Cn1•r•~l•/.nMI lut• ”......... 阳酬阳I by II由酬阳伽·’”制”附Mr””’鸭”’挑战时叫“’叶’，.，＿.... , .. 州’咱嗣l wnt刷d‘ω·”’啪””’a

Pipe Th reads, General Purpose (Inch)

AN AMERICAN NATIONAL STANDARD

INTENTIONALLY LEFT BLANK

c。pyr川gh l ASME lnlemal;onal Pr。v ;ded by IHS "nder 1;cense wUh ASME No reprodocl;on or ne lwork;ng perm;lled 阳帆。＂＇ license from IHS

C副＂＇句’锦州Mr 1.-1阳回

Pipe Th reads, General Purpose (Inch)

AN AMERICAN NATIONAL STANDARD

A拥J、）€※S( 口也M The Am~rican Society of U巳J® Mechanical Englnee『S Two Park Avenue • New Yo1·’k, NY • 10016 USA

Pr制l\lf!I by II m ~＇＂l•r ＇＇”’啕，...’”’回阳”。，”＇＂州i刷刷刷’陶，＿k崎阳，阳”’刷刷＂＇°＇＂ ........ ~.，~ 1118

Co间’(Qr•~SMr 刷刷f阴阳f回

。目1自由f lssuRnee.』 N口vomber 1 !i. 20l 3

Thl!i Standard will be revised WIH!n th!! Society af)proves the lssuanrn of n r10w edltlofl . There wlll be rio writ怡『i Interpretations of the requirements of lhls Standard Issued to this edition.

Pcrlodically certain actions of the ASME Bl Committee may be published as Cases. Cases are publish et! on the ASME Web site under the Committee Pages at http://cstools.asme.org/ as they are issued.

Errata to codes and standards may be posted on the ASME Web site under the Commlltoc Pilgcs to provide corrections to Incorrectly published I tems，。r lo correct typograplllcal or gr.imn1atlcal erro臼In codes and standa『ds. Such c『rala shall be used on the dale posted.

The CommlllcH! Pages can be found at hLlp://c!lLools.osme.org/. Tl1crc Is 日n option avail日ble lo automallca lly receiVI! an e·moll notlncatlon when errata are posted to Q pa『tlcu lnr code or standard. This option can be founcl on the approprlt1l t' Comm Ille<> P司r:e ti flu「 selecting ''Errata“ In lhe “Publlentlori Information” sec lion.

l\SMr I~ th!! 1ogls1erc·d tmrJ1•m11rk ol 11w A111orlt;i11 Soιll'ly of Mcchnnlcr1l l:.n1Jlneu币，

'rhl~ coifo o『 『tu11d 11rd wns developed 1111der p1occclurcs nccredlted as rne~t lng the crltorlil ro1 A阿lcrlt目内 Nttllono lSrtmdord』. TI1u Stundardn Co1111nll1110 thm npprovi1d llw cod11 or vtoncla「d was bolnncecJ to 阴5urc 1ho1 lndlvld1 1~1日 rromcompetent ant.I concerned lnternsts have had on oppo此unity I口 parllclpillu. Thu proposud codo or storidurd wOD mn<lc ovnllnblo ror public rovl1:w ond (O fflfr1日nl thnt providos nn 01>pnrtunlty for nddltlonnl public Input rroni Industry, 11cadc『nl日－rcgulutory ilgcnclos, and the publlc·nl·I日『1:10.

ASMt docs not "nrl)『（）VC，”“阳I口．”。『“cndorsr＂罚oy I tam. tonstr11ct I口n, proprletarv dcvl恨，。r octlVlly, ASME doc~ not I日kc i:rnY poslllon wJlh rosp咽cl lo lhC' volldllY of any pt1hmt tlghl~ M~Ollod In con11ect1ori with nny

Item~ lflcntloncd In t hl~ dociJ1111ml. nnd lloes n口l undertake 111 Insur!! anyonu ullllzln!J n ~londard i.11'1<1lhsl ll~blllty tor 1nrrlnuort10n1 of 1111y n1mllcnbl~ liittor& pnlvnl, nor o~~um柑岳 .1ny r.11ch llnbllt(V. U5er5 or 11 code or s1a11d11『d 目re E且presslyncJvlsed lhal deti!『mlnatlon or the volldlty cl any such patent rlr,hts，。nd the risk or lnfrl内！！CJITl~nl o『 sud; r11i11ts, I& cnilroly thoh own rc~pon~lblllty,

Pmllclpallon by fodcrnl agency roprnscntilll\lo归）口『 pumih(s) .ifl lliatod with lndu5try la not to be Interpreted M govurnmcot or lody5t叩 i:ndor~emenl of thli; code or ~协nd~『d.

~o part ol this dotum~nt may ba roproclucocl ln onv I口明，In an elei;trnnlc retrhlllnl syslem or othe附Is也

wllhou1 the prio『 wrlltun purmi:i~ion of tho pul>ll~hor.

The! ArMrlC1in 50~1白ty cl McthDnltnl Enf)lnr.crs Two Park Aven11e. New York; NY 10016·5990

Copyright «> 2ou by THE AMER比AN SOClrrY OF MECHANICAL ENGINUERS

!\Ii rfghlii reserved Prlhtod In U.S.A.

P用刷oo by 111n ＂＂响rll<4惘＂＂＇lllo\IMf”n l•llfOOll嗣＂＂＂＇ OAI唰问问rm•ll•d叫lhP•~ln”＇＂＂＂"1111唱

CONTENTS

Poreworrl . •..... , . • ,‘………..……………………………………………… iv Commilleo Rosier ... ..…… b ……........... ...... .. f.. ...... .. .. . . . . . . . . . . . . .. . .. . . v Corr℃spondmce With the Bl Cornmille!i' .. ... ....‘. ......,... ‘…………………… .. vi

1 lnlroductlo『1 .. ......“··‘~ . f .…4 ……·’‘......,.... 2 Aml!rlcan Notional Standard Pipe Thread Form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . 2

3 Specification fo『 Tape『 Pipe Thread5, NPT ................ ,……… • •I ………..… 4

4 Specifications For Int昌rnal Straight Threa~s In Pipe Couplings, NPSC ... • . . • . . . . . . . . . . . l3

S Specifications for Railing Joint Tap画r Pipe Threads, NPTR ... , .......•... , ... , .. ,,,,.,. JIJ

6 Spoclflcatlons for Straight Pipe Threads for Mechanical Joints; NPSM, NPSL ........ , . . 1.6

7 Gages and G田go Tolerance5 for Ame『lciln Nallonel S阳”dard T画per Pipe Thronds, NPT, ....... , , .. , . ... , ... , , . , ... , ... , .. , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . l 9

