation of the outer ring ofClass 5, 4 and 2 are shown in Table 6.2.

( 3) Applicable to individual rings manufactured for combined bearings.

Remarks 1. The cylindrical bore diameter “no-go side” tolerance limit (high) specified in this table does not necessarily apply within a distance of 1.2 times the chamfer dimension r(max.) from the ring face.

2. ANSI/ABMA Std. 20-1996: ABEC1, ABEC3, ABEC5, ABEC7, and ABEC9 are equivalent to Classes Normal, 6, 5, 4 and 2, respectively.

Units: pm

Nominal outsidediameter

D

(mm)

over incl.

2.5(1) 6

6 18

18 30

Kea

Units: pm

max.

Class 4

3

3

4

max.

Normal

15

15

15

max.

Class 6

8

8

9

VCs(3)

max.

Class 4

5

5

5

max.

Class 5

5

5

5

max.

Class 2

1.5

1.5

1.5

max.

Class 5

5

5

6

max.

Class 2

1.5

1.5

2.5

max.

Class 4

4

4

4

max.

Class 2

1.5

1.5

1.5

Notes ( 1) 2.5 mm is included in the group.( 2) Applicable to assembled-bearing flange backface runout with raceway.( 3) The tolerances for outer ring width variation of bearings of Class Normal and 6 are shown in Table 6.1.

Remarks 1. The outside diameter “no-go-side” tolerance (low) specified in this table does not necessarily apply within a distance of 1.2 times the chamfer dimension r(max.) from the ring face.

2. ANSI/ABMA Std. 20-1996: ABEC1, ABEC3, ABEC5, ABEC7, and ABEC9 are equivalent to Classes Normal, 6, 5, 4 and 2, respectively.

Nominal flangeoutside diameter

D1 (mm)

Deviation of outsidediameter flange

dDls

over incl. high low

— 10 +220 –36

10 18 +270 –43

18 30 +330 –52

Units: pm

Table 6.3 Flange tolerances for metric flanged bearings(1) Tolerances of outside diameter flange

Remarks When the tolerance not shown in thetable above, please contact NSK.

dCls

Flanged outer ring

1.3

1.3

1.3

5.1

5.1

5.1

1.3

1.3

1.3

7.6

7.6

7.6

CLASS 5P

1.3

2

2

CLASS 9P

2120

Bearing tolerances

Nominal bearingoutside diameter

D (mm)

over incl. high low

Use the dBs tolerance for d of thesame bearing of the same class

2.5(1) 6

6 18

18 30

Deviation of flange widthd Cls

Normal and Classes 6, 5, 4, 2

max. max. max.

Use the VBstolerance for d ofthe same bearingof the same class

Variation of flange width d Cls

VCls

Normal and Class 6

5

5

5

Class 5

(2) Flange width tolerances and running accuracies related to flange Units: pm

2.5

2.5

2.5

Class 4

1.5

1.5

1.5

Class 2

Variation of brg outside surfacegeneratrix inclinationwith flange backface

SD1

8

8

8

Class 5

4

4

4

Class 4

1.5

1.5

1.5

Class 2

Flange backface runoutwith raceway

Seal

11

11

11

Class 5

7

7

7

Class 4

3

3

3

Class 2

Note ( 1) 2.5 mm is included.


d

(mm)

over incl. high low

0 –5.1

0 –5.1

0 –5.1

— 10

10 18

18 30

d dmp

CLASS 5PCLASS 7P

Table 6.4 Tolerances and tolerance limits for inner rings and widths of outer rings (ANSI/ABMA Standard • Instrument ball bearings • inch design) Units: pm

high low

0 –2.5

0 –2.5

0 –2.5

CLASS 9P

high low

0 –5.1

0 –5.1

0 –5.1

d ds

CLASS 5PCLASS 7P

max.

2.5

2.5

2.5

Vdp

CLASS 5PCLASS 7P

max.

1.3

1.3

1.3

CLASS 9P

high low

0 –2.5

0 –2.5

0 –2.5

CLASS 9P

high low

0 –25.4

0 –25.4

0 –25.4

dBs (or dCs)

CLASS 5PCLASS 7PCLASS 9P

high low

0 –400

0 –400

0 –400

CLASS 5PCLASS 7PCLASS 9P

Single brgs Combined brgs(1)

max.

2.5

2.5

2.5

Vdmp

CLASS 5PCLASS 7P

max.

1.3

1.3

1.3

CLASS 9P

max.

5.1

5.1

5.1

VBs

CLASS 5P

max.

2.5

2.5

2.5

CLASS 7P

max.

1.3

1.3

1.3

CLASS 9P

max.

3.8

3.8

3.8

Kia

CLASS 5P

max.

2.5

2.5

2.5

CLASS 7P

max.

1.3

1.3

2.5

CLASS 9P

max.

7.6

7.6

7.6

Sia

CLASS 5P

max.

2.5

2.5

3.8

CLASS 7P

max.

1.3

1.3

1.3

CLASS 9P

max.

7.6

7.6

7.6

Sd

CLASS 5P

max.

2.5

2.5

3.8

CLASS 7P

max.

1.3

1.3

1.3

Note ( 1) Applicable to bearings for which the axial clearance (preload) is to be adjusted by combining two selected bearings.Remarks CLASSES 5P, 7P and 9P are for precision bearings for instruments.

For the tolerances of Metric Design Pecision Bearings for instruments, it is advisable to consult NSK.

Nominaloutside

diameterD

(mm)

over incl. high low

0 –5.1

0 –5.1

0 –5.1

— 18

18 30

30 50

dDmp

CLASS 5PCLASS 7P

Table 6.5 Tolerances and tolerance limits for outer rings (ANSI/ABMA Standard • Instrument ball bearings • inch design) Units: pm

high low

0 –2.5

0 –3.8

0 –3.8

CLASS 9P

high low

0 –5.1

0 –5.1

0 –5.1

dDs

CLASS 5PCLASS 7P

Open

high low

Shieldedsealed

max.

2.5

2.5

2.5

VDp

CLASS 5PCLASS 7P

CLASS 9P

Open

max.

5.1

5.1

5.1

Shieldedsealed

max.

1.3

2

2

Open

high low

0 –2.5

0 –3.8

0 –3.8

+1 –6.1

+1 –6.1

+1 –6.1

CLASS 9P

Open

high low

0 –25.4

0 –25.4

0 –25.4

dDls Seal(2)

CLASS 5PCLASS 7P

high low

CLASS 5PCLASS 7P

0 –50.8

0 –50.8

0 –50.8

max.

CLASS 5PCLASS 7P

7.6

7.6

7.6

max.

2.5

2.5

2.5

VDmp

CLASS 5PCLASS 7P

CLASS 9P

Open

max.

5.1

5.1

5.1

Shieldedsealed

max.

Open

max.

5.1

5.1

5.1

VCs(1)

CLASS 5P CLASS 7P CLASS 9P

max.

2.5

2.5

2.5

max. max.

SD

CLASS 7P CLASS 9P

max.

3.8

3.8

3.8

max.

1.3

2.5

2.5

max.

Kea


max.

3.8

3.8

5.1

max.

1.3

2.5

2.5

max.

7.6

7.6

7.6

Sea


max.

5.1

5.1

5.1

max.

Notes ( 1) Applicable to flange width variation for flanged bearings, but excluding CLASS 9P.( 2) Applicable to flange back face.

Application

Micro motors, stepping motors, fan motors, VCR pinchrollers, computer printers, copy machine-feed rollers

Bearing tolerance classes

ISO ANSI/ABMA

ABEC 1ABEC 3

NormalClass 6

Table 6.6 Guide for selection of bearing accuracy

High precision motors, hard disk drive motors, dentalspindles, servo motors, encoders, VCR drum spindles,VCR capstan motors, polygonal mirror scanner motors

CLASS 5PCLASS 7P

Class 5Class 4

High frequency spindles, gyro rotors, gyro gimbals CLASS 7P, CLASS 9PClass 4

2322

7. Fits and internal clearances7.1 Shaft and housing fitsThe fitting practice used for bearings is extremely important in achieving their expected performance. Since miniaturebearings are usually used under light loads, the rangebetween a push fit (light interference) and a slip fit (slightlyloose) is generally used.In the case of a rotating inner ring, ordinary ball bearings arefitted to the shaft with interference, however, a slip fit is

generally used for miniature bearings and instrument ballbearings in order to simplify their mounting, prevent damageduring mounting and avoid changing the contact angle orpreload. This is because the occurrence of creep in miniaturebearings is easily prevented by tightening the side face of theinner ring against a shoulder on the shaft with a nut.

When a spring is used to apply a preload to a bearing, thefitting of the bearing ring in contact with the spring should beloosely fitted so the ring slides smoothly. When housings arebuilt of lightweight alloys, the fitting clearance of the outerring will increase with increasing temperature and possiblyimpair the machine's operation and reduce the bearing life;therefore, the bearings should be mounted in a steelbushing.

Tables 7.1 and 7.2 show the recommended fittings forvarious design conditions and applications.Tables 7.3 and 7.4 show allowable tolerances for shafts andhousing bores for various size ranges of miniature ballbearings.

Condition Application Bearingtolerance class Fit Shaft finish

(pm)Suggested

average fit( 1)

Rotatinginner ring

Rotatingouter ring

Low speed

Inner ringaxiallyfree

Inner ringaxially fixed

SynchrosServosPotentiometersResolversGyro gimbals

Class 5Class 4CLASS 5PCLASS 7P

Slightly loose fit(slip fit) φd

–2–7

2L

Rotatinginner ring

Rotatingouter ring

Low speed

SynchrosServosPotentiometersResolversGyro gimbals


Slightly loose fit φD+3– 2

2L

Mediumand highspeeds

Low tohigh speeds

Small motorsElectric toolsVacuum cleanersFan motors

NormalABEC 1


Loose fit φD H6 9L

Computer disk spindles Loose fit( 2) φD+3

04L

Video cassette recorderdrum spindles Slightly loose fit φD

– 2– 5

2TL



NormalClass 6ABEC 1ABEC 3

Gyro rotorsHigh frequency spindles Loose fit φD

+50

5L

Polygonal mirror scannermotors Loose fit( 2) φD

+30

4L

Tape guide rollsPinch rolls

Cam followersTension pulleysIdler gears

Slightly Loose fit

Interference fit

φD+3– 2

φD M5

2L

5T

Low andmediumspeeds

FansSmall motors


Transition fit φd h5 ±0

Mediumand highspeeds

Low tohigh speeds

Computer disk spindles Class 5Class 4CLASS 5PCLASS 7P

Class 4CLASS 7P

Slightlyloose fit( 2) φd

–5–8

4L

Video cassette recorderdrum spindles Close-sliding fit φd

–1–6

1L

Gyro rotorsDental spindlesHigh-frequency spindles

Slightinterference fit(push fit)

φd ±2.5 2T

NormalABEC 1

Vacuum cleanersElectric tools

Lightinterference fit φd js5 5T




Polygonal mirror scannermotors Close-sliding fit φd

–1–6

1L

Gyro rotors Loose fit φd– 5–10

5L

Inner ringaxially free

Inner ringaxiallyfixed

ClutchesSmall fans

Tape guide rollsPinch rolls

Loose fit

Loose fit

φd g5

φd– 5–10

5L

5L

Table 7.1 Inner ring fit with shaft

Condition Application Bearing tolerance class Fit Housing finish

(pm)Suggested

average fit( 1)

Table 7.2 Outer ring fit with housing

Notes ( 1) L: Loose fit, T: Interference fit( 2) After mounting, usually bonded

Notes ( 1) L: Loose fit, T: Interference fit( 2) After mounting, usually bonded

2524

Fits and internal clearances

Shaft dia. (mm)

over

3 –2 to – 5 –2 to – 6 0 to –3 0 to –4 ±1.5 ±2

3 6 –4 to – 8 –4 to – 9 0 to –4 0 to –5 ±2 ±2.5

6 10 –5 to – 9 –5 to –11 0 to –4 0 to –6 ±2 ±3

10 18 –6 to –10 –6 to –14 0 to –5 0 to –8 ±2.5 ±4

incl. g4 g5 h4 h5 js4 js5

Tolerance class for shafts

Table 7.3 Tolerances for shaft diameters Units: pm

Bore dia. (mm)

over

3 +4 to 0 + 6 to 0 ±2 ±3 0 to –4 0 to – 6 –2 to – 6 –2 to – 8

3 6 +5 to 0 + 8 to 0 ±2.5 ±4 0 to –5 +2 to – 6 –3 to – 8 –1 to – 9

6 10 +6 to 0 + 9 to 0 ±3 ±4.5 +1 to –5 +2 to – 7 –4 to –10 –3 to –12

10 18 +8 to 0 +11 to 0 ±4 ±5.5 +2 to –6 +2 to – 9 –4 to –12 –4 to –15

18 30 +9 to 0 +13 to 0 ±4.5 ±6.5 +1 to –8 +2 to –11 –5 to –14 –4 to –17

incl. H5 H6 JS5 JS6 K5 K6 M5 M6

Tolerance class for housings

Table 7.4 Tolerances for housing bores Units: pm

If the accuracy of a shaft or housing does not meet thespecification, the performance of the bearings will be affecedand they will not perform to their full capability. For example,inaccuracy in the squareness of the shaft shoulder may causemisalignment of the bearing inner and outer rings, which mayreduce the bearing fatigue life by adding an edge load inaddition to the normal load. Cage fracture and seizuresometimes occur for this same reason.For normal operating conditions, a truned finish or smoothbored finish is sufficient for the fitting surface; however, aground finish is necessary for applications where vibration andnoise must be low. The accuracy and surface finish of shaftsand housings for normal operating conditions are listed inTable 7.5.

Item Class of bearings Shaft Housing bore

Tolerance forout-of-roundness

Normal, Class 6Class 5, Class 4

to

to IT42

IT32

IT42

IT32 to

to IT32

IT22

IT52

IT42

Tolerance forcylindricality


to

to IT32

IT22

IT42

IT32 to

to IT32

IT22

IT52

IT42

Tolerance forshoulder runout


IT3IT3

IT3 to IT4IT3

Roughness offitting surfaces

Ra

Remarks This table is for general recommendation using the radiusmeasuring method. The basic tolerance (IT) class shouldbe selected in accordance with the bearing precisionclass. For the IT values, please refer to Appendix Table 8(Page 62).

— 0.8 1.6

Table 7.5 Accuracy and roughness of shaft andhousing

7.2 Bearing internal clearancesThe internal clearance of ball bearings greatly influences theirperformance, including fatigue life, vibration, noise, heatgeneration, etc. Consequently, it is necessary to select theproper clearance considering the bearing fit, load, speedand operating temperature.NSK provides clearances in six steps as shown in Table 7.6.To obatin accurate measurements, the clearance is generallymeasured by applying a specified measuring load on thebearing. As a result, the measured clearance is always

slightly lager than the theoretical internal clearance by theamount of elastic deformation caused by the measuring load.The theoretical internal clearance may thus be obtained bycorrecting the measured clearance by the amount of elasticdeformation (refer to Table 7.6 Remark #2).Table 7.7 shows the criteria for selecting the radial clearancefor extra small and miniature ball bearings.

Clearancesymbol

Clearance

min. max.

0 5

min. max.

3 8

min. max.

5 10

min. max.

8 13

min. max.

13 20

min. max.

20 28

MC1 MC2 MC3 MC4 MC5 MC6

Table 7.6 Radial internal clearances in extra small and miniature ball bearings Units: pm

Remarks 1. The standard clearance is MC3.2. To obtain the measured value, add the correction amount in the table below.

Clearancesymbol MC1

Clearancecorrection formeasuring load

1

MC2

1

MC3

1

MC4

1

MC5

2

MC6

2

Units: pm

The measuring loads are as follows:For miniature ball bearings 2.5 N {0.25 kg}For extra small ball bearings 4.4 N {0.45 kgf}

Typical application Requirement Clearancesymbol Remarks

Shafts for precision gears, servo-mechanisms,stepping motors, VCR capstan motors, other low-speed applications

•Small bearing clearance is required with no preload.

•Low torque is not important.•High axial rigidity is not required.

MC1MC2 Avoid interference fits.

Synchros, gyro gimbal radial bearings, VCR drum spindles, computer disk spindles,polygonal mirror scanner motors, other low ormedium-speed applications

•Low torque is required.•Axial load and rigidity are normal.

MC3MC4

Avoid interference fits in mostapplications.

Gyro rotors, gyro gimbal thrust bearings, fanmotors, vacuum cleaners, other high-speed and high-temperature applications

•Extremely low torque is required.

•High endurance and high axialrigidity are required.

MC5MC6

•Either axial clearance is made adjustable or a springpreload is used.

•Interference fit may be allowed.

Table 7.7 Selection of radial clearances

2726

8.1 Purposes of lubricationThe main purpose of lubrication is to reduce friction and wearinside bearings that may cause premature failure.The effects of lubrication can be briefly explained as follows:

(1) Reduction of friction and wearDirect metallic contact between the bearing rings, rollingelements and cage is prevented by a lubricant film.

(2) Extension of fatigue lifeThe rolling fatigue life of bearings depends greatly upon theviscosity and film thickness between the rolling contactsurfaces. Sufficient film thickness prolongs the fatigue lifewhile film thickness shortens it.

(3) Dissipation of frictional heat and coolingCirculating lubrication may be used to carry away frictionalheat or heat transferred from outside the biaring.

(4) OthersAdequate lubrication also helps to prevent foreign matter fromentering bearings and guards against corrosion and rust.

8.2 Lubricating methods andlubricantsLubricating methods are first divided into either grease or oillubrication. Satisfactory bearing performance can be achievedby adopting the lubricating method which is most suitable forthe particular application and operating conditions. In general,oil offers superior lubrication. However, grease lubricationallows a simpler structure around the bearings. A comparisonof grease and oil lubrication is given in Table 8.1.

