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Document Provided by Truthread Gauges & Tools Pvt. Ltd.
PARALLEL THREADS NOTE : P = CONSTANT
P = PITCH OF THE THREAD W = MEAN DIAMETER OF THE CYLINDERS USED.
DESIGNATION TYPE OFTHREADS
‘P’ VALUE FORMULA
SPECIFICATION
BASIC DIMENTION GAUGINGPRACTICE
M
ISO METRIC 60ºTHREADS{For general fasteningpurpose}
P= 0.866025 × pw ISO 7241993ISO 965/11998IS : 4218 (Part 3) 1999IS : 4218 (Part 4) 2001
ISO 1502 – 1996
IS : 2334 – 2001
UNC , UNF, UNEF,UN , UNS
UNFIED INCH 60ºTHREADS{For generalfastening purpose}
P = 0.866025 × pw ANSI B 1.11982 ANSI / ASME B 1.2 – 1983
GPIPE THREAD 55º {where pressure – tightjointly are not made onthe threads}
P = {0.96049 × p}–{1.16568 × w} ISO 228 / 12000
IS : 2643 (Part 3)1999
ISO 228 2 1987
IS : 102161988
AcmeACME 29º THREADS( for transmission ofpower & motion )
P = ( 1.93335 × p ) –(2.9939 × w) ANSI B 1.5 1999 ANSI B 1.5 1999
Stub Acme
STUB ACME 29ºTHREADS( for transmission ofpower & motion )
P = ( 1.93335 × p ) –(2.9939 × w) ANSI B 1.8 1988 ANSI B 1.8 1988
Tr
ISO METRICTRAPEZODIAL30º THREADS( for transmission ofpower & motion )
P = ( 1.86602 × p ) –(2.8637 × w ) ISO 2903, ISO 2904
IS: 7008 (Part 3) 1988IS: 7008 (Part 4) 1999
DIN 103 Part 91985
BUTTBUTTRESS INCHTHREADS7º / 45º FORM (for transmission ofpower & motion)
P = ( 0.89064 × p )–(1.15689 × w )
ANSI B 1.9 – 1973 & BS 1657 1950
ANSI B 1.9 – 1973& BS 1657 1950
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TAPER THREADS
DESIGNATION TYPE OFTHREADS
‘P’ VALUEFORMULA
SPECIFICATIONBASIC DIMENTION GAUGING PRACTICE
NPTPIPE THREADS 60ºGeneral purpose(Taper 1:16on ø)
P= 0.86574 × pwANSI/ASME B:1.20.11983
For Standard Basic Type &
H28 (Part II)1957 for ‘StepLimit’ Type
ANSI/ASME B:1.20.11983
For Standard Basic Type&
H28 (Part II)1957 for‘Step Limit’ Type
NPTFDRYSEAL PIPETHREADS 60º(Taper 1:16 on ø)
P= 0.86574 × pw ANSI / ASME B 1.20.3 – 1976 ANSI / ASME B 1.20.5 – 1991
R/ RcBSPT
PIPE THREAD 55º where pressure – tightjoints are not made onthreads(Taper 1:16 on ø)
P =(0.96024 * p) – (1.16568)w ISO 7/1 1994
IS : 554 1999
ISO 7/2 – 2000
IS : 89991979
NGTTYPE 1 (SIZE 2)Taper threads 60º ofGas cylinder valves(Taper 1:16 on ø)
P = 0.86574 * pw IS : 3224 2002 IS : 9121 1979
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SIZES OF CYLINDERS FOR EFFECTIVE DIAMETER MEASUREMENT
SR.NO.TOTALINCLUDEDANGLE OFTHREAD
SMALLEST øIDEAL OR BESTSIZE CYLINDER LARGEST ø
1
2
3
4
5
60º
55º
29º
30º
7º / 45º BUTT
0.505 * p
0.506 * p
0.487 * p
0.489 * p
0.577 * p
0.564 * p
0.516 * p
0.518 * p
0.54147 * p
1.010 * p
0.853 * p
0.650 * p
0.652 * p
0.61433 * p
MAX. CYLINDER
“BEST” CYLINDER
MIN. CYLINDERNOTES
• WHILE SENDING AN ENQUIRY PLEASE ENSURE THAT CORRECTTHREAD DESCRIPTION IS MENTIONED ALONGWITH THE CLASSOF FIT,(IF SPECIAL, THEN PLEASE FURNISH COMPONENTDIMENSIONS / DRAWINGS) & SPECIFICATIONS TO BE FOLLOWEDOR ELSE THE ABOVE SPECIFICATION WILL BE APPLICABLE.
• THREAD RING GAUGES BELOW 20 MM ARE MANUFACTURED ANDCHECKED WITH THE HELP OF CALIBRATED MASTER CHECKPLUGS. (IF DIRECT MEASUREMENT IS REQUIRED, PLEASEMENTION ON ENQUIRY AND PURCHASE ORDER.)
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