Figures I Root, Crc肘， nnu l司lnnk 巳r11511~cmcnl, NPT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Urniic Jlorm o「 /lmoricnn NA tionnl Slondmd ’11\pcr I’ipc Thrc11tl, NrT ... ., .. .. .. .. .. 3 3 1\1t1crienn Nnlionnl S11mdn1·cl ll<lpllt' l'lpc Tiu‘end Nolatlon . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 Ct1glng Bxtcrnnl 1\1pcr Thrc11J~ With J..1 Rl11g Cn萨 ……………..... . ........... 10 5 Cnr;ing of Ch11mf1:附d 丁h附ndt. …………………........... . , .. , .. ,,, ..哩．，，，，，， 川6 Gt1glnA lnternnl Thpc1 Thi’cods Wilh 1~1 l’lugG11日c .... . ...... .. ..... .. ............ 12 7 NPT Shmdnrd Tnpur Plpo ’nw . .!ad rli1g und Ring Gogcs , , ..•... , , , . , .• ，‘ ．．． ．，，，电.. 20 8 Sul~日U创ucl Porm of Gil吕c ' l11rvnd ....... , . ........... . . . ... , ... , ... , . . . , ...哩.... '.. 2J

Tables 1 Limi·ts on Crest nncl Hoot 啊’unc11tion of Amc~ricm1 Nnlfon日l Stnndurd Exlcrm1]

.mu lnlPrnnl 币1p日r Plpr Thrcnda, NPT . ..... , ..•... .. , .......................... 电

2 Basic Dln1cnslons o( J\mcrlcnn Nnlional Stnndn时 ’I'npcr Pipe 'fhrend, NPT . . . . . . . . . 8 3 Tnlt'r~nces on 'f11pe1; Lead, Emd /\ngl<.? of Pipu Thn;11tl1:1, NJ>T . . . . . . . . . . . . . . . . . . . . . . . I 0 4 Dlmcnslo1is, lriterm1I Strnlghl Thmnd~ in Pipe Coupli『1g, NPSC .......句. . ......... 14 5 Dinwniiici.ns of Exl~.rnnl :11id lntcr11nl Tnpci' PJpc Threads for i{alllng

Joints, Nl'TH , ..‘ ; ~ . ' f l ……………………………………………….. 15 6 Dimensions or 11x t~rnnl and lnlcmi!I Strnigh l Pipt: Thrends for Fixtu1·ci:;, N I宅M .. ... 17 7 Dimensions, F.xtcrMI and lfltC'r.nnl Strolght PiJ' i.' ·n1rcnd for Lockm1t

Connedions, NPSL …………… E ……... ' .. . ' ... ' ..... .. '.' ' .. .... ' .... '... 18 8 Basic Olmcn::>iQnl! of Thrc11dcd Gog四 for American N<1 tJunnl Stllndnrd Tllpur J31pc

Thrends, Nl叮 ．．．‘． ． ，．．．．．．．．．，，，，， ． ．，． ． 哩 • ••• op& & &‘……………………….. 22 9 Workin吕 Gngc Tolumnccs ror Amcrlcim Nntionnl Sl11ndnrd Tnper Pipe

币iri.;nd, N.PT ... . . ... ..... . . .. .. .. . . .... ... ... .. . . ... .... ， ，，雹 ， ．．．， ， ， ， ，，， ， ，， ，， ，叫 2型10 Oimneter Eguivilletlt of Viltii.!tion in ITnlf lnduded Angle of Tiuc11d for Tools

1md Cages .... . .嘎. .. ,, .. •. .. ... •.. .. •.. ... ' ' ... ' ... ' ...•. ' ... .... . .. . ... . .. . . .. 25 1l Dlnmeter Equivnlenl of Vnrinlion in tead for TotJls and Cage:; .............. .. υ ＇；. 26

Nonmandalory Appendlc国A The! Tums o( Engngemerit Melhod of Caging 1~roduct Thrends .川 . ..….. . 川－ － ··川. 27 B Thp Drill Si~es ... , ..“.. .... f ' •• •• •• ' ••• '' . ' •• ' ••• •••• ' ••••• • • ' ••••• ' ••••••••• '. . . 28 C Th.read 'fypcs nnd Correspcmdi11总 Gngcs and G11~i11吕………·‘＇ ... . ' .. ' ... . ' .'. '. 29

ill

COl!j!IQ" /.&MC M町帽＇＂唰Pf叫“•tl I)'/ lllll un脚 ＇＂＂＇’” Wiiii d飞机’I'”。，”归国际t<1n m n•l-lk>11 1ti1’”’11i.1twttl\““』刷刷！’”’川，国

。刷崎1• AllM( h•IOll酬。恻

FOREWORD

Tn 1973, American Nnlional Stnndnrds Comn1i11ce ll2, wh、kh hnd formerly been 陀甲onslblc (or pipe lh二rCummittcc 81 且ncl r巳orga且u且·d ns Subl：οnun ill巳c 20. A comp let俨 n>writ＇~ of lhe 132.1-1968 stimdord on Pipe Thmnds (Except Drγsct1 l) wns undurtnkl'n. It wos 口pprovcd ond formnlly desisnntcd ns nn l\m\•ric;in Nntiunnl St.111dnrd on rtebnrnry 4, J983 lmtl wns ren(firmcd in 2001 nnd 2006. Tht! system of numbcrini;; to indudt! metric uυnvl.'rSio11H, iH ns fol low吕：八NSl/ l\SMo 日1 .20.1, Pip日 ’fhr1mcls, Cc>ncrnl Purpo~c (Inch) 八SME IU .20.2M-2006, Pip~ l1'1'c01dS，白。”， Cl•Jwrnl I'υrpni;~· (Ml!l-rlc Tra1\lilntlon) Tl忧民C 1Hundnrtls1 J\NS1／八SME 01.20.1 nnJ 131 .20.2M1 h目VP product Lhr.t!ncl clin'll!Tislons n1'd

i;n1~ing in lhl.! 1mml! duel』口M~nt . Thread lnt.pccllun specifics the 11sc of L.1 taper lhre11d r,;igoi; simllnr lo I珑，1-1968. In nddiliun, cmphusilj W11R glv1m l(l lhe rct111l陀nicnt thnl 1111 bMic lhrt>t1d de:ils-n dimensions wPrc to be m~t within the spcrificd tolcrnnccs.