(1) Grease lubricationSealed (DD, VV) or shielded (ZZ, ZZS) bearings are generallyfactory-packed with the proper quantity of good qualitygrease and can be used as delivered. Too much grease cancause heat generation or grease leakage. Generally, NSK fillsless than half of the free internal space inside bearings withgrease. Because the brand of grease affects bearingperformance, NSK usually recommends those shown inTables 8.2 and 8.3 on page 27. Among them, Multemp PS2is often used as the standard grease for many applications.Besides those listed in Tables 8.2 and 8.3, many otherbrands are available. For assistance when selecting grease,consult NSK.

(2) Oil lubricationOil lubrication is used under conditions where satisfactoryperformance is difficult to achieve using grease, for example,when extremely low torque is required or for high-speedoperation. Particularly in the case of gyro gimbal andsynchros, which are largely affected by frictional torque, a low viscosity oil is used. Oil mist or oil/air lubrication provideslow heating due to agitation and also superior cooling of thebearing. Aeroshell Fluid 12 (MIL-L-6085A) is the standard oilof NSK.

8. Lubrication

Item

Housing structure and sealingmethod

Speed

Cooling effect

Fluidity

Full lubricant replacement

Removal of foreign matter

External contamination due toleakage

Simple

Limiting speed is 65 % to 80 % of that with oillubrication.

Poor

Poor

Sometimes difficult

Removal of particles from grease is impossible.

Surroundings seldom contaminated by leakage.

May be complex. Careful maintenance required.

High limiting speed

Heat transfer is possible using forced oil circulation.

Good

Easy

Easy

Often leaks without proper countermeasures.Not suitable if external contamination must beavoided.

Grease lubrication Oil lubrication

Table 8.1 Comparison of grease and oil lubrication

Grease name

Manufacturer Thickener Base oil Droppingpoint (°C) Consistency

Workingtemperaturerange (°C)

Usable speed limit

(%)Characteristics

MULTEMPPS No.2

Kyodo Yushi Lithium soap Poly-α-olefin oil+ Diester oil

190 275 –50 to +110 100 For low temper-atures, low torque

NS HI-LUBE Kyodo Yushi Lithium soap Polyol ester oil+ Diester oil 192 250 –40 to +130 100

Wide temperaturerange, low noise,low torque

Table 8.2 Specifications of general-purpose greases

Greasesymbol

Thickener Base oil Dropping point (°C) Consistency

Workingtemperaturerange (°C)

Usable speed limit

(%)Characteristics Main applications

VTG Lithium soap Poly-α-olefin oil+ Diester oil

187 315 –50 to +110 100 Low noise, lowtorque

Video cassetterecorder drumspindles

NSC Lithium soapAlkyldiphenyl

ether oil+ Polyol ester oil

192 235 –30 to +140 70Widetemperaturerange

Office automationmachinesFan motors

EA3 Urea Poly-α-olefin oil ＞_ 260 230 –40 to +150 100For high speedsand hightemperatures

Vacuum cleanersCooling fan motorsfor cars

ENS Urea Polyol ester oil ＞_ 260 264 –40 to +160 100 For hightemperatures General purpose

Table 8.3 Specifications of greases developed by NSK

2928

The bearing rings and rolling elements of rolling bearings arerepeatedly subjected to high pressure with a small amount ofsliding. The materials used for the rings and rolling elementsmust there fore have the following characteristics:

•High rolling contact fatigue strength•High hardness•High wear resistance•High dimensional stability•High mechanicalstrength

Other characteristics, such as ease of production, shock andheat resistance, and corrosion resistance, are requireddepending on individual applications.The material used for the rings and balls in miniature ballbearings is either bearing steel or martensitic stainless steel.The chemical composition of each is shown in Table 9.1.Bearing steel provides a longer fatigue life because of its highhardness, and it is also superior with respect to running noiseand torque. Stainless steel has good corrosion

resistance and its hardness does not decrease at hightemperature. Therefore, it is used in applications wherecorrosive elements exist or where operating temperatures areunusually high.NSK uses vacuum degassed bearing steel designated byJapanese Industrial Standard (JIS) as SUJ2 (equivalent toASTM A 295 52100). Its stainless steel is JIS SUS440C(equivalent to SAE J 405 51440C) produced using the ElectroSlag Remelting Method (ESR).NSK selects bearing steels containing a minimum of oxygen,hydrogen, nitrogen, and hydrogen-compound impurities.The rolling fatigue life of bearings has been remarkablyimproved using these materials combined with theappropriate heat treatment.Regarding stainless steel bearings with reduced noise, pleaseconsult NSK.

9. Bearing materials

Bearing Tables

Standard

JIS G 4805 SUJ2 0.95 to 1.10 0.15 to 0.35 Less than 0.50 Less than 0.025 Less than 0.025 1.30 to 1.60 ―

ASTM A 295 52100 0.93 to 1.05 0.15 to 0.35 0.25 to 0.45 Less than 0.025 Less than 0.015 1.30 to 1.60 Less than 0.10

JIS G 4303 SUS 440C 0.95 to 1.20 Less than 1.00 Less than 1.00 Less than 0.040 Less than 0.030 16.00 to 18.00 Less than 0.75

SAE J 405 51440C 0.95 to 1.20 Less than 1.00 Less than 1.00 Less than 0.040 Less than 0.030 16.00 to 18.00 Less than 0.75

SymbolC Si Mn P S Cr Mo

Chemical composition (%)

Table 9.1 Chemical composition of high-carbon chromium bearing steel and stainless steel

31

Bearing Tables

CONTENTS

Deep groove ball bearings Page

Single-row deep groove ball bearings ........................................... 32 – 37

Metric series Bore diameter 1 – 9 mm ................................. 32 – 35

Inch series Bore diameter 1.016 – 9.525 mm ................... 36 – 37

Deep groove ball bearings with flanged outer ring ......................... 38 – 43


Inch series Bore diameter 1.191 – 9.525 mm ................... 42 – 43

Deep groove ball bearings with extended inner ring ...................... 44 – 45

Inch series Bore diameter 1.191 – 7.938 mm

Deep groove ball bearings with extended inner ring, flanged ......... 46 – 47


Ball bearings for synchros ............................................................. 48 – 49


Extra-thin-section deep groove ball bearings ................................ 50 – 51

Metric series Bore diameter 10 – 15 mm

Angular contact ball bearings


32 33

Single-row deep groove ball bearings

Metric series

600, MR

Bore diameter

1 – 4 mm

Boundary dimensions(mm)

d D B B1 r(1)

r1(1)

min. min.

Basic load ratings(N) {kgf}

Cr Cor Cr Cor

Limiting speeds (min-1)

Grease OilOpen OpenZ ·ZZ Z

1

1.2

1.5

2

2.5

3

4

334

4

456

556

677

6788

678

899

1013

7789

101112

1316

11.51.6

1.8

1.222.5

1.522.3

2.52.52.8

1.82.52.52.8

222.5

32.53

45

2—22.5

344

55

———

2.5

22.63

2.32.53

2.533.5

2.63.5—4

2.53—

445

45

—2.534

444

55

0.050.050.1

0.1

0.050.150.15

0.080.10.15

0.150.150.15

0.080.150.20.15

0.10.10.15

0.150.20.15

0.150.2

0.1—

0.15（0.15）

0.20.150.2

0.20.3

———

0.1

0.050.150.15

0.080.10.15

0.150.150.15

0.080.15

—0.15

0.10.1

—

0.150.150.15

0.150.2

—0.10.1（0.15）

0.150.150.2

0.20.3

8080

138

138

112237330

169187330

330385385

208385560550

208390560

560570570

6301 300

310255395640

710960960

1 3001 730

232335

35

336998

505898

98127127

74127179175

74130179

179187187

218485

115107139225

270345345

485670

88

14

14

112434

171934

343939

21395756

214057

575858

64133

32264065

739898

133177

2.52.53.5

3.5

3.57

10

56

10

101313

7.5131818

7.51318

181919

2249

12111423

283535

4968

130 000130 000100 000

110 000

100 00085 00075 000

85 00085 00075 000

75 00063 00063 000

71 00063 00060 00060 000

71 00063 00060 000

60 00056 00056 000

50 00040 000

60 00060 00056 00053 000

50 00048 00048 000

40 00036 000

150 000150 000120 000

130 000

120 000100 000

90 000

100 000100 000

90 000

90 00075 00075 000

80 00075 00067 00071 000

80 00075 00067 000

67 00067 00067 000

60 00048 000

67 00071 00067 00063 000

60 00056 00056 000

48 00043 000

Bearing numbers

Open Shielded Seales

Abutment and fillet dimensions(mm)

da db Da Db ra rb

min. max. max. min. max. max.

Mass(g)

Open Shieldedapprox.

681MR 31

691

MR 41 X

681 X691 X601 X

682MR 52 B

692

MR 62MR 72

602

682 X692 X

MR 82 X602 X

MR 63683 A

MR 83

693MR 93

603

623633

MR 74—

MR 84684 A

MR 104 B694604

624634

———

MR 41 XZZ

681 XZZ691 XZZ601 XZZ

682 ZZMR 52 BZZ

692 ZZ

MR 62 ZZMR 72 ZZ

602 ZZ

682 XZZ692 XZZ

—602 XZZ

MR 63 ZZ683 AZZ

—

693 ZZMR 93 ZZ

603 ZZ

623 ZZ633 ZZ

—MR 74 ZZMR 84 ZZ

684 AZZ

MR 104 BZZ694 ZZ604 ZZ

624 ZZ634 ZZ1

———

—

———

———

———

——

—

———

———

——

————

———

——

———

—

———

———

———

——

—

———

———

——

————

———

——

1.41.41.8

2.0

1.92.72.7

2.62.83.2

3.23.23.2

3.13.74.13.7

3.83.84.2

4.24.64.2

4.24.6

4.8—5.24.8

5.65.25.6

5.66.0

———

1.9

2.12.53.0

2.72.73.0

3.03.83.8

3.73.8—4.1

3.74.0—

4.34.34.3

4.36.0

—4.85.05.2

5.95.65.6

6.07.5

2.62.63.2

3.2

3.63.84.8

4.44.24.8

4.85.85.8

5.45.86.46.8

5.26.26.8

6.87.47.8

8.811.4

6.2—6.88.2

8.49.8

10.4

11.414.0

———

3.5

3.64.35.4

4.24.45.4

5.46.26.2

5.46.2—7.0

5.46.4—

7.37.97.9

8.011.3

—6.37.48.1

8.89.99.9

11.313.8

0.050.050.1

0.1

0.050.150.15

0.080.10.15

0.150.150.15

0.080.150.20.15

0.10.10.15

0.150.20.15

0.150.2

0.1—

0.150.1

0.20.150.2

0.20.3

———

0.1

0.050.150.15

0.080.10.15

0.150.150.15

0.080.15—

0.15

0.10.1—

0.150.150.15

0.150.2

—0.10.10.1

0.150.150.2

0.20.3

0.030.040.09

0.10

0.070.170.33

0.120.160.28

0.300.450.51

0.230.410.560.63

0.200.320.54

0.610.730.87

1.653.38

0.22—

0.360.63

1.041.72.25

3.035.24

———

0.14

0.110.200.38

0.170.230.38

0.290.490.58

0.290.55—

0.83

0.270.45—

0.831.18—

1.663.33

—0.290.561.01

1.421.752.29

3.045.21

Basicbearing

numbers

681MR 31

691

MR 41 X

681 X691 X601 X

682MR 52 B

692

MR 62MR 72

602

682 X692 X

MR 82 X602 X

MR 63683 A

MR 83

693MR 93

603

623633

MR 74MR 74MR 84

684 A

MR 104 B694604

624634

Actual size (2)

Notes (1) The values in parentheses are not based on ISO 15.(2) Actual dimensions of bore and outside diameter only.

Remarks 1. When using bearings with a rotating outer ring, please contact NSK if they are shielded.2. Bearings with double shields (ZZ, ZZ1) are also available with single shields (Z, Z1).

Open type

B

r

r

φD φd

Shielded typeZZ · ZZ1

B1

r1

r1

φD φd

ra

ra

φDa φda φD b

rb

rb

φdb

3534


Metric series

600, MR

Bore diameter

5 – 9 mm


d D B B1 r(1)

r1(1)

min. min.


Cr Cor Cr Cor

Limiting speeds (min-1)Grease Oil

Open OpenZ·ZZ D·DD ZV·W

5

6

7

8

9

889

1011

111314

1619

101213

15171922

111314

17192226

121416

19222428

172024

2630

2—2.53—

345

56

2.533.5

5667

2.533.5

5679

2.53.54

6789

467

810

—2.5344

545

56

345

5667

345

5679

3.545

6789

567

810

0.1—

0.150.15

—

0.150.20.2

0.30.3

0.150.20.15

0.20.30.30.3

0.150.20.15

0.30.30.30.3

0.150.20.2

0.30.30.30.3

0.20.30.3

(0.6)0.6

—0.10.150.150.15

0.150.20.2

0.30.3

0.10.150.15

0.20.30.30.3

0.10.150.15

0.30.30.30.3

0.10.150.2

0.30.30.30.3

0.20.30.3

(0.6)0.6

310278430430715

7151 0801 330

1 7302 340

495715

1 080

1 7302 2602 3403 300

455540

1 170

1 6102 3403 3004 550

545820

1 610

2 2403 3003 3504 550

1 3301 7203 350

4 5505 100

120131168168276

281430505

670885

218292440

670835885

1 370

201276510

710885

1 3701 970

274385710

9101 3701 4301 970

665840

1 430

1 9702 390

3128444473

73110135

177238

5173

110

177231238335

4755

120

164238335465

5683

164

228335340465

136175340

465520

1213171728

294452

6890

223045

688590

140

212852

7390

140201

283973

93140146201

6886

146

201244

53 00053 00050 00050 00048 000

45 00043 00040 000

36 00032 000

45 00043 00040 000

40 00038 00032 00030 000

43 00040 00040 000

36 00036 00030 00028 000

40 00038 00036 000

36 00034 00028 00028 000

36 00034 00032 000

28 00024 000

—————

—40 00038 000

32 00030 000

—40 00038 000

36 00034 00030 00028 000

——

34 000

28 00032 00028 00022 000

—32 00028 000

28 00028 00024 00022 000

24 00024 00024 000

22 000—

63 00063 00060 00060 00056 000

53 00050 00050 000

43 00040 000

53 00050 00050 000

45 00045 00040 00036 000

50 00048 00045 000

43 00043 00036 00034 000

48 00045 00043 000

43 00040 00034 00034 000

43 00040 00038 000

34 00030 000

Bearing numbers

Open Shielded Seales


da db Da Db ra rb

min. max. max. min. max. max.

Mass(g)


MR 85—

MR 95MR 105

—

685695605

625635

MR 106MR 126

686 A

696606626636

MR 117MR 137

687

697607627637

MR 128MR 148

688 A

698608628638

689699609

629639

—MR 85 ZZMR 95 ZZ1MR 105 ZZMR 115 ZZ

685 ZZ695 ZZ1605 ZZ

625 ZZ1635 ZZ1

MR 106 ZZ1MR 126 ZZ

686 A ZZ

696 ZZ1606 ZZ626 ZZ1636 ZZ

MR 117 ZZMR 137 ZZ

687 ZZ1

697 ZZ1607 ZZ1627 ZZ637 ZZ1

MR 128 ZZ1MR 148 ZZ

688 A ZZ1

698 ZZ608 ZZ628 ZZ638 ZZ1

689 ZZ1699 ZZ1609 ZZ

629 ZZ639 ZZ

————VV

—VV—

VVVV

——VV

VVVVVVVV

——VV

VVVVVVVV

—VVVV

VVVVVVVV

VVVVVV

VVVV

—————

—DDDD

DDDD

—DDDD

DDDDDDDD

——DD

DDDDDDDD

—DDDD

DDDDDDDD

DDDDDD

DD—

5.8—6.26.2—

6.26.66.6

7.07.0

7.27.67.2

7.68.08.08.0

8.28.68.2

9.09.09.09.0

9.29.69.6

10.010.010.010.0

10.611.011.0

11.013.0

—5.86.06.06.3

6.26.66.9

7.58.5

7.07.27.4

7.98.28.5

10.5

8.09.08.5

10.29.1

10.512.8

9.09.2

10.2

10.010.512.012.8

11.512.012.0

12.816.1

7.2—7.88.8—

9.811.412.4

14.017.0

8.810.411.8

13.415.017.020.0

9.811.412.8

15.017.020.024.0

10.812.414.4

17.020.022.026.0

15.418.022.8

24.026.0

—7.48.28.49.8

9.911.212.2

13.816.5

9.310.911.7

13.314.816.519.0

10.511.612.7

14.816.519.022.8

11.312.814.2

16.519.020.522.8

15.217.220.5

22.825.6

0.1—0.150.15—

0.150.20.2

0.30.3

0.150.20.15

0.20.30.30.3

0.150.20.15

0.30.30.30.3

0.150.20.2

0.30.30.30.3

0.20.30.3

0.30.6

—0.10.150.150.15

0.150.20.2

0.30.3

0.10.150.15

0.20.30.30.3

0.10.150.15

0.30.30.30.3

0.10.150.2

0.30.30.30.3

0.20.30.3

0.30.6

0.26—

0.500.95—

1.22.453.54

4.958.56

0.561.271.91

3.885.978.15

14

0.621.582.13

5.267.67

12.724

0.711.863.12

7.2312.117.228.3

3.538.45

14.5

19.536.5

—0.340.581.291.5

1.962.53.48

4.868.34

0.681.742.69

3.726.087.94

14

0.722.022.97

5.127.51

12.925

0.972.164.02

7.1812.217.428.6

4.438.33

14.7

19.336

Basicbearing

numbers

MR 85MR 85MR 95MR 105MR 115

685695605

625635

MR 106MR 126

686 A

696606626636

MR 117MR 137

687

697607627637

MR 128MR 148

688 A

698608628638

689699609

629639

Actual size (2)


Remarks 1. When using bearings with a rotating outer ring, please contact NSK if they are sealed or shielded.2. Bearings with double shields (ZZ, ZZ1) are also available with single shields (Z, Z1).3. Bearings with snap rings are also available, please contact NSK.

Open type

B

r

r

φD φd


B1

r1

r1

φD φd

Non-contactsealed type

VV

B1

r1

r1

φD φd

Contact sealed typeDD

B1

r1

r1

φD φd

ra

ra

φDa φd a

rb

rb

φD b φd b

36 37


Inch series

R

Bore diameter

1.016 – 9.525 mm

Boundary dimensions(mm/inch)

d D B B1 rmin.


Cr Cor Cr Cor


Grease OilOpen OpenZ·ZZ Z

1.016

1.191

1.397

1.984

2.380

3.175

3.967

4.762

6.350

7.938

9.525

3.175

3.967

4.762

6.350

4.7624.7627.938

6.3507.9389.525

9.52512.700

7.938

7.9389.525

12.700

9.52512.700

15.87519.050

12.700

22.225

0.0400

0.0469

0.0550

0.0781

0.0937

0.1250

0.1562

0.1875

0.2500

0.3125

0.3750

0.1250

0.1562

0.1875

0.2500

0.18750.18750.3125

0.25000.31250.3750

0.37500.5000

0.3125

0.31250.37500.5000

0.37500.5000

0.62500.7500

0.5000

0.8750

0.0469

0.0625

0.0781

0.0937

0.0625—

0.1094

0.09370.10940.1094

0.15620.1719

0.1094

0.10940.12500.1562

0.12500.1250

0.19600.2188

0.1562

0.2188

—

0.0937

0.1094

0.1406

—0.09370.1406

0.10940.14060.1406

0.15620.1719

0.1250

0.12500.12500.1960

0.12500.1875

0.19600.2812

0.1562

0.2812

—

2.380

2.779

3.571

—2.3803.571

2.7793.5713.571

3.9674.366

3.175

3.1753.1754.978

3.1754.762

4.9787.142

3.967

7.142

0.1

0.1

0.1

0.1

0.10.10.15

0.10.10.15

0.30.3

0.1

0.10.10.3

0.10.15

0.30.4

0.15

0.4

80

138

231

310

188143550

283560640

630640

360

360710

1 300

4201 080

1 6102 620

540

3 350

23

35

66

108

6052

175

95179225

218225

149

149270485

204440

6601 060

276

1 410

8

14

24

32

191556

295765

6465

37

3773

133

43110

164267

55

340

2.5

3.5

6.5

11

65.5

18

9.51823

2223

15

152849

2145

68108

28

144

130 000

110 000

90 000

67 000

80 00080 00060 000

67 00060 00053 000

56 00053 000

53 000

53 00050 00043 000

48 00040 000

38 00036 000

40 000

32 000

150 000

130 000

110 000

80 000

95 00095 00071 000

80 00067 00063 000

67 00063 000

63 000

63 00060 00053 000

56 00050 000

45 00043 000

48 000

38 000

Note (1) Actual dimensions of bore and outside diameter only.Remarks 1. When using bearings with a rotating outer ring, please contact NSK if they are shielded.

2. Bearings with double shields (ZZ, ZZS) are also available with single shields (Z, ZS).

Bearing numbers

Open Shielded


da db Da Db ra

min. max. max. min. max.

Mass(g)


R 09

R 0

R 1

R 1-4

R 133—R 1-5

R 144R 2-5R 2-6

R 2R 2 A

R 155

R 156R 166R 3

R 168 BR 188

R 4 BR 4 AA

R 1810

R 6

—

R 0 ZZ

R 1 ZZ

R 1-4 ZZ

—R 133 ZZSR 1-5 ZZ

R 144 ZZR 2-5 ZZR 2-6 ZZS

R 2 ZZR 2 A ZZ

R 155 ZZS

R 156 ZZSR 166 ZZR 3 ZZ

R 168 B ZZR 188 ZZ

R 4 B ZZR 4 AA ZZ

R 1810 ZZ

R 6 ZZ

1.9

2.0

2.2

2.8

3.2—3.6

4.04.04.4

5.25.2

4.8

5.65.66.8

7.27.6

8.49.4

9.2

12.6

—

1.9

2.3

3.9

—3.04.1

3.94.34.6

4.84.6

5.5

5.55.96.5

7.07.4

8.49.0

9.0

11.9

2.3

3.1

3.9

5.5

3.9—6.7

5.57.18.3

7.510.7

7.1

7.18.7

10.7

8.711.5

13.816.0

11.5

19.2

—

3.5

4.1

5.9

—4.27.0

5.97.38.2

8.08.2

7.3

7.38.8

11.2

8.911.6

13.816.6

11.6

20.0

0.1

0.1

0.1

0.1

0.10.10.15

0.10.10.15

0.30.3

0.1

0.10.10.3

0.10.15

0.30.4

0.15

0.4

0.04

0.09

0.15

0.35

0.10―0.60

0.250.550.96

1.363.3

0.51

0.390.812.21

0.581.53

4.507.48

1.56

9.02

—

0.11

0.19

0.50

―0.130.72

0.270.721.13

1.393.23

0.56

0.420.852.79

0.622.21

4.439.17

1.48

11

Basicbearing

numbers

R 09

R 0

R 1

R 1-4

R 133R 133R 1-5

R 144R 2-5R 2-6

R 2R 2 A

R 155

R 156R 166R 3

R 168 BR 188

R 4 BR 4 AA

R 1810

R 6

Actual size (1)

Open type

B

r

r

φD φd

Shielded typeZZ · ZZS

B1

r

r

φD φd

ra

ra

φDa φda

ra

ra

φDb φdb

1.191

1.588

1.984

2.380

1.588—

2.779

2.3802.7792.779

3.9674.366

2.779

2.7793.1753.967

3.1753.175

4.9785.558

3.967

5.558

38 39

Metric series

F600, MF

Bore diameter

1 – 4 mm


d D D1 D2 B B1 C1 C2 r(1)

r1(1)

min. min.


Cr Cor Cr Cor



1

1.2

1.5

2

2.5

3

4

34

4

456

556

677

6788

678

899

1013

7789

101112

1316

3.85

4.8

56.57.5

6.16.27.5

7.28.28.5

7.18.59.29.5

7.28.19.2

9.510.210.511.515

8.2—9.2

10.3

11.212.513.5

1518

——

—

56.57.5

6.16.27.5

—8.28.5

7.18.5—9.5

7.28.1—

9.510.610.511.515

—8.29.2

10.3

11.612.513.5

1518

11.6

1.8

1.222.5

1.522.3

2.52.52.8

1.82.52.52.8

222.5

32.5345

2—22.5

344

55

——

—

22.63

2.32.53

—33.5

2.63.5—4

2.53—

44545

—2.534

444

55

0.30.5

0.4

0.40.60.6

0.50.60.6

0.60.60.7

0.50.70.60.7

0.60.50.6

0.70.60.711

0.6—0.60.6

0.611

11

——

—

0.60.80.8

0.60.60.8

—0.60.9

0.80.9—0.9

0.60.8—

0.90.8111

—0.60.61

0.811

11

0.050.1

0.1

0.050.150.15

0.080.10.15

0.150.150.15

0.080.150.20.15

0.10.10.15

0.150.20.150.150.2

0.1—

0.15（0.15）

0.20.150.2

0.20.3

——

—

0.050.150.15

0.080.10.15

—0.150.15

0.080.15—

0.15

0.10.1—

0.150.150.150.150.2

—0.10.1（0.15）

0.150.150.2

0.20.3

80138

138

112237330

169187330

330385385

208385560550

208390560

560570570630

1 300

310255395640

710960960

1 3001 730

2335

35

336998

505898

98127127

74127179175

74130179

179187187218485

115107139225

270345345

485670

814

14

112434

171934

343939

21395756

214057

57585864

133

32264065

739898

133177

2.53.5

3.5

3.57

10

56

10

101313

7.5131818

7.51318

1819192249

12111423

283535

4968

130 000100 000

110 000

100 00085 00075 000

85 00085 00075 000

75 00063 00063 000

71 00063 00060 00060 000

71 00063 00060 000

60 00056 00056 00050 00036 000

60 00060 00056 00053 000

50 00048 00048 000

40 00036 000

150 000120 000

130 000

120 000100 000

90 000

100 000100 000

90 000

90 00075 00075 000

80 00067 00071 00071 000

80 00075 00067 000

67 00067 00067 00060 00043 000

67 00071 00067 00063 000

60 00056 00056 000

48 00043 000

Bearing numbers

Open Shielded Sealed


da db ra rb

min. max. max. max.

Mass(g)


F 681F 691

MF 41 X

F 681 XF 691 XF 601 X

F 682MF 52 B

F 692

MF 62MF 72

F 602

F 682 XF 692 X

MF 82 XF 602 X

MF 63F 683 A

MF 83

F 693MF 93

F 603F 623F 633

MF 74—

MF 84F 684

MF 104 BF 694F 604

F 624F 634

F 681F 691

MF 41 X

F 681 XF 691 XF 601 X

F 682MF 52 B

F 692

MF 62MF 72

F 602

F 682 XF 692 X

MF 82 XF 602 X

MF 63F 683 A

MF 83

F 693MF 93

F 603F 623F 633

MF 74MF 74MF 84

F 684

MF 104 BF 694F 604

F 624F 634

——

—

F 681 XZZF 691 XZZF 601 XZZ

F 682 ZZMF 52 B ZZ

F 692 ZZ

—MF 72 ZZ

F 602 ZZ

F 682 XZZF 692 XZZ

—F 602 XZZ

MF 63 ZZF 683 A ZZ

—

F 693 ZZMF 93 ZZ

F 603 ZZF 623 ZZF 633 ZZ

—MF 74 ZZMF 84 ZZ

F 684 ZZ

MF 104 B ZZF 694 ZZF 604 ZZ

F 624 ZZF 634 ZZ1

——

—

———

———

———

————

———

—————

————

———

——

——

—

———

———

———

————

———

—————

————

———

——

1.41.8

2.0

1.92.72.7

2.62.83.2

3.23.23.2

3.13.74.13.7

3.83.84.2

4.24.64.24.24.6

4.8—5.24.8

5.65.25.6

5.66.0

——

—

2.12.53.0

2.72.73.0

—3.83.8

3.73.8—4.1

3.74.0—

4.34.34.34.36.0

—4.85.05.2

5.95.65.6

6.07.5

0.050.1

0.1

0.050.150.15

0.080.10.15

0.150.150.15

0.080.150.20.15

0.10.10.15

0.150.20.150.150.2

0.1—

0.150.1

0.20.150.2

0.20.3

——

—

0.050.150.15

0.080.10.15

—0.150.15

0.080.15—

0.15

0.10.1—

0.150.150.150.150.2

—0.10.10.1

0.150.150.2

0.20.3

0.040.14

0.12

0.090.210.42

0.160.210.35

0.360.520.60

0.250.510.620.74

0.270.370.56

0.700.811.01.853.73

0.29—

0.440.70

1.131.912.53

3.385.73

——

—

0.140.280.52

0.220.270.48

—0.560.71

0.360.68—

0.98

0.330.53—

0.971.341.631.863.59

—0.350.631.14

1.591.962.53

3.535.65

Basicbearing

numbers Actual size (2)


Remarks 1. When using bearings with a rotating outer ring, please contact NSK if they are shielded.2. Bearings with double shields (ZZ, ZZ1) are also available with single shields (Z, Z1).

Open type

BC1

r

r

φD φD1φd


B1 C2

r1

r1

φD φd φD2

ra

φda

rb

φdb

Deep groove ball bearingswith flanged outer ring

40 41

Metric series

F600, MF

Bore diameter

5 – 9 mm


d D D1 D2 B B1 C1 C2 r r1

min. min.


Cr Cor Cr Cor

Limiting speeds (min-1)Grease Oil

Open OpenZ·ZZ D·DD ZV·W

5

6

7

8

9

889

10

111314

1619

101213

15171922

111314

171922

121416

1922

1720

9.2—

10.211.2

12.51516

1822

11.213.215

17192225

12.214.216

192225

13.215.618

2225

1923

—9.2

10.211.6

12.51516

1822

11.213.615

17192225

12.214.616

192225

13.615.618

2225

1923

2—2.53

345

56

2.533.5

5667

2.533.5

567

2.53.54

67

46

—2.534

545

56

345

5667

345

567

3.545

67

56

0.6—0.60.6

0.811

11.5

0.60.61

1.21.21.51.5

0.60.61

1.21.51.5

0.60.81

1.51.5

11.5

—0.60.60.8

111

11.5

0.60.81.1

1.21.21.51.5

0.60.81.1

1.21.51.5

0.80.81.1

1.51.5

1.11.5

0.1—

0.150.15

0.150.20.2

0.30.3

0.150.20.15

0.20.30.30.3

0.150.20.15

0.30.30.3

0.150.20.2

0.30.3

0.20.3

—0.10.150.15

0.150.20.2

0.30.3

0.10.150.15

0.20.30.30.3

0.10.150.15

0.30.30.3

0.10.150.2

0.30.3

0.20.3

310278430430

7151 0801 330

1 7302 340

495715

1 080

1 7302 2602 3403 300

455540

1 170

1 6102 3403 300

545820

1 610

2 2403 300

1 3301 720

120131168168

281430505

670885

218292440

670835885

1 370

201276510

710885

1 370

274385710

9101 370

665840

31284444

73110135

177238

5173

110

177231238335

4755

120

164238335

5683

164

228335

136175

12131717

294452

6890

223045

688590

140

212852

7390

140

283973

93140

6886

53 00053 00050 00050 000

45 00043 00040 000

36 00032 000

45 00043 00040 000

40 00038 00032 00030 000

43 00040 00040 000

36 00036 00030 000

40 00038 00036 000

36 00034 000

36 00034 000

————

―40 00038 000

32 00030 000

—40 00038 000

36 00034 00030 00028 000

——

34 000

28 00032 00028 000

—32 00030 000

28 00028 000

24 00024 000

63 00063 00060 00060 000

53 00050 00050 000

43 00040 000

53 00050 00050 000

45 00045 00040 00036 000

50 00048 00045 000

43 00043 00036 000

48 00045 00043 000

43 00040 000

43 00040 000

Bearing numbers

Open Shielded Sealed


da db ra rb

min. max. max. max.

Mass(g)


MF 85—

MF 95MF 105

F 685F 695F 605

F 625F 635

MF 106MF 126

F 686 A

F 696F 606F 626F 636

MF 117MF 137

F 687

F 697F 607F 627

MF 128MF 148

F 688 A

F 698F 608

F 689F 699

MF 85MF 85MF 95MF 105

F 685F 695F 605

F 625F 635

MF 106MF 126

F 686 A

F 696F 606F 626F 636

MF 117MF 137

F 687

F 697F 607F 627

MF 128MF 148

F 688 A

F 698F 608

F 689F 699

—MF 85 ZZMF 95 ZZ1MF 105 ZZ

F 685 ZZF 695 ZZF 605 ZZ

F 625 ZZ1F 635 ZZ1

MF 106 ZZ1MF 126 ZZ

F 686 A ZZ

F 696 ZZ1F 606 ZZF 626 ZZ1F 636 ZZ

MF 117 ZZMF 137 ZZ

F 687 ZZ1

F 697 ZZ1F 607 ZZ1F 627 ZZ

MF 128 ZZ1MF 148 ZZ

F 688 A ZZ1

F 698 ZZF 608 ZZ

F 689 ZZ1F 699 ZZ1

————

—VV—

VVVV

——VV

VVVVVVVV

——VV

VVVVVV

—VVVV

VVVV

VVVV

————

—DDDD

DDDD

—DDDD

DDDDDDDD

——DD

DDDDDD

—DDDD

DDDD

DDDD

5.8—6.26.2

6.26.66.6

7.07.0

7.27.67.2

7.68.08.08.0

8.28.68.2

9.09.09.0

9.29.69.6

10.010.0

10.611.0

—5.86.06.0

6.26.66.9

7.58.5

7.07.27.4

7.98.28.5

10.5

8.09.08.5

10.29.1

10.5

9.09.2

10.2

10.010.5

11.512.0

0.1—

0.150.15

0.150.20.2

0.30.3

0.150.20.15

0.20.30.30.3

0.150.20.15

0.30.30.3

0.150.20.2

0.30.3

0.20.3

—0.10.150.15

0.150.20.2

0.30.3

0.10.150.15

0.20.30.30.3

0.10.150.15

0.30.30.3

0.10.150.2

0.30.3

0.20.3

0.33—0.591.05

1.372.793.9

5.379.49

0.651.382.25

4.346.589.09

14.6

0.721.72.48

5.658.66

14.2

0.822.093.54

8.3513.4

3.979.51

—0.410.661.46

2.182.843.85

5.39.49

0.771.943.04

4.266.619.09

14.7

0.822.233.37

5.658.66

14.2

1.152.394.47

8.313.5

4.919.51

Basicbearing



2. Bearings with double shields (ZZ, ZZ1) are also available with single shields (Z, Z1).

Open type

B

r

r

φD φd φD1

C1


B1 C2

r1

r1

φD φd φD2

Non-contactsealed type

VV

B1 C2

r1

r1

φD φd φD2

Contact sealed typeDD

B1 C2

r1

r1

φD φd φD2

ra

φda

rb

φdb


42 43


Inch series

FR

Bore diameter

1.191 – 9.525 mm


d D D1 B B1 C1 C2 rmin.