This rcvlfllon or ANSJ/ASMJ~ 131.20. 1 h日， both 臼ifintflc.1nt imtl 11ubllc i;ubstm1tlve chnnges to the 1983 revision. It Is more explnnnlory for thi;- user lhnn the p民•viuus revision. Slgnlrlcnnt rhn"gcs ;1rc .1s follows:

(n) l\n ncccplobllity sccti<m hns bl•tm ;idJt'U, pruvidlni; ,; rcfc1'Cc methot.1 In COSt.'lJ o( rlisputc This 11cJ..11owlcflgt'R thi' pot·(.-mtinlly widt• but ncccptnbh: v.irlntlu的 In U1t: prcscribc<l goges nnd gogll\g 11飞clhods.

(/J) Flguf\'s hnvc been upd.1tcd with ‘1ddlt lcm:il inforn1.1l lon nnd drown lo be more vis1mlly 明plnnntory.

(i:） 节、·1飞trn!l or 自1gi1&cmcnt nwlhod h.1s been moved 10 nn nppcndix, tluc I() its liihcrcnl gngc cor陀li1t lu11 11:.:;m:s This gagh1路 tnl·lhod mny bl' 11'1cd wlw11 pnrtks ngn飞 but ii Ii. no longer t’” al'Cl'plcd mcthud wllhl11 the Stnndord.

(d) l'nk11ln 1 1、d d.11日 hnvl! bl:l•n rvvisud fo川owing the ro11n1llng rul0s o ( BI .30M. This provldi.:s 问 Ntandru·dized high lcv叫 nf prt•dshm l11 c011cull11io11. Some lL1 b11lnlctl vnh•cl.4 chnngcd, but no rhn nges Wl＇陀 dcrnwd sig•、Hie.int enough I<) nffcct thl' co11 fol'muncC' stulus of products ()r gngcs. These chnn日c11 o r1.• 只enen1lly beyond llw mnrgln oJ t‘rror of lhl; rcqlllrcd rncnsu氏·mllnlB . NITK, NPSM, uml Nl'SL lhrcnd diml'na ion日 WPrf' nnl ll'Cn k11lntcd ll!l som~ hltilnrlcal 1nethodolt咆y,ricccssnry for compulnlion, wns not nvnllnbk-.

(t') Cuidnncc? for tnp drill siws h;u; been upJatcd lo 1 ellel'I vnrying mnnufoclltrins rondltioni; flnd the widur rn n!Ie of •wRilable drill !liL.t!i.. lns lcnd of 11pcdfylng llrlll sizes, the Slnndimt now 1·dcrs lo lht• tnbulntcd basic minor dinnwtcr of the lntcrntil thrc<ill ns a rcfc陀nee in which to bnsc drlll ~i7.~ choice.

(j) l\dtkd ore dl'lllill•cl explflnnl ion:; on llw rH~clR uf cunt ln/{i; 1.111 lhrcn曲， ns well ns guldnflC~ for prcco,1 Llng size compensation.

(g) The gagln吕 point of li:fcn.-nec ig 1novcd for cxlernnl thnmd'i hav ing chnmfer dinmcll'l's 岛muller th自n the rnl110r diameter .it U1e smnU end. '111is chongc wns m口de lo help ensure adcqualc thrcnd en将agcmcnt over a wider rongc o( product th陀nd d mmfors. Thii; chnnge i:; correspondent to lhc existing Lrcatmef11 of d11unfc阳 for lnkrnnl thrt•11ds.

(Ji) The point of mfo1℃nee for che<:kin吕 weilrυn working gngei1 is changed lo basic. Previously, the point of wforcnce wa昂 thci;iz巳，1t the Umc of 111白nufo.cturc. TI1is chnngc fnciUtntcs lht> c11librntion o( gnge四 when the originill !lize a t mimufac:turc 111 not known :md stondnrdizes gnge ~ i1.e:; nt moxlmum wear.

(i) Gnging g时dance for slrnighl pipe thri.-aclιhn:; bv1.m expanded, Including nllowlng the No­Go ln enlcr up lo lhft'P, l11m:i, mimicking ASME B1.2.

(iJ The use o( ind icnHng gtiges htis bι吃n ndd ecl Mn gai.;i咱 method.Pullowl11吕 tlw npprovnl~ of lhe Slnmforcl~ Cnmmitlvc nncl ASME, npprovnl for the HL:W cdlllon

wos grnnted by ANSI on October 15, 2013. 八11 rcquc11ts for interpretation or s\lggeslions for rcvl1iln1111 国hould be &cM to U1u Secretory,

131 Commlller, The American Society or Mcchnnknl Fnglnccn.， 节＂＇O Pnrk 八venue:, New York, NY 10016-5990.

P刷刷i问 ii惜刷刷机制”＂＇lhMMl”。”W刷刷刷刷闹剧呐俐’1唰阳’llld ＂＇＂＂＇，，旬’仿．．，阳”””

ASME 81 COMMITTEE Standardization and Unification of Screw Threads

(Thi: rolluWlhil I& thi: ro~tcr or ihi: Commllim: 31 the ilml.' of approvnl or this St1111dnrdJ

STANDARDS COMMI节EE OFFICERS

儿 L 日llffOW~， Cll(l[r D. S. Goorgo, Vice Chair A. L. Gpzmnn, Secrcwv

STANDARDS COMMITTEE PERSONNEl

儿 L Banows, SwansQn ·1001 Man11racturlng, inc. It Bly, V•llll\日’11 Th『and G司匾。G. A. Cucclo, Cnpltol ManuladL1rlng Co. R. Oo!lsa. Pon11oyu; ootlgu co. D. Eve『『ett, National lnstltUtl! of Stando『ds 晶 TechnologyJ. o. Gehret l” ’ Vcrrr1on1 rhroad Cingo, LLC O. S. Georgo, Rornr.o Spccloltrcs I· GQ网，剖， KQtr Lnkosldc, Jn( , J, G『ocnsliida, l ntJusJ rl~ I Fn坠！Onll『 l n~l.i[Ul(IA. L Guzrnon, The l\mcrlcnn Sa(icty or Mc~hnnlrni F.nB1ncer~ R. J, ”okorl, SPS rocf111ol0Nloi. L. C. Johnson, The lohnson Gop,c Co. P. A. l.MOI』ch暗， 11/lomritc. the Joh11so11 Gage Co. D. 。， Koll, Prctl&IOn FlllfliH)

民. P. Knlttel, 1.Cl\l>eh‘ ll.S. Ltd. ” , 14. MtWllll1m虫， PMC L口nQ Sia『。. R. Melsth, 11/larnull!, f'MC lone Slo『。必 Mlsklnl9, Ke同nnmcta l, Inc. O. R. On5, Scnwuy Bolt & Sp口Cl lilt C口1口，＇· 自. Popovic, Cleveland Spcclallty Inspection Services, Inc. M. w. Rosa, GI目stonbury southl;rn Gos~ £. Schwa『·t z, C口『1su ltant

e. F. s11afflnr, P「（：~fHlt· Rnntl Co. D. Slllorskl, Co11trlb11tlng MamboιShirtl『＇8 Gt111l! & Colib1.1tfu11, LLC R. 。. Strong，口oc『k('n Corp. A. F. Thlbodo~u. llonomry Mumln•r, Swnn~on Tool I响，mufnetu rlrill.