Cr Cor Cr Cor



1.191

1.397

1.984

2.380

3.175

3.967

4.762

6.350

7.938

9.525

3.967

4.762

6.350

4.7624.7627.938

6.3507.9389.5259.525

7.938

7.9389.525

12.700

9.52512.70015.875

12.700

22.225

5.156

5.944

7.518

5.9445.9449.119

7.5189.119

10.71911.176

9.119

9.11910.71914.351

10.71913.89417.526

13.894

24.613

0.0469

0.0550

0.0781

0.0937

0.1250

0.1562

0.1875

0.2500

0.3125

0.3750

0.1562

0.1875

0.2500

0.18750.18750.3125

0.25000.31250.37500.3750

0.3125

0.31250.37500.5000

0.37500.50000.6250

0.5000

0.8750

0.203

0.234

0.296

0.2340.2340.359

0.2960.3590.4220.440

0.359

0.3590.4220.565

0.4220.5470.690

0.547

0.969

0.0625

0.0781

0.0937

0.0625—

0.1094

0.09370.10940.10940.1562

0.1094

0.10940.12500.1960

0.12500.12500.1960

0.1562

0.2812

0.0937

0.1094

0.1406

—0.09370.1406

0.10940.14060.14060.1562

0.1250

0.12500.12500.1960

0.12500.18750.1960

0.1562

0.2812

0.013

0.023

0.023

0.018—

0.023

0.0230.0230.0230.030

0.023

0.0230.0230.042

0.0230.0230.042

0.031

0.062

0.031

0.031

0.031

—0.0310.031

0.0310.0310.0310.030

0.036

0.0360.0310.042

0.0360.0450.042

0.031

0.062

1.588

1.984

2.380

1.588—

2.779

2.3802.7792.7793.967

2.779

2.7793.1754.978

3.1753.1754.978

3.967

7.142

2.380

2.779

3.571

—2.3803.571

2.7793.5713.5713.967

3.175

3.1753.1754.978

3.1754.7624.978

3.967

7.142

0.330

0.580

0.580

0.460—

0.580

0.5800.5800.5800.760

0.580

0.5800.5801.070

0.5800.5801.070

0.790

1.570

0.790

0.790

0.790

—0.7900.790

0.7900.7900.7900.760

0.910

0.9100.7901.070

0.9101.1401.070

0.790

1.570

0.1

0.1

0.1

0.10.10.15

0.10.10.150.3

0.1

0.10.10.3

0.10.150.3

0.15

0.4

138

231

310

188143550

283560640630

360

360710

1 300

4201 0801 610

540

3 350

35

66

108

6052

175

95179225218

149

149270485

204440660

276

1 410

14

24

32

191556

29576564

37

3773

133

43110164

55

340

3.5

6.5

11

65.5

18

9.5182322

15

152849

214568

28

144

110 000

90 000

67 000

80 00080 00060 000

67 00060 00053 00056 000

53 000

53 00050 00043 000

48 00040 00038 000

40 000

32 000

130 000

110 000

80 000

95 00095 00071 000

80 00067 00063 00067 000

63 000

63 00060 00053 000

56 00050 00045 000

48 000

38 000

Bearing numbers

Open Shielded


da db ra

min. max. max.

Mass(g)


FR 0

FR 1

FR 1-4

FR 133—

FR 1-5

FR 144FR 2-5FR 2-6FR 2

FR 155

FR 156FR 166FR 3

FR 168 BFR 188FR 4 B

FR 1810

FR 6

FR 0 ZZ

FR 1 ZZ

FR 1-4 ZZ

—FR 133 ZZSFR 1-5 ZZ

FR 144 ZZFR 2-5 ZZFR 2-6 ZZSFR 2 ZZ

FR 155 ZZS

FR 156 ZZSFR 166 ZZFR 3 ZZ

FR 168 BZZFR 188 ZZFR 4 BZZ

FR 1810 ZZ

FR 6 ZZ

FR 0

FR 1

FR 1-4

FR 133FR 133FR 1-5

FR 144FR 2-5FR 2-6FR 2

FR 155

FR 156FR 166FR 3

FR 168 BFR 188FR 4 B

FR 1810

FR 6

2.0

2.2

2.8

3.2—3.6

4.04.04.45.2

4.8

5.65.66.8

7.27.68.4

9.2

12.6

1.9

2.3

3.9

—3.04.1

3.94.34.64.8

5.5

5.55.96.5

7.07.48.4

9.0

11.9

0.1

0.1

0.1

0.10.10.15

0.10.10.150.3

0.1

0.10.10.3

0.10.150.3

0.15

0.4

0.11

0.20

0.41

0.13―

0.68

0.310.621.041.51

0.59

0.470.902.97

0.661.644.78

1.71

10.1

0.16

0.25

0.58

—0.190.82

0.350.811.251.55

0.67

0.530.983.09

0.752.494.78

1.63

12.1

Basicbearing




Open type

C1

r

r

φD φd φD1

B


B1 C2

r

r

φD φd φD1

ra

φda

ra

φdb

44 45

RW 09

RW 0

RW 1

RW 1-4

RW 133RW 133RW 1-5

RW 144RW 2-5RW 2-6RW 2

RW 155

RW 156RW 166RW 3

RW 168 BRW 188RW 4 B

RW 1810

RW 6

RW 09

RW 0

RW 1

RW 1-4

RW 133—

RW 1-5

RW 144RW 2-5RW 2-6RW 2

RW 155

RW 156RW 166RW 3

RW 168 BRW 188RW 4 B

RW 1810

RW 6

—

RW 0 ZZ

RW 1 ZZ

RW 1-4 ZZ

—RW 133 ZZSRW 1-5 ZZ

RW 144 ZZRW 2-5 ZZRW 2-6 ZZSRW 2 ZZ

RW 155 ZZS

RW 156 ZZSRW 166 ZZRW 3 ZZ

RW 168 BZZRW 188 ZZRW 4 BZZ

RW 1810 ZZ

—

Deep groove ball bearingswith extended inner ring

Inch series

RW

Bore diameter

1.016 – 9.525 mm


d D B B1 C C1 rmin.


Cr Cor Cr Cor



1.016

1.191

1.397

1.984

2.380

3.175

3.967

4.762

6.350

7.938

9.525

3.175

3.967

4.762

6.350

4.7624.7627.938

6.3507.9839.5259.525

7.938

7.9389.525

12.700

9.52512.70015.875

12.700

22.225

1.984

2.380

2.779

3.175

2.380—

3.571

3.1753.5713.5714.762

3.571

3.5713.9674.762

3.9673.9675.771

4.762

7.142

—

3.175

3.571

4.366

—3.1754.366

3.5714.3664.3664.762

3.967

3.9673.9675.771

3.9675.5585.771

4.762

—

1.191

1.588

1.984

2.380

1.588—

2.779

2.3802.7792.7793.967

2.779

2.7793.1753.967

3.1753.1754.978

3.967

5.558

—

2.380

2.779

3.571

—2.3803.571

2.7793.5713.5713.967

3.175

3.1753.1754.978

3.1754.7624.978

3.967

—

0.1

0.1

0.1

0.1

0.10.10.15

0.10.10.150.3

0.1

0.10.10.3

0.10.150.3

0.15

0.4

80

138

231

310

188143550

283560640630

360

360710

1 300

4201 0801 610

540

3 350

23

35

66

108

6052

175

95179225218

149

149270485

204440660

276

1 410

8

14

24

32

191556

29576564

37

3773

133

43110164

55

340

2.5

3.5

6.5

11

65.5

18

9.5182322

15

152849

214568

28

144

130 000

110 000

90 000

67 000

80 00080 00060 000

67 00060 00053 00056 000

53 000

53 00050 00043 000

48 00040 00038 000

40 000

32 000

150 000

130 000

110 000

80 000

95 00095 00071 000

80 00067 00063 00067 000

63 000

63 00060 00053 000

56 00050 00045 000

48 000

38 000

Bearing numbers

Open Shielded


da db Da Db ra

min. max. max. min. max.

Mass(g)


1.9

2.0

2.2

2.8

3.2—

3.6

4.04.04.45.2

4.8

5.65.66.8

7.27.68.4

9.2

12.6

—

1.9

2.3

3.9

—3.04.1

3.94.34.64.8

5.5

5.55.96.5

7.07.48.4

9.0

—

2.3

3.1

3.9

5.5

3.9—

6.7

5.57.18.37.5

7.1

7.18.7

10.7

8.711.513.8

11.5

19.2

—

3.5

4.1

5.9

—4.27.0

5.97.38.28.0

7.3

7.38.8

11.2

8.911.613.8

11.6

—

0.1

0.1

0.1

0.1

0.10.10.15

0.10.10.150.3

0.1

0.10.10.3

0.10.150.3

0.15

0.4

0.05

0.11

0.17

0.46

0.12―

0.63

0.300.741.01.4

0.56

0.440.822.33

0.621.74.72

1.9

10

—

0.16

0.25

0.46

—0.170.73

0.330.741.11.3

0.62

0.490.872.90

0.662.14.62

1.6

—

Basicbearing




Open type

C

B

r

r

φD φd


C1

B1

r

r

φD φd

ra

φDa φda φDb φdb

ra

0.0400

0.0469

0.0550

0.0781

0.0937

0.1250

0.1562

0.1875

0.2500

0.3125

0.3750

0.1250

0.1562

0.1875

0.2500

0.18750.18750.3125

0.25000.31250.37500.3750

0.3125

0.31250.37500.5000

0.37500.50000.6250

0.5000

0.8750

0.0781

0.0937

0.1094

0.1250

0.0937—

0.1406

0.12500.14060.14060.1875

0.1406

0.14060.15620.1875

0.15620.15620.2272

0.1875

0.2812

—

0.1250

0.1406

0.1719

—0.12500.1719

0.14060.17190.17190.1875

0.1562

0.15620.15620.2272

0.15620.21880.2272

0.1875

—

0.0469

0.0625

0.0781

0.0937

0.0625—

0.1094

0.09370.10940.10940.1562

0.1094

0.10940.12500.1562

0.12500.12500.1960

0.1562

0.2188

—

0.0937

0.1094

0.1406

—0.09370.1406

0.10940.14060.14060.1562

0.1250

0.12500.12500.1960

0.12500.18750.1960

0.1562

—

46 47

FRW 0

FRW 1

FRW 1-4

FRW 133FRW 133FRW 1-5

FRW 144FRW 2-5FRW 2-6FRW 2

FRW 155

FRW 156FRW 166FRW 3

FRW 168 BFRW 188FRW 4 B

FRW 1810

FRW 0 ZZ

FRW 1 ZZ

FRW 1-4 ZZ

—FRW 133 ZZSFRW 1-5 ZZ

FRW 144 ZZFRW 2-5 ZZFRW 2-6 ZZSFRW 2 ZZ

FRW 155 ZZS

FRW 156 ZZSFRW 166 ZFRW 3 ZZ

FRW 168 BZZFRW 188 ZZFRW 4 BZZ

FRW 1810 ZZ

Inch series

FRW

Bore diameter

1.191 – 7.938 mm


d D D1 B B1 C C1 C2 C3 rmin.


Cr Cor Cr Cor



1.191

1.397

1.984

2.380

3.175

3.967

4.762

6.350

7.938

3.967

4.762

6.350

4.7624.7627.938

6.3507.9389.5259.525

7.938

7.9389.525

12.700

9.52512.70015.875

12.700

5.156

5.944

7.518

5.9445.9449.119

7.5189.119

10.71911.176

9.119

9.11910.71914.351

10.71913.89417.526

13.894

2.380

2.779

3.175

2.380—

3.571

3.1753.5713.5714.762

3.571

3.5713.9674.762

3.9673.9675.771

4.762

3.175

3.571

4.366

—3.1754.366

3.5714.3664.3664.762

3.967

3.9673.9675.771

3.9675.5585.771

4.762

1.588

1.984

2.380

1.588—

2.779

2.3802.7792.7793.967

2.779

2.7793.1753.967

3.1753.1754.978

3.967

2.380

2.779

3.571

—2.3803.571

2.7793.5713.5713.967

3.175

3.1753.1754.978

3.1754.7624.978

3.967

0.330

0.580

0.580

0.460―

0.580

0.5800.5800.5800.760

0.580

0.5800.5801.070

0.5800.5801.070

0.790

0.790

0.790

0.790

—0.7900.790

0.7900.7900.7900.760

0.910

0.9100.7901.070

0.9101.1401.070

0.790

0.1

0.1

0.1

0.10.10.15

0.10.10.150.3

0.1

0.10.10.3

0.10.150.3

0.15

138

231

310

188143550

283560640630

360

360710

1 300

4201 0801 610

540

35

66

108

6052

175

95179225218

149

149270485

204440660

276

14

24

32

191556

29576564

37

3773

133

43110164

55

3.5

6.5

11

65.5

18

9.5182322

15

152849

214568

28

110 000

90 000

67 000

80 00080 00060 000

67 00060 00053 00056 000

53 000

53 00050 00043 000

48 00040 00038 000

40 000

130 000

110 000

80 000

95 00095 00071 000

80 00067 00063 00067 000

63 000

63 00060 00053 000

56 00050 00045 000

48 000

Bearing numbers

Open Shielded


da db ra

min. max. max.

Mass(g)


FRW 0

FRW 1

FRW 1-4

FRW 133—

FRW 1-5

FRW 144FRW 2-5FRW 2-6FRW 2

FRW 155

FRW 156FRW 166FRW 3

FRW 168 BFRW 188FRW 4 B

FRW 1810

2.0

2.2

2.8

3.2—3.6

4.04.04.45.2

4.8

5.65.66.8

7.27.68.4

9.2

1.9

2.3

3.9

—3.04.1

3.94.34.64.8

5.5

5.55.96.5

7.07.48.4

9.0

0.1

0.1

0.1

0.10.10.15

0.10.10.150.3

0.1

0.10.10.3

0.10.150.3

0.15

0.14

0.24

0.59

0.17—

0.83

0.440.931.31.8

0.73

0.581.23.1

0.702.15.08

2.3

0.19

0.32

0.59

—0.220.93

0.470.931.41.7

0.79

0.631.23.2

0.792.54.98

2.1

Basicbearing




Open type

C

B

C2

r

r

φD φdφD1


C1

B1

C3

r

r

φD φdφD1φda

ra ra

φdb

0.1562

0.1875

0.2500

0.18750.18750.3125

0.25000.31250.37500.3750

0.3125

0.31250.37500.5000

0.37500.50000.6250

0.5000

0.203

0.234

0.296

0.2340.2340.359

0.2960.3590.4220.440

0.359

0.3590.4220.565

0.4220.5470.690

0.547

0.0469

0.0550

0.0781

0.0937

0.1250

0.1562

0.1875

0.2500

0.3125

0.1250

0.1406

0.1719

—0.12500.1719

0.14060.17190.17190.1875

0.1562

0.15620.15620.2272

0.15620.21880.2272

0.1875

0.0625

0.0781

0.0937

0.0625—

0.1094

0.09370.10940.10940.1562

0.1094

0.10940.12500.1562

0.12500.12500.1960

0.1562

0.0937

0.1094

0.1250

0.0937—

0.1406

0.12500.14060.14060.1875

0.1406

0.14060.15620.1875

0.15620.15620.2272

0.1875

0.0937

0.1094

0.1406

—0.09370.1406

0.10940.14060.14060.1562

0.1250

0.12500.12500.1960

0.12500.18750.1960

0.1562

0.013

0.023

0.023

0.018―

0.023

0.0230.0230.0230.030

0.023

0.0230.0230.042

0.0230.0230.042

0.031

0.031

0.031

0.031

―0.0310.031

0.0310.0310.0310.030

0.036

0.0360.0310.042

0.0360.0450.042

0.031

Deep groove ball bearingswith extended inner ring, flanged

48 49

Ball bearings for synchros

Inch series

SR · · X

Bore diameter

3.175 – 4.762 mm


d D B B1 rmin.


Cr Cor Cr Cor

Limiting speeds (mi n -1)

Grease OilOpen Open

ZS·ZZS ZS

3.175

4.762

9.52510.10010.414

10.10010.41412.700

12.70014.46322.225

———

——

2.779

—4.9784.978

2.7792.3802.380

2.7792.779

—

3.9674.9784.978

0.10.10.1

0.10.10.1

0.10.30.3

241264264

305305605

6051 1101 260

768787

119119216

216385495

252727

313162

62113128

8.09.09.0

121222

224050

53 00063 00063 000

53 00053 00050 000

50 00043 00043 000

63 00075 00075 000

63 00063 00060 000

60 00053 00053 000

Bearing numbers

Open Single shielded Double shielded


da db Da ra

min. max. max. max.

Mass(g)

approx.

———

——

SR 186X1

—SR 3X31SR 3X23

SR 2X52 ZSSR 144X100 ZSSR 174X5 ZS

SR 156X100 ZSSR 156X101 ZS

—

SR 186X2 ZSSR 3X31 ZSSR 3X23 ZS

SR 2X52 ZZSSR 144X100 ZZSSR 174X5 ZZS

SR 156X100 ZZSSR 156X101 ZZS

—

SR 186X2 ZZSSR 3X31 ZZSSR 3X23 ZZS

3.93.93.9

5.55.55.6

5.66.56.8

3.93.93.9

5.55.5―

5.96.58.4

8.79.39.6

9.39.6

11.9

11.912.920.6

0.10.10.1

0.10.10.1

0.10.30.3

1.01.21.2

1.01.11.8

2.64.0

13

Remark These bearings are made of stainless steel.

Open type

B

r

r

φD φd

Shielded typeZZS

B1

r

r

φD φd

rara

ra

φDa φda

ra

rara

φDa φd b

0.1250

0.1875

0.37500.39760.4100

0.39760.41000.5000

0.50000.56940.8750

———

——

0.1094

—0.19600.1960

0.10940.09370.0937

0.10940.1094

—

0.15620.19600.1960

50 51

Angular contact ball bearings

Extra-thin-section deep groove ball bearings

Metric series

700C

Bore diameter

4 – 9 mm

Metric series

SMT

Bore diameter

10 – 15 mm


d D B r r1

min. min.


Cr Cor Cr Cor


Grease Oil

4

5

6

7

8

9

16

16

1719

19

2224

24

5

5

66

6

78

7

0.3

0.3

0.30.3

0.3

0.30.3

0.3

0.15

0.15

0.150.15

0.15

0.150.15

0.15

1 700

1 700

2 0302 390

2 390

3 5503 600

3 600

660

660

7951 000

1 000

1 5401 600

1 600

174

174

204243

243

360365

365

67

66

81102

102

157164

164

53 000

53 000

50 00048 000

48 000

43 00040 000

40 000

71 000

71 000

67 00063 000

63 000

56 00053 000

53 000

Bearingnumbers


da Da ra

min. max. max.

Mass(g)

approx.

734C

725C

706C726C

707C

708C728C

709C

6.5

7.5

8.58.5

9.5

10.510.5

11.5

13.5

13.5

14.516.5

16.5

19.521.5

21.5

0.3

0.3

0.30.3

0.3

0.30.3

0.3

5.3

4.5

5.57.8

7.4

1216

14

Remarks 1. The tolerance classes for this type of bearing are classes 5 and 4.2. Please contact NSK regarding separable bearings or inch series bearings.


d D B rmin.


Cr Cor Cr Cor


Grease Oil

10

15

15

20

3

3.5

0.15

0.15

815

800

410

470

83

82

42

48

36 000

30 000

43 000

36 000

Bearingnumbers


da Da ra

min. max. max.

Mass(g)

approx.

SMT 1510

SMT 2015

11.2

16.2

13.8

18.8

0.15

0.15

1.4

2.2

Remarks 1. These bearings are made of stainless steel.2. The tolerance classes for this type of bearing are nomal and class 6.3. The radial internal clearance for this type of bearing is specified by ISO 5593 Rolling bearings-Radial internal clearance.

Br1

r

r

φD φd

Br

r

φD φd

rara

rara

φda φDa

rara

rara

φDa φda

53

Appendices

Page

Appendix Table 1 Conversion from SI (International Units)

system ...................................................... 54 – 55

Appendix Table 2 N – kgf Force conversion table ....................... 56

Appendix Table 3 Kg – 1b Mass conversion table ....................... 57

Appendix Table 4 °C – °F Temperature conversion table ........... 58

Appendix Table 5 Viscosity conversion table .............................. 59

Appendix Table 6 Inch-mm Dimension conversion table ............ 60

Appendix Table 7 Hardness conversion table ............................. 61

Appendix Table 8 Values of standard tolerance grades IT ... 62 – 63

Appendix Table 9 Physical and mechanical properties

of materials ...................................................... 64

5554

Appendix Table 1 Conversion from SI (International Units) System

Comparison of SI, CGS, and Engineering Units

Conversion Factors from SI Units

UnitSystem

Units

SI

Length Mass Time Temp. Accelera-tion

m kg s K m/s2

cm

m

g

kgf･s2/m

s

s

℃

℃

Gal

m/s2

dyn

kgf

dyn/cm2

kgf/m2

dyn/cm2

kgf/m2

erg

kgf・m

erg/s

kgf・m/s

Force

N

Stress

Pa

Pressure

Pa

Energy

J

Power

W

CGS System

EngineeringUnit System

ParameterSI Units Units other than SI Conversion Factors from

SI UnitsNames of Units Name of UnitsSymbols Symbols

Angle Radian

Length Meter

Area Square meter

Volume Cubic meter

Time

Frequency

Speed of Rotation

Speed

Acceleration

Mass

Force

Torque or Moment

Stress

Second

Hertz

Revolution per second

Meter per second

Meter per second per second

Kilogram

Newton

Newton・meter

Pascal

rad

m

m2

m3

s

Hz

s–1

m/s

m/s2

kg

N

N・m

Pa（N/m2）

DegreeMinuteSecond

MicronAngstrom

AreHectare

LiterDeciliter

MinuteHourDay

Cycle

Revolution per minute

Kilometer per hourKnot

Galg

Ton

Kilogram-forceTon-forceDyne

Kilogram-force meter

Kilogram-force per square centimeterKilogram-force per square millimeter

°′″

aha

l，Ldl，dL

minhd

s–1

rpm

km/hkn

Galg

t

kgftfdyn

kgf・m

kgf/cm2

kgf/mm2

180/π10 800/π648 000/π

106

1010

10–2

10–4

103

104

1/601/3 6001/86 400

1

60

3 600/1 0003 600/1 852

102

1/9.806 65

10–3

1/9.806 651/（9.806 65×103）105

1/9.806 65

1/（9.806 65×104）1/（9.806 65×106）

Note (1) The conversion from TK into θ°C is θ= T―273.15 but for a temperature difference, it is dT = dθ. However, dT and dθ representtemperature differences measured using the Kelvin and Celsius scales respectively.

Remarks The names and symbols in ( ) are equivalent to those directly above them or on their left.Example of conversion 1 N = 1/9.806 65 kgf

Prefixes Used In SI System

Multiples Prefix Symbols Multiples Prefix Symbols

1018

1015

1012

109

106

103

102

10

ExaPetaTera

GigaMegaKilo

HectoDeca

EPT

GMk

hda

10–1

10–2

10–3

10–6

10–9

10–12

10–15

10–18

DeciCentiMilli

MicroNanoPico

FemtoAto

dcm

p

np

fa

Conversion Factors from SI Units (Continued)

ParameterSI Units Units other than SI Conversion factors

from SI UnitsNames of Units Names of UnitsSymbols Units

Pressure Pascal(Newton per square meter)

Energy Joule(Newton・meter)

Work

Viscosity,Viscosity Index

Watt(Joule per second)

Pascal second

Pa（N/m2）

J（N·m）

W（J/s）

Pa·s

Kilogram-force per square meterWater ColumnMercury ColumnTorrBarAtmosphere

ErgCalorie (International)Kilogram-force meterKilowatt hourFrench horse power hour

Kilogram-force meter per secondKilocalorie per hourFrench horse power

Poise

kgf/m2

mH2OmmHgTorrbaratm

ergcal IT

kgf·mkW ·hPS··h

kgf·m/skcal/hPS

P

1/9.806 651/（9.806 65×103）760/（1.013 25×105）760/（1.013 25×10 5）10–5

1/（1.013 25×105）

107

1/4.186 81/9.806 651/（3.6×106）～～3.776 72×10–7

1/9.806 651/1.163～～1/735.498 8

10

Kinematic Viscosity,Kinematic Viscosity Index

Square meter per second m2/s StokesCentistokes

StcSt

104

106

Temperature Kelvin, Degree celsius K,℃ Degree ℃ (See Note (1))

Electric Current,Magnetomotive Force Ampere A Ampere A 1

Voltage,Electromotive Force Volt V (Watts per ampere) （W/A） 1

Magnetic FieldStrength Ampere per meter A/m Oersted Oe 4π/103

Magnetic FluxDensity

Tesla T GaussGamma

Gsγ

104

109

Electrical Resistance Ohm Ω (Volts per ampere) （V/A） 1

p

A°

5756

6768697071

7273747576

7778798081

8283848586

8788899091

9293949596

979899

3435363738

3940414243

4445464748

4950515253

5455565758

5960616263

646566

9.806619.61329.42039.22749.033

58.84068.64778.45388.26098.066

107.87117.68127.49137.29147.10

156.91166.71176.52186.33196.13

205.94215.75225.55235.36245.17

254.97264.78274.59284.39294.20

304.01313.81323.62

12345

6789

10

1112131415

1617181920

2122232425

2627282930

313233

Appendix Table 2 N - kgf Conversion Table

N

0.10200.20390.30590.40790.5099

0.61180.71380.81580.91771.0197

1.12171.22371.32561.42761.5296

1.63151.73351.83551.93752.0394

2.14142.24342.34532.44732.5493

2.65132.75322.85522.95723.0591

3.16113.26313.3651

kgf

1 N＝0.1019716 kgf1 kgf＝9.80665 N

N

333.43343.23353.04362.85372.65

382.46392.27402.07411.88421.69

431.49441.30451.11460.91470.72

480.53490.33500.14509.95519.75

529.56539.37549.17558.98568.79

578.59588.40598.21608.01617.82

627.63637.43647.24

3.46703.56903.67103.77293.8749

3.97694.07894.18084.28284.3848

4.48684.58874.69074.79274.8946

4.99665.09865.20065.30255.4045

5.50655.60845.71045.81245.9144

6.01636.11836.22036.32226.4242

6.52626.62826.7301

kgf N

657.05666.85676.66686.47696.27

706.08715.89725.69735.50745.31

755.11764.92774.73784.53794.34

804.15813.95823.76833.57843.37

853.18862.99872.79882.60892.41

902.21912.02921.83931.63941.44

951.25961.05970.86

6.83216.93417.03607.13807.2400

7.34207.44397.54597.64797.7498

7.85187.95388.05588.15778.2597

8.36178.46368.56568.66768.7696

8.87158.97359.07559.17749.2794

9.38149.48349.58539.68739.7893

9.89129.9932

10.095

kgf

For example, to convert 10 N into kgf, read the figure in the right kgfcolumn adjacent to the 10 in the center column in the 1st block. Thismeans that 10 N is 1.01997 kgf. To convert 10 kgf into N, read thefigure in the left N column of the same row, which indicates that theanswer is 98.066 N.

How to use this table

6768697071

7273747576

7778798081

8283848586

8788899091

9293949596

979899

3435363738

3940414243

4445464748

4950515253

5455565758

5960616263

646566

0.4540.9071.3611.8142.268

2.7223.1753.6294.0824.536

4.9905.4435.8976.3506.804

7.2577.7118.1658.6189.072

9.5259.979

10.43310.88611.340

11.79312.24712.70113.15413.608

14.06114.51514.969

12345

6789

10

1112131415

1617181920

2122232425

2627282930

313233

Appendix Table 3 kg–lb Conversion Table

kg

2.2054.4096.6148.818

11.023

13.22815.43217.63719.84222.046

24.25126.45528.66030.86533.069

35.27437.47939.68341.88844.092

46.29748.50250.70652.91155.116

57.32059.52561.72963.93466.139

68.34370.54872.753

lb

1 kg＝2.2046226 1b1 1b＝0.45359237 kg

kg

15.42215.87616.32916.78317.237

17.69018.14418.59719.05119.504

19.95820.41220.86521.31921.772

22.22622.68023.13323.58724.040

24.49424.94825.40125.85526.308

26.76227.21627.66928.12328.576

29.03029.48429.937

74.95777.16279.36681.57183.776

85.98088.18590.39092.59494.799

97.00399.208

101.41103.62105.82

108.03110.23112.44114.64116.84

119.05121.25123.46125.66127.87

130.07132.28134.48136.69138.89

141.10143.30145.51

lb kg

30.39130.84431.29831.75132.205

32.65933.11233.56634.01934.473

34.92735.38035.83436.28736.741

37.19537.64838.10238.55539.009

39.46339.91640.37040.82341.277

41.73042.18442.63843.09143.545

43.99844.45244.906

147.71149.91152.12154.32156.53

158.73160.94163.14165.35167.55

169.76171.96174.17176.37178.57

180.78182.98185.19187.39189.60

191.80194.01196.21198.42200.62

202.83205.03207.23209.44211.64

213.85216.05218.26

lb

For example, to convert 10 kg into lb, read the figure in the right lbcolumn adjacent to the 10 in the center column in the 1st block. Thismeans that 10 kg is 22.046 lb. To convert 10 lb into kg, read the figurein the left kg column of the same row, which indicates that theanswer is 4.536 kg.


5958

23456

789

1011

1213141516

1718192021

2223242526

2728293031

323334

3536373839

4041424344

4546474849

5055606570

7580859095

100120140160180

200250300

Appendix Table 4 ˚C - ˚F Conversion Table

˚C

–73.3–62.2–51.1–40.0–34.4

–28.9–23.3–17.8–17.2–16.7

–16.1–15.6–15.0–14.4–13.9

–13.3–12.8–12.2–11.7–11.1

–10.6–10.0– 9.4– 8.9– 8.3

– 7.8– 7.2– 6.7– 6.1– 5.6

– 5.0– 4.4– 3.9– 3.3– 2.8

– 2.2– 1.7– 1.1– 0.6

–148.0–112.0– 76.0– 40.0– 22.0

– 4.014.032.033.835.6

37.439.241.042.844.6

46.448.250.051.853.6

55.457.259.060.862.6

64.466.268.069.871.6

73.475.277.078.880.6

82.484.286.087.8

–100– 80– 60– 40– 30

– 20– 10

012

34567

89

101112

1314151617

1819202122

2324252627

28293031

˚F ˚C

0.00.61.11.72.2

2.83.33.94.45.0

5.66.16.77.27.8

8.38.99.4

10.010.6

11.111.712.212.813.3

13.914.415.015.616.1

16.717.217.818.318.9

19.420.020.621.1

89.691.493.295.096.8

98.6100.4102.2104.0105.8

107.6109.4111.2113.0114.8

116.6118.4120.2122.0123.8

125.6127.4129.2131.0132.8

134.6136.4138.2140.0141.8

143.6145.4147.2149.0150.8

152.6154.4156.2158.0

3233343536

3738394041

4243444546

4748495051

5253545556

5758596061

6263646566

67686970

˚F ˚C

21.722.222.823.323.9

24.425.025.626.126.7

27.227.828.328.929.4

30.030.631.131.732.2

32.833.333.934.435.0

35.636.136.737.237.8

38.338.939.440.040.6

41.141.742.242.8

159.8161.6163.4165.2167.0

168.8170.6172.4174.2176.0

177.8179.6181.4183.2185.0

186.8188.6190.4192.2194.0

195.8197.6199.4201.2203.0

204.8206.6208.4210.2212.0

213.8215.6217.4219.2221.0

222.8224.6226.4228.2

7172737475

7677787980

8182838485

8687888990

9192939495

96979899

100

101102103104105

106107108109

˚F ˚C

43.346.148.951.754.4

57.260.065.671.176.7

82.287.893.398.9

104.4

110.0115.6121.1148.9176.7

204232260288316

343371399427454

482510538593649

704760816871

230239248257266

275284302320338

356374392410428

446464482572662

752842932

10221112

12021292138214721562

16521742183220122192

2372255227322912

110115120125130

135140150160170

180190200210220

230240250300350

400450500550600

650700750800850

900950

1 0001 1001 200

1 3001 4001 5001 600

˚F

C＝（F－32）

F＝32＋ C

5―99―5

Appendix Table 5 Viscosity Conversion Table

32.636.039.142.345.5

48.752.055.458.862.3

65.969.673.477.281.1

85.189.293.397.5

102

106110115119123

128132137141145

150154159

32.836.339.442.645.8

49.052.455.859.262.7

66.470.173.977.781.7

85.789.894.098.2

102

107111115120124

129133138142146

150155160

30.833.335.938.541.1

43.746.349.152.155.1

58.261.464.768.071.5

75.078.682.185.889.5

93.397.1

101105109

112116120124128

132136140

31.233.736.539.141.7

44.347.050.052.956.0

59.162.365.669.172.6

76.179.783.687.491.3

95.198.9

103107111

115119123127131

135139143

1.141.221.311.401.48

1.561.651.751.841.93

2.022.122.222.322.43

2.542.642.762.872.98

3.103.223.343.463.58

3.703.823.954.074.20

4.324.454.57

KinematicViscositymm2/s

SayboltUniversalSUS (sec)

100 ˚F 210 ˚F 50 ˚C 100 ˚C

No.1 TypeRedwoodR (sec) Engler

E (degree)

Remarks 1 mm2/s＝1 cSt

163168172177181

186190195199204

208213218222227

231254277300323

346371394417440

464556649742834

9271 1591 391

164170173178183

187192196201205

210215219224228

233256279302326

349373397420443

467560653747840

9331 1671 400

144148153156160

164168172176180

184188193197201

205225245266286

306326347367387

408490571653734

8161 0201 224

147151155159164

168172176180185

189193197202206

210231252273294

315336357378399

420504588672757

8411 0511 241

4.704.834.965.085.21

5.345.475.595.725.85

5.986.116.246.376.50

6.637.247.908.559.21

9.8910.511.211.812.5

13.215.818.421.123.7

26.332.939.5

KinematicViscositymm2/s

SayboltUniversalSUS (sec)

100 ˚F 210 ˚F 50 ˚C 100 ˚C

No.1 TypeRedwoodR (sec) Engler

E (degree)

For example, to convert 38 ˚C into ˚F, read the figure in the right ˚Fcolumn adjacent to the 38 in the center column in the 2nd block. Thismeans that 38 ˚C is 100.4 ˚F. To convert 38 ˚F into ˚C, read the figurein the left ˚C column of the same row, which indicates that the answeris 3.3 ˚C.


6160

Appendix Table 7 Hardness Conversion Table (Reference)

RockwellC Scale

Hardness(1 471 N){150 kgf}

VickersHardness

Brinell Hardness

Standard Ball TungstenCarbide Ball

RockwellHardness

A Scale B Scale

Load 588.4 N{60 kgf}

BraleIndenter

Load 980.7 N{100 kgf}

1.588 mm Ball(1/16 in.)