Inc. C, J , Wll仰n. co111rl1J11tl11n M111111>or. ton『u1t,1nl

SUBCOMMITTEE 20 - PIPE T”READS

o. O. Kntz, Cflofr, Prctlslo11 Fi ll ing~ P. A, u11011cllo, VI«• C/1(1/f, rho John~o川 Goiic co. K. Oly, Vermont Thread Go!Jc M. Co,1t, Contrlbtlllng Mllm/J11ιConsul1日nlG. A. ( UCCIO, CtiJ)lttJI M~11U!IJC lillii'l il CO. 自. Dodge, f'ennoye「 Dodge Co. J. o. Guhrel Ill, Vermont l 'hro11d Gusu, LLC ). R. Gervasi, Kerr Lakeside, Inc. J, A. Gruber, Contr/Llutlng M11m1Jr.r, ｝. 八白『11be『品 冉~soclot日s, I.LC L. c. johnson, The Johnson Gn11l' C口，R, P, l<nlttcl, Lel\e(h·U,S, Ltd.

C叫刷刷。t MMC ln!ntnnl~n"4 p闸咧呻d by I”ft v•hl刷刷悼＂＇＂ Willi，＼自MG刷刷刷刷刷田阳，.... k闸’OfM!lilt~w,tl幽nllttr.＂＂唰 ill!

v

X. LI, Cantrlbutf11c1 Mvmbor, Chi阳 rroiJuctlvity crn1u1 ro1 M臼ch ine『y lndust『V

。， R， 阳咀Isch, PMC LOllll SI月rM. H. Mt Wlllloms, PMC LQno Slur p, R. OnJ, ScQwny Boll 冉 Sp~tll'l l ~ Ca1p. J. R. Popovlr, Cleveland Spctlollty lnnpoctloM ScrvlCi.:I!, Inc. M. W. Rose, Gln~Lonllu ry s口uthom Gage A. D.Sh由自he『＇!l, E1.,u110 corp. 。. Sklerskl, Conrrlbutlrig Member, Ste『llng Gaue & Callbiatton, LLC A. F. Thl!!od自11u, Conlr/liut/110 Member, Sw11o~o ri 而目l

Manufacturing, Inc.

缸’肿’咱HAll蛐 恻刷＂＂＇＂＇咽

CORRESPONDENCE WITH THE 81 COMMITIEE

General ASME Standards ilrl! uevclupcd ilnd mnlntnhwd wilh the inlc11l to repwst•nt lhl' consensus of concerned intere~b;. A::; i;uch. uscr1> of Lhls Standnrd moy interact with 由eCommitter by 1equ1:岳ling interprelations, proposing rcviakms, .mt! uttcnc:lln民 Committee mectin~s. Corre­叩onel~ni:c 11hould be ncldrι咽cd lo:

Secretn『如； 131 St目ndnr功也 Committee

The Americnn Society of Mcch1mical Eni;lnwr昌’I'wo Pnrk Avenue New York, NY I (lO l6·59\)()

Proposing Revisions. Rcvisium1 are mnc.Jc purlodkolly lo lho Slnndnrcl to incorporate clrnngcs lhnl 11pp1•11r necessaryυr dcsir:iblc, .1s domo11日trn tcd by the cxpCl'lence goined from tlw 11pplicnlion u( lhc Stondnrd. Approved revi吨ioni. will be published periodic‘illy.

·11ic CoinmHlcc welcomes proposnls for n•visio附 to lhl自 St.rndorcl. Such proposnls shoulu be ns i.peclflc ns possible, citing the pnragroph number（吟， the prop1Jsccl wording，。mJ a detnllcd dci;cription t1f Lhl' reasons for lhl‘ proposnl, including nny pL•rllncnt cl11cumcnlilllttn,

Proposing a Case. Cases m.iy be Issued fur the purpose of providing nllcrnaltvc mies when justified, tn pl' rmlt c;irly implcrncntollon uf n11 approved revision when the need is urgl•nl, or to provl<k rulct> not covi:red by existing provi』ic.n1i;. Cnse!l 111c d foctive immcdln ti>ly upon 八日MI!npprovol and shnll be posted on thr 八SME Corn111illec Web 阴阳·Re斗11＼：目l fo1 Co!lcs sholl provide .1 Stoh•mcnt of Need and Bac:k也round Tnfomu11ion. The rctJlll!tol

should ldcnll(y the Stnndn时， the pnro1~rnph, ni;urc ur liible number（吟，目nd bo wrillt•n os n Qut.'Stlo11 nnd Reply In the some fornrnl ns t•xistin1~ Coi:ws. RL·quc吕l for Cnsci; should olso lndlcn tc tlw nppllcnhlc cdlllon(s) or the Stonclnrcl lo which lht.• proposed Cnbe nppllci:..

Attending Committee Meetings. 1'hc B1 Stooclnrdfl C<>m mil11•c n、自ulnrly holcl:; mccllngs, which ore opl'n IP the public. Persons wh:hlng to nllend nny mcdlng i;hould contncl the Sl'Crclnry υf llw 131 S11111d11rd11 Cmnmill't'c.

vi

，，..，帽负＂＇ by刷’由剧”队…＇＊＂＇lhAtM[

闸’•I"<'如帽”“’”阳叶’Opo<m•I’“＂＇＂＇＂＂ ~回.. ..... ””

ASM~ 81.20.1•2013

Pipe ThreadsJ General Purpose (Inch)

1 INTRODUCTION

1.1 Scopl? This Stnndar~ covers dlmcnsio"8 rind gaging o! pipe

Uueods of 1'11e following i;or妃H!

Nl"I' NPSC NP＇「R

NPSM NPSL

1.2 Reloted Standord

l lu6c cou):>Jin吕jul11ta nru ordiMdly rnndc wilh strnight inhm1nl and cxlcmnl Ion.su· filtlni:; tl11'L'rtcls. 'T'lwrl' ri te scv­crol 11lnnd11rd11 of husc threiHJs having Vttrlllu!l J I白111clursnnd pitches，。nc of which is based on the Amcricnn Nri tlo110 I St创＼d目时 Pipe 'l'hrend . 日y lhc u1:1coflhi且 lhrcnd

$＼.＇巾s, NPSH, U is postilblc 10 join smnl\ hofl<:‘ ~oupllngs 1n 吕l~cs 地 10 4, lnch 1sivc, 10 ends of stnndord pipe hnvi ng 八rrwl'lcu11 Nnllnn.11 Stnndard cxlcmnl pip'' lhrend11, U目i ii吕自将oi;kcl lo scnl lhc joint. P<>r dimension日， Lo ier­nncc1吉， nnd gugln毡， i;cc ASME Bl .20.7.