940900865832800

772746720697674

653633613595577

560544528513498

484471458446434

423412402392382

372363354345336

327318310302294

286279272266260

254248243238

230222213204

196188180173166160

—————

—————

—————

—500487475464

451442432421409

400390381371362

353344336327319

311301294286279

271264258253247

243237231226

219212203194

187179171165158152

———

739722

705688670654634

615595577560543

525512496481469

455443432421409

400390381371362

353344336327319

311301294286279

271264258253247

243237231226

219212203194

187179171165158152

Shore Hardness

85.685.084.583.983.4

82.882.381.881.280.7

80.179.679.078.578.0

77.476.876.375.975.2

74.774.173.673.172.5

72.071.570.970.469.9

69.468.968.467.967.4

66.866.365.865.364.7

64.363.863.362.862.4

62.061.561.060.5

————

——————

———―—

—————

—————

—————

—————

—————

——

（109.0）（108.5）（108.0）

（107.5）（107.0）（106.0）（105.5）（104.5）

（104.0）（103.0）（102.5）（101.5）（101.0）

100.099.098.597.8

96.795.593.992.3

90.789.587.185.583.581.7

9795929188

8785838180

7876757472

7169686766

6463626058

5756555452

5150494847

4644434241

4140383837

36353534

33323129

282726252424

6867666564

6362616059

5857565554

5352515049

4847464544

4342414039

3837363534

3332313029

2827262524

23222120

（18）（16）（14）（12）

（10）（8）（6）（4）（2）（0）

Appendix Table 6 inch – mm Conversion Table1″＝25.4 mm

inch 0 1

Fraction Decimal

01/641/323/64

1/165/643/327/64

1/89/645/32

11/64

3/1613/64

7/3215/64

1/417/64

9/3219/64

5/1621/6411/3223/64

3/825/6413/3227/64

7/1629/6415/3231/64

1/233/6417/3235/64

9/1637/6419/3239/64

5/841/6421/3243/64

11/1645/6423/3247/64

3/449/6425/3251/64

13/1653/6427/3255/64

7/857/6429/3259/64

15/1661/6431/3263/64

0.0000000.0156250.0312500.046875

0.0625000.0781250.0937500.109375

0.1250000.1406250.1562500.171875

0.1875000.2031250.2187500.234375

0.2500000.2656250.2812500.296875

0.3125000.3281250.3437500.359375

0.3750000.3906250.4062500.421875

0.4375000.4531250.4687500.484375

0.5000000.5156250.5312500.546875

0.5625000.5781250.5937500.609375

0.6250000.6406250.6562500.671875

0.6875000.7031250.7187500.734375

0.7500000.7656250.7812500.796875

0.8125000.8281250.8437500.859375

0.8750000.8906250.9062500.921875

0.9375000.9531250.9687500.984375

0.0000.3970.7941.191

1.5881.9842.3812.778

3.1753.5723.9694.366

4.7625.1595.5565.953

6.3506.7477.1447.541

7.9388.3348.7319.128

9.5259.922

10.31910.716

11.11211.50911.90612.303

12.70013.09713.49413.891

14.28814.68415.08115.478

15.87516.27216.66917.066

17.46217.85918.25618.653

19.05019.44719.84420.241

20.63821.03421.43121.828

22.22522.62223.01923.416

23.81224.20924.60625.003

25.40025.79726.19426.591

26.98827.38427.78128.178

28.57528.97229.36929.766

30.16230.55930.95631.353

31.75032.14732.54432.941

33.33833.73434.13134.528

34.92535.32235.71936.116

36.51236.90937.30637.703

38.10038.49738.89439.291

39.68840.08440.48140.878

41.27541.67242.06942.466

42.86243.25943.65644.053

44.45044.84745.24445.641

46.03846.43446.83147.228

47.62548.02248.41948.816

49.21249.60950.00650.403

50.80051.19751.59451.991

52.38852.78453.18153.578

53.97554.37254.76955.166

55.56255.95956.35656.753

57.15057.54757.94458.341

58.73859.13459.53159.928

60.32560.72261.11961.516

61.91262.30962.70663.103

63.50063.89764.29464.691

65.08865.48465.88166.278

66.67567.07267.46967.866

68.26268.65969.05669.453

69.85070.24770.64471.041

71.43871.83472.23172.628

73.02573.42273.81974.216

74.61275.00975.40675.803

76.20076.59776.99477.391

77.78878.18478.58178.978

79.37579.77280.16980.566

80.96281.35981.75682.153

82.55082.94783.34483.741

84.13884.53484.93185.328

85.72586.12286.51986.916

87.31287.70988.10688.503

88.90089.29789.69490.091

90.48890.88491.28191.678

92.07592.47292.86993.266

93.66294.05994.45694.853

95.25095.64796.04496.441

96.83897.23497.63198.028

98.42598.82299.21999.616

100.012100.409100.806101.203

101.600101.997102.394102.791

103.188103.584103.981104.378

104.775105.172105.569105.966

106.362106.759107.156107.553

107.950108.347108.744109.141

109.538109.934110.331110.728

111.125111.522111.919112.316

112.712113.109113.506113.903

114.300114.697115.094115.491

115.888116.284116.681117.078

117.475117.872118.269118.666

119.062119.459119.856120.253

120.650121.047121.444121.841

122.238122.634123.031123.428

123.825124.222124.619125.016

125.412125.809126.206126.603

127.000127.397127.794128.191

128.588128.984129.381129.778

130.175130.572130.969131.366

131.762132.159132.556132.953

133.350133.747134.144134.541

134.938135.334135.731136.128

136.525136.922137.319137.716

138.112138.509138.906139.303

139.700140.097140.494140.891

141.288141.684142.081142.478

142.875143.272143.669144.066

144.462144.859145.256145.653

146.050146.447146.844147.241

147.638148.034148.431148.828

149.225149.622150.019150.416

150.812151.209151.606152.003

152.400152.797153.194153.591

153.988154.384154.781155.178

155.575155.972156.369156.766

157.162157.559157.956158.353

158.750159.147159.544159.941

160.338160.734161.131161.528

161.925162.322162.719163.116

163.512163.909164.306164.703

165.100165.497165.894166.291

166.688167.084167.481167.878

168.275168.672169.069169.466

169.862170.259170.656171.053

171.450171.847172.244172.641

173.038173.434173.831174.228

174.625175.022175.419175.816

176.212176.609177.006177.403

2 3 4 5 6 7 8 9 10

177.800178.197178.594178.991

179.388179.784180.181180.578

180.975181.372181.769182.166

182.562182.959183.356183.753

184.150184.547184.944185.341

185.738186.134186.531186.928

187.325187.722188.119188.516

188.912189.309189.706190.103

190.500190.897191.294191.691

192.088192.484192.881193.278

193.675194.072194.469194.866

195.262195.659196.056196.453

196.850197.247197.644198.041

198.438198.834199.231199.628

200.025200.422200.819201.216

201.612202.009202.406202.803

203.200203.597203.994204.391

204.788205.184205.581205.978

206.375206.772207.169207.566

207.962208.359208.756209.153

209.550209.947210.344210.741

211.138211.534211.931212.328

212.725213.122213.519213.916

214.312214.709215.106215.503

215.900216.297216.694217.091

217.488217.884218.281218.678

219.075219.472219.869220.266

220.662221.059221.456221.853

222.250222.647223.044223.441

223.838224.234224.631225.028

225.425225.822226.219226.616

227.012227.409227.806228.203

228.600228.997229.394229.791

230.188230.584230.981231.378

231.775232.172232.569232.966

233.362233.759234.156234.553

234.950235.347235.744236.141

236.538236.934237.331237.728

238.125238.522238.919239.316

239.712240.109240.506240.903

241.300241.697242.094242.491

242.888243.284243.681244.078

244.475244.872245.269245.666

246.062246.459246.856247.253

247.650248.047248.444248.841

249.238249.634250.031250.428

250.825251.222251.619252.016

252.412252.809253.206253.603

254.000254.397254.794255.191

255.588255.984256.381256.778

257.175257.572257.969258.366

258.762259.159259.556259.953

260.350260.747261.144261.541

261.938262.334262.731263.128

263.525263.922264.319264.716

265.112265.509265.906266.303

266.700267.097267.494267.891

268.288268.684269.081269.478

269.875270.272270.669271.066

271.462271.859272.256272.653

273.050273.447273.844274.241

274.638275.034275.431275.828

276.225276.622277.019277.416

277.812278.209278.606279.003

mm

62 63

Appendix Table 8 Values of Standard Tolerance Grades IT

Basic Size(mm)

Standard Grades

over incl. Tolerances (pm) Tolerances (mm)

IT1

—

3

6

10

18

30

50

80

120

180

250

315

400

500

630

800

1 000

1 250

1 600

2 000

2 500

3

6

10

18

30

50

80

120

180

250

315

400

500

630

800

1 000

1 250

1 600

2 000

2 500

3 150

0.8

1

1

1.2

1.5

1.5

2

2.5

3.5

4.5

6

7

8

9

10

11

13

15

18

22

26

1.2

1.5

1.5

2

2.5

2.5

3

4

5

7

8

9

10

11

13

15

18

21

25

30

36

2

2.5

2.5

3

4

4

5

6

8

10

12

13

15

16

18

21

24

29

35

41

50

3

4

4

5

6

7

8

10

12

14

16

18

20

22

25

28

33

39

46

55

68

4

5

6

8

9

11

13

15

18

20

23

25

27

32

36

40

47

55

65

78

96

6

8

9

11

13

16

19

22

25

29

32

36

40

44

50

56

66

78

92

110

135

10

12

15

18

21

25

30

35

40

46

52

57

63

70

80

90

105

125

150

175

210

14

18

22

27

33

39

46

54

63

72

81

89

97

110

125

140

165

195

230

280

330

25

30

36

43

52

62

74

87

100

115

130

140

155

175

200

230

260

310

370

440

540

40

48

58

70

84

100

120

140

160

185

210

230

250

280

320

360

420

500

600

700

860

60

75

90

110

130

160

190

220

250

290

320

360

400

440

500

560

660

780

920

1 100

1 350

0.10

0.12

0.15

0.18

0.21

0.25

0.30

0.35

0.40

0.46

0.52

0.57

0.63

0.70

0.80

0.90

1.05

1.25

1.50

1.75

2.10

0.14

0.18

0.22

0.27

0.33

0.39

0.46

0.54

0.63

0.72

0.81

0.89

0.97

1.10

1.25

1.40

1.65

1.95

2.30

2.80

3.30

0.25

0.30

0.36

0.43

0.52

0.62

0.74

0.87

1.00

1.15

1.30

1.40

1.55

1.75

2.00

2.30

2.60

3.10

3.70

4.40

5.40

0.40

0.48

0.58

0.70

0.84

1.00

1.20

1.40

1.60

1.85

2.10

2.30

2.50

2.80

3.20

3.60

4.20

5.00

6.00

7.00

8.60

0.60

0.75

0.90

1.10

1.30

1.60

1.90

2.20

2.50

2.90

3.20

3.60

4.00

4.40

5.00

5.60

6.60

7.80

9.20

11.00

13.50

1.00

1.20

1.50

1.80

2.10

2.50

3.00

3.50

4.00

4.60

5.20

5.70

6.30

7.00

8.00

9.00

10.50

12.50

15.00

17.50

21.00

1.40

1.80

2.20

2.70

3.30

3.90

4.60

5.40

6.30

7.20

8.10

8.90

9.70

11.00

12.50

14.00

16.50

19.50

23.00

28.00

33.00

IT2 IT3 IT4 IT5 IT6 IT7 IT8 IT9 IT10 IT11 IT12 IT13 IT14 IT15 IT16 IT17 IT18

Basic Size(mm)

over incl.

—

3

6

10

18

30

50

80

120

180

250

315

400

500

630

800

1 000

1 250

1 600

2 000

2 500

3

6

10

18

30

50

80

120

180

250

315

400

500

630

800

1 000

1 250

1 600

2 000

2 500

3 150

Remarks 1. Standard tolerance grades IT14 to IT18 shall not be used for basic sizes less than or equal to 1 mm.2. Values for standard tolerance grades IT1 to IT5 for basic sizes over 500 mm are included for experimental use.

6564

Bearing Conversion Tables

Page

Conversion Table 1 Deep groove ball bearings open type

(Metric series) ................................................... 66

Conversion Table 2 Deep groove ball bearings shielded type

(Metric series) ................................................... 67

Conversion Table 3 Deep groove ball bearings with flanged

outer ring open type (Metric series) ................ 68


outer ring shielded type (Metric series) .......... 69

Conversion Table 5 Deep groove ball bearings open type

(Inch series) ...................................................... 70

Conversion Table 6 Deep groove ball bearings shielded type

(Inch series) ....................................................... 70


outer ring open type (Inch series) ................... 71


outer ring shielded type (Inch series) ............. 71

Conversion Table 9 Deep groove ball bearings with extended

inner ring open type (Inch series) ................... 72


inner ring shielded type (Inch series) ............. 72


inner ring, flanged open type (Inch series) .... 73


inner ring, flanged shielded type

(Inch series) ...................................................... 73

Conversion Table 13 Ball bearings for synchros (Inch series).......... 74

Appendix Table 9 Physical and Mechanical Properties of Materials

Materials

Bearing Steel (hardened)

Martensitic Stainless SteelSUS 440C

Mild (C=0.12 to 0.20 %)Steel

Hard (C=0.3 to 0.5 %)Steel

Austenitic Stainless SteelSUS 304

Cast Iron

Gray IronFC200

Spheroidalgraphite IronFCD400

Aluminum

Zinc

Copper

(Annealed)Brass

(Machined)

SpecificGravity

7.83

7.68

7.86

7.84

8.03

7.3

7.0

2.69

7.14

8.93

8.5

Coefficientof Linear

Expansion(0 to 100 ˚C)

(K–1)

Hardness(Brinell)

Modulusof DirectElasticity(MPa)

{kgf/mm2}

Tensile Strength(MPa)

{kgf/mm2}

Yield Point(MPa)

{kgf/mm2}

Elongation(%)

12.5×10–6

10.1×10–6

11.6×10–6

11.3×10–6

16.3×10–6

10.4×10–6

11.7×10–6

23.7×10–6

31×10–6

16.2×10–6

19.1×10–6

650 to 740

580

100 to 130

160 to 200

150

223

Less than201

15 to 26

30 to 60

50

45

85 to 130

208 000{21 200}

200 000{20 400}

206 000{21 000}

206 000{21 000}

193 000{19 700}

98 100{10 000}

70 600{7 200}

92 200{9 400}

123 000{12 500}

103 000{10 500}

1 570 to 1 960{160 to 200}

1 960{200}

373 to 471{38 to 48}

539 to 686{55 to 70}

588{60}

More than200{20}

More than400{41}

78{8}

147{15}

196{20}

294 to 343{30 to 35}

363 to 539{37 to 55}

—

1 860{190}

216 to 294{22 to 30}

333 to 451{34 to 46}

245{25}

—

—

34{3.5}

—

69{7}

—

—

—

24 to 36

14 to 26

60

—

More than12

35

30 to 40

15 to 20

65 to 75

15 to 50

Remarks The hardness of hardened bearing steel and martensitic stainless steel is usually expressed using the Rockwell C Scale,but for comparison, it is converted into Brinell hardness.

6766

1

1.2

1.5

2

2.5

3

4

5

6

7

8

9

NSK ADR FAG GRW RMB BARDEN MPB NMB NTN

681MR31691

MR41X

681X691X601X

682MR52B692

MR62MR72602

682X692XMR82X602X

MR63683AMR83

693MR93603

623633

MR74MR84684A

MR104B694604

624634

MR85MR95MR105

685695605

625635

MR106MR126686A

696606626636

MR117MR137687

697607627637

MR128MR148688A

698608628638

689699609629639

AX1——

—

AX1.5619/1.5

—

BX2—

AX2

———

AX2.5X2.5

—60/2.5

617/3AX3X3

619/3——

623—

617/4—AX4

X4AY4604

624634

617/5——

X5AY5

—

625635

617/6X6AX6

AY6—

626—

617/7—

AX7

AY7607627

—

617/8—

X8

AY8608

——

X9AY9609629

—

———

—

—MR69/1.5

—

MR682—

MR619/2

———

———

MR60/2.5

—MR618/3

—

———

MR623—

——

MR618/4

———

MR624MR634

———

MR618/5——

MR625MR635

——

MR618/6

——

MR626—

——

618/7

—MR607MR627

—

——

MR618/8

—MR608

——

——

609MR629

—

681—

691

—

68/1.569/1.5

—

682—

692

———

68/2.569/2.5

—60/2.5

—683693/003

693——

623—

——

684

—694604

624634

———

685695605

625635

——

686

696—

626—

——

687

697607627

—

——

688

698608

——

689699609629

—

UL103——

—

UL154R1550

—

UL205—

R2060

———

UL256——

R2580

—UL307

—

———

R3100—

——

UL409

———

R4130R4160

———

UL511——

R5160R5190

——

UL613

——

U6190—

——

UL714

——

R7220—

——

UL816

—R8220

——

UL917—

609——

———

—

—19M1-5Y1

—

——

19M2Y1

———

18M2-519M2-5Y1

——

———

———

2M3Y1—

———

———

2M434

———

———

34-535

———

——

36—

———

——

37—

———

19M838

——

—19M9

—39

—

———

—

—EL1.5C

—

UL20C—

EL2C

———

————

—UL30C

—

———

EL-3R—

——

UL40C

———

EL4R—

———

UL50C——

EL5R—

——

UL60C

——

EL6R—

——

UL70C

—EL7R

——

———

—EL8R

——

—————

L-310L-310W51R-410

R-412

R-415R-515R-615

L-520L-520W02R-620

R-620W52R-720Y52R-720

L-625R-725R-825Y52R-825

L-630L-730R-830Y52

R-830R-930Y52R-930

R-1030—

L-740L-840L-940

L-1040R-1140R-1240

R-1340R-1640

L-850L-950L-1050

L-1150R-1350R-1450

R-1650R-1950

L-1060L-1260L-1360

R-1560R-1760R-1960

—

L-1170L-1370L-1470

—R-1970R-2270

—

L-1280L-1480L-1680

R-1980R-2280

——

L-1790L-2090

———

681—

691

BC1.2-4

68/1.569/1.560/1.5

682BC2-5692

BC2-6BC2-7602

68/2.569/2.5BC2.5-860/2.5

673683BC3-8

693BC3-9603

623633

674BC4-8684

BC4-10694604

624634

675BC5-9BC5-10

685695605

625635

676BC6-12686

696606626636

677BC7-13687

697607627637

678BC8-14688

698608628638

689699609629639

0.0394

0.0472

0.0591

0.0787

0.0984

0.1181

0.1575

0.1969

0.2362

0.2756

0.3150

0.3543

Conversion Table 1Deep groove ball bearingsOpen type (Metric series)

Conversion Table 2Deep groove ball bearingsShielded type (Metric series)

Bore diameter d

mm inch

In case ofstainless steel

————— hS ————— W ————— S ————— S ————— ————— X S ————— S ————— SS ————— F ——————

1.5

2

2.5

3

4

5

6

7

8

9


681XZZ691XZZ601XZZS

682ZZMR52BZZ692ZZ

MR62ZZMR72ZZ602ZZ

682XZZ692XZZ602XZZ

MR63ZZ683AZZ693ZZ

MR93ZZ623ZZ633ZZ

MR74ZZMR84ZZ684AZZ

MR104BZZ694ZZ604ZZ

624ZZ634ZZ1

MR85ZZMR95ZZ1MR105ZZ

685ZZ695ZZ605ZZ

625ZZ1635ZZ1

MR106ZZ1MR126ZZ686AZZ

696ZZ1606ZZ626ZZ1636ZZ

MR117ZZMR137ZZ687ZZ1

697ZZ1607ZZ1627ZZ637ZZ

MR128ZZ1MR148ZZ688AZZ1

698ZZ608ZZ628ZZ638ZZ

689ZZ1699ZZ1609ZZ629ZZ639ZZ

AX1.5ZZX1.5ZZ

—

BX2ZZ—

AX2ZZ

———

AX2.5ZZ——

—AX3ZZ

—

—623ZZ

—

——

638/4ZZ

X4ZZAY4ZZ604ZZ

624ZZ634ZZ

———

638/5ZZAY5ZZ

—

625ZZ635ZZ

—X6ZZ628/6ZZ

ZY6ZZ—

626ZZ—

——

AX7ZZ

AY7ZZ607ZZ627ZZ

—

637/8ZZ—

X8ZZ

AY8ZZ608ZZ

——

X9ZZAY9ZZ609ZZ629ZZ

—

———

———

———

———

———

—623.27

—

———

———

624.2ZMR634.27

———

———

625.2ZMR635.2Z

———

MR626.2Z———

———

—607.2ZMR627.2Z

—

———

—MR608.2Z

——

——

609.22MR629.2Z

—

68/1.5-2Z69/1.5-2Z

—

682-2Z——

———

68/2.5-2Z69/2.5-2Z

—

—683-2Z693-2Z

—623-2Z

—

——

684-2Z

—694-2Z604-2Z

624-2Z634-2Z

———

685-2Z695-2Z605-2Z

625-2Z635-2Z

——

686-2Z

696-2Z—

626-2Z—

——

687-2Z

697-2Z607-2Z627-2Z

—

———

698-2Z608-2Z

——

—699-2Z609-2Z629-2Z

—

ULZ154——

ULZ205——

———

ULZ256——

—

ULZ307——

RF310—

——

ULZ409

———

RF413RV416

———

ULZ511——

RV516RV519

——

ULZ613

——

RV619—

——

ULZ714

——

RV722—

——

ULZ816

—RV822

——

ULZ917————

———

38M2SS——

———

38M2-5SS——

—38M3SS

—

—2M3SSY1

—

——

38M455

———

2M4SS34SS

———

———

34-5SS35SS

———

——

36SS—

———

——

37SS—

———

19M8SS38SS

——

—19M9SS

—39SS

—

UL15CHH——

UL20CHH——

———

———

—UL30CHH

—

—EL3RHH

—

——

UL40CHH

———

EL4RHH34RHH

———

UL50CHH——

EL5RHH—

——

UL60CHH

——

EL6RHH—

——

UL70CH

—EL7RHH

——

———

—EL8RHH

——

—————

L-415ZZR-515ZZR-615ZZ

L-520ZZL-520ZZW52R-620ZZ

R-620ZZY52R-720ZZY03R-720ZZ

L-625ZZR-725ZZR-825ZZ

L-630ZZL-730ZZR-830ZZ

R-930ZZY04R-1030ZZ

—

L-740X2ZZL-840ZZL-940ZZ

L-1040ZZR-1140ZZR-1240ZZ

R-1340ZZR-1640ZZ

L-850ZZL-950X2ZZL-1050ZZ

L-1150ZZR-1350ZZR-1450ZZ

R-1650ZZR-1950ZZ

L-1060ZZL-1260ZZL-1360ZZ

R-1560ZZR-1760ZZR-1960ZZ

—

L-1170ZZL-1370ZZL-1470ZZ

—R-1970ZZR-2270ZZ

—

L-1280ZZL-1480ZZL-1680ZZ

R-1980ZZR-2280ZZ

——

L-1790ZZL-2090ZZ

———

W68/1.5ZZAW69/1.5ZZAW60/1.5ZZA

W682ZZAWBC2-5ZZAW692ZZA

—WBC2-7ZZAW602ZZA

W68/2.5ZZAW69/2.5ZZAW60/2.5ZZA

WA673ZZAW683ZZAW693ZZA

WBC3-9ZZA623ZZ633ZZ

WA674ZZAWBC4-8ZZAW684ZZA

WBC4-10ZZA694ZZ604ZZ

624ZZ634ZZ

WA675ZZAWBC5-9ZZAWBC5-10ZZA

W685ZZ695ZZ605ZZ

625ZZ635ZZ

WA676ZZAWBC6-12ZZAW686ZZ


WA677ZZAWBC7-13ZZAW687ZZ


W678ZZAWBC8-14ZZW688ZZ


W689ZZ699ZZ609ZZ629ZZ639ZZ

0.0591

0.0787

0.0984

0.1181

0.1575

0.1969

0.2362

0.2756

0.3150

0.3543


————— hS ————— W————— S ————— S ————— —————X S ————— S ————— SS ————— F ——————

Conversion

Bore diameter d

mm inch

6968

————— h <None>S ————— W ————— S —————— —————— X S —————— S —————— SS —————— F ——————

NSK ADR GRW RMB BARDEN MPB NMB NTN

F681F691

MF41X

F681XF691XF601X

F682MF52BF692

MF62MF72F602

F682XF692XMF82XF602X

MF63F683AMF83

F693MF93F603

F623

MF74MF84F684A

MF104BF694F604

F624F634

MF85MF95MF105

F685F695F605

F625F635

MF106MF126F686A

F696F606F626

MF117MF137F687

F697F607F627

MF128MF148F688A

F698F608

F689F699

1

1.2

1.5

2

2.5

3

4

5

6

7

8

9

——

—

FAX1.5F619/1.5

—

FBX2—

FAX2

———

FAX2.5FX2.5

——

—FAX3

—

FX3——

F623

——

FAX4

———

F624—

———

FX5——

——

——

FAX6

———

——

FAX7

—F607

—

——

FX8

—F608

FX9—

——

—

F68/1.5F69/1.5

—

F682—

F692

———

F68/2.5F69/2.5

——

—F683

—

F693——

F623

——

F684

—F694

—

F624F634

———

F685F695F605

F625F635

——

F686

F696—

F626

——

F687

F697F607

—

——

F688

F698F608

F689—

——

—

ULK154——

ULK205—

RK2060

———

ULK256——

RK2580

—ULK307

—

———

RK3100

——

ULK409

———

——

———

ULK511——

——

———

———

——

ULK714

———

——

ULK816

——

——

——

—

—F19M1-5Y1

—

F682—

F692

———

F68/2.5F19M2-5Y1

——

—F683

—

F693——

F623

——

F684

—F694

—

F624F634

———

F685F695

—

F625F635

——

F686

F696—

F626

——

F687

F697F607

—

——

F688

F698—

——

——

—

———

UL20FC——

———

————

—UL30FC

—

———

—

——

UL40FC

———

——

———

UL50FC——

——

——

UL60FC

———

——

UL70FC

———

———

——

——

LF-310RF-410

RF-412

LF-415RF-515RF-615

LF-520—

RF-620

RF-620W52RF-720Y52RF-720

LF-625RF-725RF-825Y52RF-825

LF-630LF-730RF-830Y52

RF-830RF-930Y52RF-930

RF-1030

LF-740LF-840LF-940

LF-1040RF-1140RF-1240

RF-1340RF-1640

LF-850LF-950LF-1050

LF-1150RF-1350RF-1450

RF-1650RF-1950

LF-1060LF-1260LF-1360

RF-1560RF-1760RF-1960

LF-1170LF-1370LF-1470

——

RF-2270

LF-1280LF-1480LF-1680

RF-1980RF-2280

LF-1790—

FL681FL691

FLBC1.2-4

FL68/1.5FL69/1.5EL60/1.5

FL682—

FL692

FLBC2-6—

FL602

FL68/2.5FL69/2.5FLBC2.5-8FL60/2.5

FL673FL683FLBC3-8

FL693FLBC3-9FL603

FL623

FL674FLBC4-8FL684

FLBC4-10FL694FL604

FL624—

FL675FLBC5-9FLBC5-10

FL685FL695FL605

FL625—

FL676FLBC6-12FL686

FL696FL606FL626

FL677FLBC7-13FL687

FL697——

FL678FLBC8-14FL688

FL698FL608

FL689—

0.0394

0.0472

0.0591

0.0787

0.0984

0.1181

0.1575

0.1969

0.2362

0.2756

0.3150

0.3543

ConversionConversion Table 3Deep groove ball bearings with flanged outer ringOpen type (Metric series)


————— hS ————— W ————— S —————— —————— X S —————— S —————— SS —————— F ——————

NSK ADR GRW RMB BARDEN MPB NMB NTN

F691XZZF601XZZ

F682ZZMF52BZZF692ZZMF72ZZF602ZZ

F682XZZF692XZZF602XZZ

MF63ZZF683AZZF693ZZ

MF93ZZF623ZZ

MF74ZZMF84ZZF684AZZ

MF104BZZF694ZZF604ZZ

F624ZZF634ZZ1

MF85ZZMF95ZZ1MF105ZZ

F685ZZF695ZZF605ZZ

F625ZZ1F635ZZ1

MF106ZZ1MF126ZZF686AZZ

F696ZZ1F606ZZF626ZZ1

MF117ZZMF137ZZF687ZZ1

F697ZZ1F607ZZ1F627ZZ

MF128ZZ1MF148ZZF688AZZ1

F698ZZF608ZZ

F689ZZ1F699ZZ1

1.5

2

2.5

3

4

5

6

7

8

9

FX1.5ZZ—

FBX2ZZ—

FAX2ZZ——

FAX2.5ZZFX2.5ZZ

—

—FAX3ZZFX3ZZ

—F623ZZ

——

F638/4ZZ

———

F624ZZ—

———

F638/5ZZ——

——

——

F628/6ZZ

———

——

FAX7ZZ

—F607ZZ

—

———

—F608ZZ

——

F69/1.5-2Z—

F682-2Z————

F68/2.5-2ZF69/2.5-2Z

—

—F683-2ZF693-2Z

—F623-2Z

——

F684-2Z

—F694-2Z

—

F624-2ZF634-2Z

———

F685-2ZF695-2ZF605-2Z

F625-2ZF635-2Z

——

F686-2Z

F696-2Z—

F626-27

——

F687-2Z

F697-2ZF607-2ZF627-2Z

———

F698-2ZF608-ZZ

——

——

ULKZ205————

ULKZ256——

—ULKZ307RKF308

—RKF310

——

ULKZ409

———

——

———

ULKZ511——

——

——

ULKZ613

———

——

ULKZ714

———

———

——

——

——

F682SS—

F692SS——

F68/2.5SSF69/2.5SS

—

—F683SS

—

—F623SS

——

F684SS

—F694SS

—

F624SSF634SS

———

F685SSF695SS

—

F625SSF635SS

——

F686SS

F696SS—

F626SS

——

F687SS

F697SSF607SSF627SS

——

F688SS

F698SSF608SS

F689SS—

——

UL20FCHH————

———

—UL30FCHH

—

——

——

UL40FCHH

———

——

———

UL50FCHH——

——

——

UL60FCHH

———

——

UL70FCHH

———

———

——

——

RF-515ZZRF-615ZZ

LF-520ZZ—

RF-620ZZRF-720ZZY03RF-720ZZ

LF-625ZZRF-725ZZRF-825ZZ

FL-630ZZLF-730ZZRF-830ZZ

RF-930ZZY04RF-1030ZZ

LF-740ZZLF-840ZZLF-940ZZ


RF-1340ZZRF-1640ZZ



RF-1650ZZRF-1950ZZ

LF-1060ZZUF-1260ZZLF-1360ZZ

RF-1560ZZRF-1760ZZ

—


——

RF-2270ZZ

LF-1280ZZUF-1480ZZUF-1680ZZ

—RF-2280ZZ

LF-1790ZZ—

FLW69/1.5ZZAFLW60/1.5ZZA

FLW682ZZA—

FLW692ZZAFLWBC2-7ZZAFLW602ZZA

FLW68/2.5ZZAFLW69/2.5ZZAFLW60/2.5ZZA

FLWA673ZZAFLW683ZZAFLW693ZZA

FLWBC3-9ZZAFL623ZZA

FLWA674ZZAFLWBC4-8ZZAFLW684ZZA

FLAWBC4-10ZZAFL694ZZAFL604ZZ

FL624ZZFL634ZZ

FLWA675ZZAFLWBC5-9ZZAFLAWBC5-10ZZA

FLW685ZZAFL695ZZFL605ZZ

FL625ZZFL635ZZ

FLWA676ZZAFLAWBC6-12ZZAFLW686ZZA

FL696ZZFL606ZZFL626ZZ

FLWA677ZZAFLAWBC7-13ZZAFLW687ZZA

FL697ZZFL607ZZFL627ZZ

FLAW678ZZAFLWBC8-14ZZAFLW688ZZ

FL698ZZFL608ZZ

FLW689ZZFL699ZZ

0.591

0.0787

0.0984

0.1181

0.1575

0.1969

0.2362

0.2756

0.3150

0.3543


Conversion Table 4Deep groove ball bearings with flanged outer ringShielded type (Metric series)

Bore diameter d

mm inch

Bore diameter d

mm inch

7170

S ————— W ————— S ————— S ————— ————— X S ————— S ————— F —————— SS —————In case ofstainless steel

R0ZZ

R1ZZ

R1-4ZZ

R133ZZSR1-5ZZ

R144ZZR2-5ZZR2-6ZZS

R2ZZR2AZZ

R155ZZS

R156ZZSR166ZZR3ZZ

R168ZZR188ZZR4BZZR4AAZZ

R1810ZZ

R6ZZ

1.016

1.191

1.397

1.984

2.380

3.175

3.967

4.762

6.350

7.938

9.525


R09

R0

R1

R1-4

R133R1-5

R144R2-5R2-6

R2R2A

R155

R156R166R3

R168R188R4BR4AA

R1810

R6

R09

X3/64

R1

X5/64

AX3/32X3/32

AX1/8X1/8

—

R2R2A

X5/32

AX3/16X3/16Y3/16

X1/4R188Y1/4R4A

—

Y3/8

R0308

R0310

R0412

R0516

R0612R620

R0816R820R824

R2R2A

R1020

R1220R1224R3

R1624R1632R4R4A

R2032

R6

1016

1191

1397

BR5/64

2380BR3/32

3175BR1/8ABR1/8A/6

BR1/8BBR1/8B/083

3967

4763A4763BBR3/16

6350A6350BBR1/4ABR1/4

7938

BR3/8

UL1304

UL1505

R1706

R2508

UL3006R3010

UL4008R4010

—

R4012—

UL5010

UL6010UL6012R6016

UL8012UL8016R8020

—

—

—

—

R0

R1

R1-4

R133R1-5

R144R2-5R2-6

R2R2A

R155

R156R166R3

R168R188R4R4A

R1810

R6

2C

21/2C

3C

4C

3332C5C

418C518C618C

R2CR2AC

5532C

5632C6316CR3C

614C814CR4CR4AR

8516C

R6R

R1-2

RI-21/2

RI-3

RI-4

RI-3332RI-5

RI-418RI-518RI-618

R-2—

RI-5532

RI-5632RI-6632R-3

RI-614RI-814R-4RI-1214

RI-8516

RI-1438

R01

R0

R1

R1-4

R133R1-5

R144R2-5R2-6

R2RA2

R155

R156R166R3

R168R188R4

—

—

—

0.0400

0.0469

0.0550

0.0781

0.0937

0.1250

0.1562

0.1875

0.2500

0.3125

0.3750

Conversion Table 5Deep groove ball bearingsOpen type (Inch series)


S ————— W ————— S ————— S ————— ————— X S ————— S ————— SS ————— F ——————


X3/64ZZ

R1ZZ

X5/64ZZ

AX3/32ZZX3/32ZZ

AX1/8ZZX1/8ZZ

—

R2ZZR2AZZ

X5/32ZZ

AX3/16ZZX3/16ZZY3/16ZZ

X1/4ZZR188ZZY1/4ZZR4AZZ

—

Y3/8ZZ

R0310.2Z

R0412.2Z

R0516.2Z

R0612.2ZR620.2Z

R0816.2ZR820.2ZR824.2Z

R2.2ZR2A.2Z

R1020.2Z

R1220.2ZR1224.2ZR3.2Z

R1624.2ZR1632.2ZR4.2ZR4A.2Z

R2032.2Z

R6.2Z

1191-2Z

1397-2Z

BR5/64-2Z

2380-2ZBR3/32ZZ

3175-2ZBR1/8A-2ZBR1/8A/6-2Z

BR1/8B-2ZBR1/8B/083-2Z

3967-2Z

4763A-2Z4763B-2ZBR3/16-2Z

6350A-2Z6350B-2ZBR1/4A-2ZBR1/4-2Z

7938-2Z

BR3/8-2Z

ULZ1505

RF1706

RF2508

ULZ3006RF3010

ULZ4008RF4010

—

RF4012—

ULZ5010

ULZ6010ULZ6012RF6016

ULZ8012ULZ8016RF8020

—

—

—

R0SS

R1S

R1-4SS

R133SSR1-5SS

R144SSR2-5SSR2-6SS

R2SSR2ASS

R155SS

R156SSR166SSR3SS

R168SSR188SSR4SSR4ASS

R1810SS

R6SS

21/2CHH

3CHH

4CHH

3332CHH5CHH

418CHH518CHH618CHH

R2CHHR2ACHH

5532CHH

5632CHH6316CHHR3CHH

614CHH814CHHR4CHHR4ARHH

8516CHH

R6RHH

RI-21/2ZZ

RI-3ZZ

RI-4ZZ

RI-3332ZZRI-5ZZ

RI-418ZZRI-518ZZRI-618ZZ

R-2ZZ—

RI-5532ZZ

RI-5632ZZRI-6632ZZR-3ZZ

RI-614ZZRI-814ZZR-4ZZRI-1214ZZ

RI-8516ZZ

RI-1438ZZ

RA0ZZA

RA1ZZ1

RA1-4ZZ1

RA133ZZARA1-5ZZA

RA144ZZARA2-5ZZARA2-6ZZA

R2ZZARA2ZZA

RA155ZZA

RA156ZZAR166ZZARA3ZZ

R168ZZARA188ZZAR4ZZRA4ZZ

—

R6ZZ

0.0469

0.0550

0.0781

0.0937

0.1250

0.1562

0.1875

0.2500

0.3125

0.3750

Conversion Table 6Deep groove ball bearingsShielded type (Inch series)