1.3 Throad Designations

1.3.1 The types of pipe Uwcnds lnd uclcd in lhis Stnndnrd ni-c de国ignn tcd by apcclfylng i.n sequence lhe nomh＇日I pipe Hi础， nu111ber uf thrcnd1:1 per inch, nnd the lhrnnd series ay1T1bol ns follow吕；命27 NPT Yii睛·27 NPSC L仨14 NJ叮R加27 附例如·27 NPSL Decimal equivr1lent notation mny be subgtHutcd for

rrnctional pipe i;i?..e:i. For cx;implc

O.J 25---27 NYI'

Por lcfl-trnnd lfo'l.mds, ndd "l,I i” tP lhe desib'110Uon. For example

如:J.7 NPT- LH

Designntiomi without "U-1” will 吕i吕nlfy ri~ht瞿handUmmds.

1.).2 Ench of these letters I" the symbols h口s signif­icance at> follows:

N "" Nliltionnl （八mcrienr1) Stilndnrd

”··..”-,,… ·”,,,,.,. ,

阳市’／¢•1 ／＼~Ml ；，.，”’皿1阳、刷1忻州M toy tilR ＇＂”，，，，阳向刷刷11N,1M1:陆H画。阳Ju剑”’nf~P\ilWOlk阳””O/Ollnid V帆ll1lll捕II<.'<町回国阳m阳E

P .... Pipe T = Th.per S "" Slrn.ight C = Coupling I~ m Rnili11吕 Fittings

M = Mechrmic:ol L • t,ockrillt

1.4 Scaling (NPT and NPSC Only)

1.4.1 Mating Threads. Molin巧 threads should nlw;1y!l rn11h1ct on the thrc11d rlanks. The design tolel'­flncci; nrc 11uch thnl mntlnl) i:rc！付吕 ond ruut11 nrny clcnr, conlnct, or jntcrfcr℃（：：!I.IC Pig. 1 ）‘ Thi吕jυ＞int 附自n『‘lly surd, unless 口 Sl'.a ln 『1 1 ill ＼』sccl..

1.4.2 Sealant. Wherl' pr山eiurc•ligh l, lci'!k巾cc join ls nrc 陀quired, il i!l intended 1hn1 lhrcnds cor~f，υ111~ 1111; to lhiis Stnru.lrml be rnndc up wn•nch-t i创11 with n 1-1c11ln11t. ’lb pt℃V创刊 g:illlng dlll'ing inalnlln tion, lhc !it！白1白nl may hove l11b1·lcntlng propm·ties.

1.4.3 Tightening Torque. Due to applkntlt111-1;1>cdrii.: variables such as matcrinls, wnll thlck11c柿， operntl11gP『cssu.rcs, etc., no 吕uidnncQ is i;iven in this Sttmdard rcgurJlng joinlwlighHmin民 lorqu口， However, joi nt苗should be Hghtcncd beyond lhc hnncl-lighl cngngrml!nt position. Adv:u,cln吕 tho jolnt post hnnd-1 il)hl creates intcrforcncc bctWCL'll cxtl.'rnaJ mid intcmnl tlucnd fl Rn阳，producc8 n aeal (with thl! us巳 of u acal11nt), nnd helps prl!venl loosening of lhe joint. Owrtightcnlng m.1y be dctrlmt:ntnJ lo the seallng f1.mclio11 of lhP joint ‘

1.4;4 Other Consldernllons. 。υt-of·ro~111dness of mrtting pnrts c;m ncgnllvcly offcct their ability lo $(ml when mnde up wrench tight. Tho product、 clmiUcily

nnd duel ility will Riso nffcd 5et1ling.

1.4.5 Pr回sure-Tight Threods Without Scahrnt. Pl1~c lhrcnds designed for pressure-tight jointi; that m<1y be Ulll:ld without scaling compounds (t:>ryseal Threrids) ilti! CtWl!!'f!d in ASME 61.20.3.

1.5 Appendices

Useful find RUpplernentnry informi:ltion. thnt is not o l'arL of this Slnncln时 ill presented in n IiOl'\mitndalory i'lpp臼时以. Speeifkally, U1c nonmand11tory oppendiccs Eυvcr thi.: turns uf engagement method of gagins, sug­g四ted prclhruadlng hole dl11mcturs, and nn cxplan111ory Gnging malTix.

ASME 111.20.1·2013

Fig. 1 Root, Crest, and Flank Engageme”L NPT

lntornol Thruod

E11tcrnnl -1 lmmd

1.6 Reterenced Standards

11、e lolcst lss11i.:!I of llw follnwins documf!nls furm n pnrl of this St川1.!Ard lo th~ Cl(lf.mt specified herein.

/\SME Bl.2, Cages nnd Gnging for Unifird Screw Thrcnds

八SME 01.7, Scl'C'w Thre,,ds: Nmncnclnt山巴， DeClnilions,

nnd Li!ltf.)r Symbols ASMI? Bl.20.3, Drysc.11 Pipe Thrends (lnch) ASMI! 131.20.7, I l o.、e Coupling Screw Thnmd自（Inch)

八SM巳 ~J .30, Screw Thro目ds: Stondard Prncticl! fu r Cnlculnling .incl Rounding Dimensions

/\SME 317.1, G.1gc Blanks

Publisher: The 八mcrlcJrt Society of Mcchni、Jen i

Hnninccni （八SM町， ’TWo Park Avcrmc, New York, NY 10016-5990; Order Di.?pnrtm~nt: 22 Law Driv1.·, P.O. Box 2900, Fnirficld, NJ 07007-2900 (www.:isrr1c.0J'吕）

1.7 Terminology

Dcllnll ioni; of terms mid symbl)l!I for thrend dinwn­sions nrC' given in 八SME Bl .7.

岛曲’QI•A!l'.4f h嗣’”I-向。，“阳I i,, 1118ulldfl~•幡....1nN1Mt ，如...，.... ，‘剧’确制阳？”OllW>Q ＂＂＇霄俑辆0 ................阳m”呻

2

2 AMERICAN NATIONAL STANDARD PIPE THREAD FORM

2.1 Thread Form

The form of thread profllc specified In this Stflncl口rci吨hall be known ab the Arncrlc<ln NnllonJI Slnndnn.I Pip~ '1 luC'nd Porm (Hee Fig. 2).

2.2 Angle of Thread

The llnglc bc1wccn the l:lides of the lhrond is 60 ck毡when mco~urcd In an 胡inl plMe. The line bi::;ecting this 口nslc ls petpcndlculnt to U1c {IXIB.

2.3 Thread Height

The height of th巳由:irp v th！℃时， rt, is

11 = 0.ll6侃l2540P

when.•

f' -= pitch of thread

ASME lll.20,1-2013

Fig. 2 Basic Form of American National Standard Taper Pipe Thread, NPT

4”－11－~

＇~· 且｜吁

上工

Axl自一－1 S 同一一 一－113 I唱一一

Extorn剖 ThrooCI lnternnl Throed

3

CG仰蝠’11 AllMC I仿制酬阳晒＂＇刷id•d h~ I’1’”’l<l••l<iWI嗣＂＇＇＂呐~MB闹，，p叫“自酬。r酬附郎”。”1ml1lod WI问d陆酬帽 tiorn lii国

ASME B1 .2:0.1·20H

Poril 町mml'trica l utrnight 岳crew thr~nd with a 30·di!g f111nl< tmgl日， H "" cot tr/211 e 0.86602510H For n syrnmel· ricnl taper 阳ew lhrend wiU1 日 30-deg flank 1mi;Je nnd d111metral tnpcr c,f 0.750 In./ ft, /-J = (cot « - lim• (j hm c~）／'2.n ~ 0.86574320?. For nn B· pilch Lhrencl, which is the marscst stnndard tilpc:r plpc th rel\ ct pi忧h, the corrcss ponding valuQs of Fl are 0.1082179 i\nd 0.108巳32, rcspcc­tively. The dif(erencc of 0,000035 in. b剖ng !nsignlfic1mt, the vulue !'If H =- 0.86(}02.540P L『时ed for <.'i ll iili'<light 11nd t11pered thr骨且d哥 in ihis StAndard.

2.4 Thread Truncation TI'lc mnxi mu111 height of the lruf\ca lcd thrcncl, h (see

Fl吕. 2), is bilscd on fo.ctor:i cntr.:,rlng lnto Lhc m1mufocturc of cutting tools nnd Lh\: inriki内g of tight join t吕．

11 = o.ar1or

币1c cn::rt nnd mot of pipe thr<!nd11 白w huncntcd a 111inimum of 0.0:331>. Th日 mmdmum depth of lruncntion Iqr the Ct'CBt nnd ro0l of LhesC' pipe thrends will be found fr11'Jb1c 1. The crests ru'd roots of U1c cxlcrnnl and lnl<'r­rfr1I U1rc且ds 1nay be trtmcnlcd either p1wnl1<.'l lo the pi tch line or pnrn lld tu Lhc .1xls. The llluslr;1tion In Tnblc J, givin日口 scctionol view nf this Stnnd;:ird thread fntm.; rrpros~＞nts the truncnted thrcnd form by n str自i~ht line 11ncl shnrp comPJ'll. 1 lowcver, n radiu日 form it; ncccptablc, 11s IC>ng ns the crests 1md roots lie within the limit!! 11hown ln 'lhblc I. Some of tho tnrnc口lions In lhi:1 illustration nrc shown with dolled lines ns rndii.

3 SPECIFICATION FOR TAPER PIPE THREADS, NPT

3.1 General NPT jcilnts 1nnd~ L11 •lt:cnrd川cc with these spcclf!cn­

tl\ins cnni;lat of an external tnper ond Internal tilpi;r lhrend （~ee Figs. I lhrough 匀， NPT tnpt!r pip<! lhn:!ild!I a.re intended to be mndc up wrench-light imd with n scnfant when 0 rrt.'SS川仔tigM j。inl is req~1Jred .

:u.1 Notation， 白、e iilnndnrd notalion :ippllc拍］Qto the Amcricllll Nollomil Strmdnrd Tnper Pipe Thruf时，

NPT, Is shown In Fig. 3.

3.1.2 Symbols. The following 叩mbolll me 挝peelfie to this St11ndilrd:

/) "' outside cliiuneler of pipe 80 = b11sic pitch dinmcler ot smnll end of extcmol

throml (or l}nd of pipe) E1 ;; bask piteh ditmlcler nl plMe of lumd~tight

engngcrnll.flt lungth (L1), axternal thread, one! ln屯U 已nd of Jnt~rnal ilirm1d

E2 • bi'.1岳i i: piti:h di~mewr ot plane of offcdivc U1rend len~由（L2), cxtemnl thrond

E~ "' baiiic piich din meter ut plane of wrench~tight ensQgemenl

115 = basicpit"1h diametcrpipe ;:il L.r,, pl11ne of CClrn­plclo thread .length

Co町rlO叫MIM( Int’”唰剧’而PIQ'IUlPll ~1 II阳‘.mdor .. •n .. wn帆，阳闸『1”。帽凹叫咱向内剧’..,w帽’11101101ml111时wilhoul ~＂＂＇＂＂ loom Ii呻

4

Ko = bnsic ml.nor diameter nt small end of exlerm1l thread (or and of pipe)

L1 :::1 hmgth of hi.md· t-lght cngil吕emmH between internal t1ncl a具tl't1i.111 threada

k = lenglh of effective threi!d, exterr111I thrc.ad. Equal to 1..1 plus wrench make-up threads

L:i = length of th.rend beyond L1 nllowing wrench­llght engagcme.nl, lnlerr\111 thrend (nlso, wrench make-up)

1"4 J:I overall lcni;Lh of thread, lneludlng vanish thre;1d，但term1I thrci1 cl

句＂＂ lengM1 u! cnmpl~tc threild!l, externnl ~hrcnd, where cone of mojo-r diarnetcr i11tor:;ects nu• 吕ide di11mcler of pipe

V = length of vanish threads

3.1.3 Handling Considerations. The pn1entlnl offccts on lhl'cnd ror1明 nncl gAging mu11t be conliidered when choosing coal ings and other processes. Some processe:>, such 阳 b臼rrcl conting, con be dnmnging to the thrc11d form, ~spucinlly lhc crests o{ cxtcrnill thrcnds. Sec pnro. 3.2.3 M nngi 1＇日 nicked threads.

3.1.4 Form of Thread. The form of tlw threncl ls 国pedflocl !.t~ pMo. 2. L

3.1.5 Taper of Thread. The bt111ir tnpl'r of thl' lhrc11d ls 'J In 16 or 0.75 in./ ft mP11s11rcd dlrim<!lricn lly rt!lnllvc lo the nxls.