S ————— W ————— S ————— S ————— ————— X S ————— S ————— SS ————— F ——————

1.191

1.397

1.984

2.380

3.175

3.967

4.762

6.350

7.938

9.525


FR0

FR1

FR1-4

FR133FR1-5

FR144FR2-5FR2-6FR2

FR155

FR156FR166FR3

FR168FR188FR4B

FR1810

FR6

FX3/64

FR1

FX5/64

FAX3/32FX3/32

FAX1/8FX1/8

—FR2

FX5/32

FAX3/16FX3/16FY3/16

FX1/4FR188FY1/4

—

—

RF0310

RF0412

RF0516

RF0612RF620

RF0816RF820RF824RF2

RF1020

RF1220RF1224RF3

RF1624RF1632RF4

RF2032

—

F1191

F1397

F5/64

F2380F3/32

F3175F1/8AF1/8A/6F1/88

F3967

F4763AF4763B

—

F6350AF6350BF1/4A

F7938

—

ULK1505

RK1706

RK2508

ULK3006RK3010

ULK4008RK4010

—RK4012

ULK5010

ULK6010ULK6012RK6016

ULK8012ULK8016RK8020

—

—

FR0

FR1

FR1-4

FR133FR1-5

FR144FR2-5FR2-6FR2

FR155

FR156FR166FR3

FR168FR188FR4

FR1810

—

21/2FC

3FC

4FC

3332FC5FC

418FC518FC618FCR2FC

5532FC

5632FC6316FC

—

614FC814FCR4FC

8516FC

—

RIF-21/2

RIF-3

RIF-4

RIF-3332RIF-5

RIF-418RIF-518RIF-618RF-2

RIF-5532

RIF-5632RIF-6632

—

RIF-614RIF-814RF-4

RIF-8516

—

FLR0

FLR1

FLR1-4

FLR133FLR1-5

RIF-144FLR2-5FLR2-6FLR2

FLR155

FLR156FLR166FLR3

FLR168FLR188FLR4

—

—

0.0469

0.0550

0.0781

0.0937

0.1250

0.1562

0.1875

0.2500

0.3125

0.3750

Conversion Table 7Deep groove ball bearings with flanged outer ringOpen type (Inch series)


S ————— W ————— S ————— S ————— ————— X S ————— S ————— SS ————— F ——————

1.191

1.397

1.984

2.380

3.175

3.967

4.762

6.350

7.938

9.525


FR0ZZ

FR1ZZ

FR1-4ZZ

FR133ZZSFR1-5ZZ

FR144ZZFR2-5ZZFR2-6ZZSFR2ZZ

RF155ZZS

FR156ZZSFR166ZZFR3ZZ

FR168ZZFR188ZZFR4BZZ

FR1810ZZ

FR6ZZ

FX3/64ZZ

FR1ZZ

FX5/64ZZ

FAX3/32ZZFX3/32ZZ

FAX1/8ZZFX1/8ZZ

—FR2ZZ

FX5/32ZZ

FAX3/16ZZFX3/16ZZFY3/16ZZ

FX1/4ZZFR188ZZFY1/4ZZ

—

FY3/8ZZ

RF0310.2Z

RF0412.2Z

RF0516.2Z

RF0612.2ZRF620.2Z

RF0816.2ZRF820.2ZRF824.2ZRF2.2Z

RF1020.2Z

RF1220.2ZRF1224.2ZRF3.2Z

RF1624.2ZRF1632.2ZRF4.2Z

RF2032.2Z

RF6.2Z

F1191-2Z

F1397-2Z

F5/64-2Z

F2380-2ZF3/32-2Z

F3175-2ZF1/8A-2ZF1/8A/6-2ZF1/8B-2Z

F3967-2Z

F4763A-2ZF4763B-2ZF3/16-2Z

F6350A-2ZF6350B-2ZF1/4A-2Z

F7938-2Z

—

ULKZ1505

RKF1706

RKF2508

ULKZ3006RKF3010

ULKZ4008RKF4010

—RKF4012

ULKZ5010

ULKZ6010ULKZ6012RKF6016

ULKZ8012ULKZ8016RKF8020

—

—

FR0SS

FR1SS

FR1-4SS

FR133SSFR1-5SS

FR144SSFR2-5SSFR2-6SSFR2SS

FR155SS

FR156SSFR166SSFR3SS

FR168SSFR188SSFR4SS

FR1810SS

FR6SS

21/2FCHH

3FCHH

4FCHH

3332FCHH5FCHH

418FCHH518FCHH618FCHHR2FCHH

5532FCHH

5632FCHH6316FCHHR3FCHH

614FCHH814FCHHR4FCHH

8516FCHH

R6FRHH

RIF-21/2ZZ

RIF-3ZZ

RIF-4ZZ

RIF-3332ZZRIF-5ZZ

RIF-418ZZRIF-518ZZRIF-618ZZRF-2ZZ

RIF-5532ZZ

RIF-5632ZZRIF-6632ZZRF-3ZZ

RIF-614ZZRIF-814ZZRF-4ZZ

RIF-8516ZZ

RIF-1438ZZ

FLRA0ZZA

FLRA1ZZA

FLRA1-4ZZA

FLRA133ZZASFLRA1-5ZZA

FLRA144ZZAFLRA2-5ZZAFLRA2-6ZZASFLR2ZZA

FLRA155ZZAS

FLRA156ZZASFLRA166ZZAFLRA3ZZ

FLRA168ZZAFLRA188ZZAFLR4ZZ

—

FLR6ZZ

0.0469

0.0550

0.0781

0.0937

0.1250

0.1562

0.1875

0.2500

0.3125

0.3750

Conversion Table 8Deep groove ball bearings with flanged outer ringShielded type (Inch series)

Conversion

Bore diameter d

mm inch

Bore diameter d

mm inch

1.191

1.397

1.984

2.380

3.175

3.967

4.762

6.350

7.938

9.525

Bore diameter d

mm inch

Bore diameter d

mm inch

72 73

S ————— W ————— S ————— S —————— ———— X S ————— S ————— SS ————— F ——————In case ofstainless steel

RW0ZZ

RW1ZZ

RW1-4ZZ

RW133ZZSRW1-5ZZ

RW144ZZRW2-5ZZRW2-6ZZSRW2ZZ

RW155ZZS

RW156ZZSRW166ZZ

RW168ZZRW188ZZ

RW1810ZZ

1.191

1.397

1.984

2.380

3.175

3.967

4.762

6.350

7.938


RW0

RW1

RW1-4

RW133RW1-5

RW144RW2-5RW2-6RW2

RW155

RW156RW166

RW168RW188

RW1810

LX3/64

LR1

LX5/64

LAX3/32LX3/32

LAX1/8LX1/8

—LR2

LX5/32

LAX3/16LX3/16

LX1/4LR188

—

RE0310

RE0412

RE0516

RE0612RE620

RE0816RE820RE824RE2

RE1020

RE1220RE1224

RE1624RE1632

RE2032

E1191

E1397

E5/64

E2380E3/32

E3175E1/8AE1/8A/6E1/8B

E3967

E4763AE4763B

E6350AE6350B

E7938

ULU1505

RU1706

—

ULU3006RU3010

ULU4008RU4010

——

—

ULU6010ULU6012

ULU8012—

—

RW0

RW1

RW1-4

RW133RW1-5

RW144RW2-5RW2-6RW2

RW155

RW156RW166

RW168RW188

RW1810

21/2CE

3CE

4CE

3332CE5CE

418CE518CE618CER2CE

5532CE

5632CE6316CE

614CE814CE

8516CE

RI-21/2EE

RI-3EE

RI-4EE

RI-3332EERI-5EE

RI-418EERI-518EERI-618EER-2EE

RI-5532EE

RI-5632EERI-6632EE

RI-614EERI-814EE

RI-8516EE

RW0

RW1

RW1-4

RW133RW1-5

RW144RW2-5RW2-6RW2

RW155

RW156RW166

RW168RW188

—

0.0469

0.0550

0.0781

0.0937

0.1250

0.1562

0.1875

0.2500

0.3125

Conversion Table 9Deep groove ball bearings with extended inner ringOpen type (Inch series)


S ————— W ————— S ————— S ————— ————— X S ————— S ————— SS ————— F ——————

1.191

1.397

1.984

2.380

3.175

3.967

4.762

6.350

7.938


LX3/64ZZ

LR1ZZ

LX5/64ZZ

LAX3/32ZZLX3/32ZZ

LAX1/8ZZLX1/8ZZ

—LR2ZZ

LX5/32ZZ

LAX5/32ZZLX3/16ZZ

LX1/4ZZLR188ZZ

—

RE0310.2Z

RE0412.2Z

RE0516.2Z

RE0612.2ZRE620.2Z

RE0816.2ZRE820.2ZRE824.2ZRE2.2Z

RE1020.2Z

RE1220.2ZRE1224.2Z

RE1624.2ZRE1632.2Z

RE2032.2Z

E1191-2Z

E1397-2Z

E5/64-2Z

E2380-2ZE3/32-2Z

E3175-2ZE1/8A-2ZE1/8A/6-2ZE1/8B-2Z

E3967-2Z

E4763A-2ZE4763B-2Z

E6350A-2ZE6350B-2Z

E7938-2Z

—

—

—

——

ULUZ4008———

ULUZ5010

ULUZ6010ULUZ6012

ULUZ8012—

—

—

—

RW1-4SS

RW133SSRW1-5SS

RW144SSRW2-5SSRW2-6SSRW2SS

RW155SS

RW156SSRW166SS

RW168SSRW188SS

RW1810SS

21/2CHHE

3CHHE

4CHHE

3332CHHE5CHHE

418CHHE518CHHE618CHHER2CHHE

5532CHHE

5632CHHE6316CHHE

614CHHE814CHHE

8516CHHE

RI-21/2ZZEE

RI-3ZZEE

RI-4ZZEE

RI-3332ZZEERI-5ZZEE

RI-418ZZEERI-518ZZEERI-618ZZEER-2ZZEE

RI-5532ZZEE

RI-5632ZZEERI-6632ZZEE

RI-614ZZEERI-814ZZEE

RI-8516ZZEE

RAW0ZZA

RAW1ZZA

RAW1-4ZZA

RAW133ZZARAW1-5ZZA

RAW144ZZARAW2-5ZZARAW2-6ZZARW2ZZA

RAW155ZZA

RAW156ZZARW166ZZA

RW168ZZARAW188ZZA

—

0.0469

0.0550

0.0781

0.0937

0.1250

0.1562

0.1875

0.2500

0.3125

Conversion Table 10Deep groove ball bearings with extended inner ringShielded type (Inch series)


S ————— W ————— S ————— S —————— ———— X S ————— S ————— SS ————— F ——————

1.191

1.397

1.984

2.380

3.175

3.967

4.762

6.350

7.938


FRW0

FRW1

FRW1-4

FRW133FRW1-5

FRW144FRW2-5FRW2-6FRW2

FRW155

FRW156FRW166

FRW168FRW188

FRW1810

FLX3/64

FLR1

FLX5/64

FLAX3/32FLX3/32

FLAX1/8FLX1/8

—FLR2

FLX5/32

FLAX3/16FLX3/16

FLX1/4FLR188

—

RFE0310

RFE0412

RFE0516

RFE0612RFE620

RFE0816RFE820RFE824RFE2

RFE1020

RFE1220RFE1224

RFE1624RFE1632

RFE2032

FE1191

FE1397

FE5/64

FE2380FE3/32

FE3175FE1/8AFE1/8A/6FE1/8B

FE3967

FE4763AFE4763B

FE6350AFE6350B

FE7938

ULKU1505

RKU1706

—

ULKU3006RKU3010

ULKU4008RKU4010

——

—

ULKU6010ULKU6012

ULKU8012—

—

FRW0

FRW1

FRW1-4

FRW133FRW1-5

FRW144FRW2-5FRW2-6FRW2

FRW155

FRW156FRW166

FRW168FRW188

FRW1810

21/2FCE

3FCE

4FCE

3332FCE5FCE

418FCE518FCE618FCER2FCE

5532FCE

5632FCE6316FCE

614FCE814FCE

8516FCE

RIF-21/2EE

RIF-3EE

RIF-4EE

RIF-3332EERIF-5EE

RIF-418EERIF-518EERIF-618EERF-2EE

RIF-5532EE

RIF-5632EERIF-6632EE

RIF-614EERIF-814EE

RIF-8516EE

FLRW0

FLRW1

FLRW1-4

FLRW133FLRW1-5

FLRW144FLRW2-5FLRW2-6FLRW2

FLRW155

FLRW156FLRW166

FLRW168FLRW188

—

0.0469

0.0550

0.0781

0.0937

0.1250

0.1562

0.1875

0.2500

0.3125

Conversion Table 11Deep groove ball bearings with extended inner ring,Flanged, open type (Inch series)


S ————— W ————— S ————— S ————— ————— X S ————— S ————— SS ————— F ——————

1.191

1.397

1.984

2.380

3.175

3.967

4.762

6.350

7.938


FRW0ZZ

FRW1ZZ

FRW1-4ZZ

FRW133ZZSFRW1-5ZZ

FRW144ZZFRW2-5ZZFRW2-6ZZSFRW2ZZ

FRW155ZZS

FRW156ZZSFRW166ZZ

FRW168ZZFRW188ZZ

FRW1810ZZ

FLX3/64ZZ

FLR1ZZ

FLX5/64ZZ

FLAX3/32ZZFLX3/32ZZ

FLAX1/8ZZFLX1/8ZZ

—FLR2ZZ

FLX5/32ZZ

FLAX3/16ZZFLX3/16ZZ

FLX1/4ZZFLR188ZZ

—

RFE0310.2Z

RFE0412.2Z

RFE0516.2Z

RFE0612.2ZRFE620.2Z

RFE0816.2ZRFE820.2ZRFE824.2ZRFE2.2Z

RFE1020.2Z

RFE1220.2ZRFE1224.2Z

RFE1624.2ZRFE1632.2Z

RFE2032.2Z

FE1191-2Z

FE1397-2Z

FE5/64-2Z

FE2380-2ZFE3/32-2Z

FE3175-2ZFE1/8A-2ZFE1/8A/6-2ZFE1/8B-2Z

FE3967-2Z

FE4763A-2ZFE4763B-2Z

FE6350A-2ZFE6350B-2Z

FE7938-2Z

—

—

—

——

ULKUZ4008———

ULKUZ5010

ULKUZ6010ULKUZ6012

ULKUZ8012—

—

—

—

FRW1-4SS

FRW133SSFRW1-5SS

FRW144SSFRW2-5SSFRW2-6SSFRW2SS

FRW155SS

FRW156SSFRW166SS

FRW168SSFRW188SS

FRW1810SS

21/2FCHHE

3FCHHE

4FCHHE

3332FCHHE5FCHHE

418FCHHE518FCHHE618FCHHER2FCHHE

5532FCHHE

5632FCHHE6316FCHHE

614FCHHE814FCHHE

8516FCHHE

RIF-21/2ZZEE

RIF-3ZZEE

RIF-4ZZEE

RIF-3332ZZEERIF-5ZZEE

RIF-418ZZEERIF-518ZZEERIF-618ZZEERF-2ZZEE

RIF-5532ZZEE



RIF-8516ZZEE

FLRAW0ZZA

FLRAW1ZZA

FLRAW1-4ZZA

FLRAW133ZZAFLRAW1-5ZZA

FLRAW144ZZAFLRAW2-5ZZAFLRAW2-6ZZAFLRW2ZZA

FLRAW155ZZA

FLRAW156ZZAFLARW166ZZA

FLARW168ZZAFLRAW188ZZA

—

0.0469

0.0550

0.0781

0.0937

0.1250

0.1562

0.1875

0.2500

0.3125

Conversion Table 12Deep groove ball bearings with extended inner ring,Flanged, shielded type (Inch series)

Conversion

Bore diameter d

mm inch

Bore diameter d

mm inch

Bore diameter d

mm inch

Bore diameter d

mm inch

7574

SR2X52ZZSSR144X100ZZSSR174X5ZZS


SR3X31ZZSSR3X23ZZS

SR186X1SR3X31SR3X23

WSP2824—

WSP4041

——

SR1A-559

S4763A/8——

SR186X1SR3X31SR3X23

A245——

———

4.762

NSK ADR FAG GRW BARDEN MPB NMB

0.1875

Conversion Table 13Ball bearings for synchros(Inch series)

Open type

WSP3621ZZ—

WSP3630Z

——

WSP2824ZZ

—WSP4041ZZ

SR1A-679Z—

SR1A-552Z

——

SR1A-779Z

—SR1A-559Z

———

———

——

SR2SX52—

SR174SX5

——

SR186SX2

SR3SX31SR3SX23

———

———

——

———

———

——

3.175

4.762


0.1250

0.1875

Single shielded type



SR3X31ZZSSR3X23ZZS

WSP3621ZZ—

WSP3630ZZ

——

WSP2824ZZ

—WSP4041ZZ

SR1A-679.2Z—

SR1A-552.2Z

——

SR1A-779.2Z

—SR1A-559.2Z

S3175/6-2Z—

S3175/552-2Z

———

—S3/16/14-2Z

SR2SSX52—

SR174SSX5

——

SR186SSX2

SR3SSX31SR3SSX23

A281—

B70

——

D893

——

SSRI-418ZZA02—

SSRI-418ZZA7204

——

SSRI-6632ZZA0208

——

3.175

4.762


0.1250

0.1875

Double shielded type

Conversion

Bore diameter d

mm inch

Bore diameter d

mm inch

Bore diameter d

mm inch

CAT. NO. E126h 2011 B-11 Printed in Japan ◯ＣNSK Ltd. 2011

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