3.1.6 Pitch Dlamotors of Thread. ’rlw bruik pitch din『n~terH of the lnpei℃d th阳。d arc ddcrminod by the fυllowlng formuloi; bru;ctl on lhc uutsidc dinmctl·r of Lht: pip11 nnc:J lhl' pitch ()f the thrcncl:

wherl'

l~o = D - （（）.（）胃口 I• 1.1) l/ 11 ＝ υ － (0.0SD + 1.1 )P

lj ＝ ιo + 0.0625 Li

D "' ouh;lde dlnm!!lt!r of pipe £0 = pitch d iAm口lcr of lhrenrl nl end l)f pip!! or

small end of exter1111I lh1'Cnd E1 ;;;; pl lch dtnml'ter of l'hrl'11d 011 the lnrge end of

iriternol threocl Li • hnnd~Hght Jen吕th of CJ1吕a后l'mcnt between

extl!rnAl 目nd intcrnnl th陀ads， 目恼。 the hand· tight length of thn.md for btHh internal ruid e>1lern11I threads

rt = thrcm:!s per inch

:u.7 Longth of Effective Thread. The bnsic length of the effoctiv0 mcternnJ tnpar thi-cncl 句， is cl et c.rttl ln cd by U1e following forrnulu bo\sec;l on the outsldo dinmctcr of lhc pipe 11ncl \he pitch of the thread:

wh<?ru

L-z "" (0.80D ·I- G.8)1 I /I = (0.80[) + 6.B)P

。 ， 口utside dl.imctc.r o( pip{· 11 "" ~hreadi; per Inch

ASME 111.20.1•2013

Table 1 Limits on Crest p nd Root Truncation of American Na tional Standard Eλternal and Inte rnal Taper Pipe Th『eads, NPT

Threoda/ Inch, n

27 1ft 111 11.~

8

ltalcht or Heigh! of Threod, Min,

Shorp \I' －一一－

lntu”’”I Thrund

Ex1ornnl Thrond

丁runc111ton. /

Mo比

Equlvalcnl Width of Flot, F

Min. Ma皿－

Thread. n Min. Mill!. Formuto In, Formul四 In. Tolerance Formula In. Fo『『nula In. Tolornnco

2 3 4 s 6 7 8 9 10 11 12 13 14

0.0320750 0.02496 0.0:19(.J O.OJJP 0.001 l 0.096P 0.00)6 0.0024 O.OJBP 0.0014 O.lllP 0.00冉1 0.0027 0.0481125 0.03833 O.OM146 0.033P 0.0018 0.088P O.OOll9 0.0031 。，031!P 0.0021 0,102P 0.0057 0.0036 0.06 18590 0.05072 0.057111 O,Ol)P 0.0024 0.018P 0.0056 0.0032 0.038P 0.0027 0.090P 0.00611 0.0037 。.0753066 0.06261 0.06957 0.033P 0.0029 0.07)P 0.0063 0.00)4 0.0;38P O.OO)J 0.084P o.oon 0.0040 0.1062532 0.09275 0.100 o.onr 0.001.1 o.062P o.001a 0.0037 0.038P 0.00~8 0.072P 0.0090 0.004:>

Gt NERAL NOlE: The basic di『mmslons or thl! Amorlcun Nnllonnl St~ndMd Ti1p1·r Pipe Thrcnd 西r~ given In ll'ches lo lour or nvc dotlmnl places. Whlhl thl5 lnipllos o grootor dogrcc or fl『eclslon lhgn Is ordlnnrl ly ottnlned, these dimensions are the bMls or KllBU dln1011slons nnd nre so e且pressed for lhe pu『pOSQ of ilfimlmrilng ll仔岳阳 In ~omputnllon~.

5

C.'f'y.v咽，咿唰帕恻楠”’价4酌”由蝇。即制咱凶”刷＇＜•佛”WlhAJME”。”j>l(ldw<l"ll酬M阳....喻’四刑嗣付酬阳付树，帽”阳m””

·’ .·

ASME Bl.20.1-2013

Fig. 3 American National Standard Taper 阿pe ThrQad Notation

问－ Ld _.,

L2 V 一』

h画啕 ~5

Wrorioh rnnko-up- ,

问唱－ l.3 一，｜唱 L,

1 i !11 !Ii H

l

H J ~ ‘·。.

~ ~ £ ~ ! .,!!! 也酣e

Eti Ko Eo ,., 。

6

Co仰，刚11 /\BM［阳·町、，1阳咽lP酣蛐dLy 1119 ＇＂＂始’“国刷刷翩翩翩阳r的，)lod11IJllOO OI nt•IW例崎IHl!m刷n~刷刷””’...町。”’ lilP

ASME. lll.20.1-2013

Thi昌 fortmtlu clchmnine革 thl! lcn吕由 of llifoctlvc cxtcr· nril tluend. This mny include two u:iable thtoutl国 incum·

plete at the crest.

3.1.8 Hand呈·Tight Engagement Between EJtt岳阳al a1nd Internal Tape『Th『臼ds. n1c bnsic length of engngemcnl bctwl!en cxtc.rnn l and llHcmnl t;ipcr lhrr:口ds whc11 sen:?Wod t·ogethcr hand-tight ls L1，在hown In column 龟Tnble 2.

3.1.9 w『曹nch·Tlght Engagement Between Exter!'lal and Internal Taper Threads. The extemnl lhl'ead i四g;th,句， L1, :md lhc lnle1「nnl thread length, L;-., nre nUciwnn.::es ror wrcnc.h· tight assembly nrtcr the h:md-1lgh1 c1.1gage­mcmt or L1 ltmgths.

3.1.9.l Thread Engagement Considerations. The gaging tolerance of :1.1 turn fClrboth extemnl and internal threads hos the er.feel of pol的'ti i nil y inc陀asing lhe length of cng1.1gcmcnt by up to two turns or reducing lhc leng th C>f engag已mL•nl by up to two 1urnr:.. Working gage wear hil自 th<: nddillonnl cffod of reducing th rend ongngcmcr\I by th日日mount gni;efl wc;ir pn81 b白sk.

) ;1;9.2 Speclal Appllcatlons. JL ls rccognlzcd lhnl In t1pcdol npplicoliυJI苗， such fl目 flnnges ror high-pressure work, lunger thl'l'nd engil吕ωηonl i届 11ccded1 lti which Ci'll:l口 tho p!kh dinmetcr (dimun再iotl £1, Tnblc 2) li: 1nni11· lnlnccl nnd l'hc pitch dlam1;?tt:r Eo nl tlw ~n~ of the pipe ii-;mnd目前mnller.γhe ttip!!r mui;t be kepi at ·~ in. / fl, ant.I thrcnd is ma.de lcmgc民

3.1.10 Tolerances on Product Taper, Lead, and Angle. 111c pcrmlsl!lblc vari11tions in t<lpcr, lc!ld，。nd1.1nglc nre given In ’Ibbie 3. Thill tnblc is 11 Huidc for cstnbllshlng limits of lhc lhrc以l clcmt>nls o( thrc111.Hng tυOIS, 'l"he CUJ'rccl m011tJfnClUl'U Of louts nnd the llSC or 吕白ges should pwvldc ndcq11ale conlrol ur funcllonal t>izu.

3.1,11 Basic Dimensions, The bm1ic cllmensh.ms of taper pipe 1hreads1 derived Crum the nbuv<' specifica­tions, are given In Thbk 2.

3.2 Gaging NPT Th『eads’fhe L1 g11i;e11 prescribed in thi自 St:tndnrd ore Ctins id·

ered functional in that tbey givi: ni;surance of a!jsi.:ml>la· bi lity over lhe 1~1 length, lhc length pf hnnd-tight engagemcnl. They sini.ulate a mnling producl lhrt>nd that coniorrns to this Stnndnrd. They encompass mYWple clcmCftts of lhc lhl'cnd, Inch』ding lhrc:id dl:imctcrs, flank angle, load, la per, and root tru1iea I io:n. TI1c simultaneous engag1:?1tll!l'il uf a日巳ll:!rrnmts rcsulti; ln ii measurcmmtt Uuil rclli!tbl th(! curnulativl! variation of all thosl!‘!!le· rnent器， the functlomil diamoter. This is ~xpr凶Sl!d 国s

stMidnff for rings and plugs or rnl!MUrcd dlrccUy by inditilting gil吕t!s. St:'e 自cction 7 for gngc 1:i)Jcdflc•1tlons.

3.2.1 Ext曹rnal Thread Gaging

J.2.1.1 乌 Ring Gage. ’rhe L, ring ;.md exlemnl product lhrcnd n1'e screwed togetht>r hl'lnd-tight, Rnd the

Co1oyrlql1t A~Mt lfll•o刷刷。”’瞄(•n，鸭J11d hy lllff o＂＇曲，耻””皿制帕，啤MU”。捕归耐＂＂＇灿Ol n•r..耐M咱陋，m•lr刷刷’阳＂＂＇”的圄llOM IHB

7

po吕it lon rdatlvc lo the sn1ul1 end of the rlng (or basic slep m1 t1 stepped ring gage) is ttotcd (sec Figs. 4 nnd 5). Thia, ii; th日再tandt)rf. The toll:!I'<1 nee foi「 the standoff is :t1 tum (or 占1 pitch，叫 sh。wn in colur'nt\ 4 11f 布hit! 2.) from lhe smnll end of the ring (<ir basic: 吕tep o.n a stepped ring).

言，2.1,2 Extemnl LJ•lndkotlng Gage. 11'1~ l'Xlemal L1· indic:nting gns~ is set with <i m且st~r plug gage, which is mnde to bnsic ciim~i;ions. Accordingly, wh~1 由tproducl is engE1gcd by 目n i11dicnling S目8日， readingg h\di‘ 四le the dinmctrnl varintion from basic. TI1e tolt~ranc~ from bnsic is lhc dfomclr1:1l Ci.llJivnlenl to :i:1 pilch (or 主0.0625/11, as shown in colum11 23 of 'Thble 2).

3.2,2 lnternnl Thread Gaging

3.2.2.1 L1 Plllg Gage. The L1 plug g<1ge and inter­tml product thrcntl nre screwed together hond· light, nnd the positiun relutivct to the bush： 且tcp llf the gngc ill f'lol·巳d(see Fil~日， 5 1mcl 6）， 节、i剖 is th心 slundof（‘ The tolcr~ncc for the stnndoff is 尘l h1rn (or 土 I pitch, ns shown i11 colurnn 4 of'ftlble 2) from lhe hnsic 11tcp of the ph.1g 1311gc.

3.2.2.2 Internal Lt·lndlcatlng Gage. n世 lntC'rnnl t1 -indic:ntlnu 拓n归u ii; i-a:t with u rru'l~h.!r ring gn吕c, which is rnnde to b.isic dimenaions. Accnrdini:;ly, whc:n the !”’oduct is t!问：ugcd by 11n inclicntin~； gage, re:目ding11 lndi· Cfllc the dlnmctrnl vn rinHon fmm bnHic. The lol<!rn'r1cc fro『Yl bosic is 1he dinmclrn l 叫uivnlcnl lo 在l pitch (or 尘。.0625/11, ns 吕hown In cllh1mn 23 旷’()Ible: 勾．

3.2.3 Nicked Threads. Pipe ~hrcr1 cls n1·c pr1rllculnrly 11uaccrt1b'Jc 10 dnmn吕C lhot i『＇ tcrfcrcs with propc1· gng· inll· Gonernll头 Lh l日 tfamn尊心 nppea rs us “ nicks” on the Cl曰“ of ~.x ternnl ur int"1rnal thrcnd!i. These nkk届 wlllnlwnyR hold lhc.: goge bock from properly s1mHn~. l'hls mokcti lhu cxtcrm1J fo11ction<1l i;iie 1ieem hrrg日r thnn It is nnd lhe internal hmrllonnf size i;cmn smnller tfo:1n it 恼， fh:cnusc pipe lhrcAds fl l'C' designed to O•! inst11Jlr.<;i wrcnch·llghl, and the wrenching l'Cforms the nicks lo their proper er出t po吕ltlun，由me degree of nkklng lti fltCl!plabll!. A product mated with a gage m1.1y be " rapped" nncl hAncl · tlght!!lil.ld while r.mgo吕ed. Care sho\! ld be c:xerch:1ed whim rappinl~ to miniotlzc the pol四tial d11m11ge to the 8"Jie· Rnpping and ti阱tcningmny continue until the product find gage do not enf~ag~ nny further. Produc1:1 l'hat remain beyond th~ !}'lging to lcrtrnec ofter rnpplng nr1d hnnd-Hghhming are rmncon form!J1g.

3.2.4 Trnatment of Chamfers, Rocosscs, Counterbor臼， fhre<ided pwducts hRve thr1;1nd ch&;1m· f凹唱 to avoid slu1rp edges, protect lhe 11lnrl thread; and ald In assembly. 丁1ie rn1 lure of threads g四erally necessi­talcs cxLcmaJ chamfer diameters 1.1l le11sl as s1m1" 11s U1e minor dlomcler and lntcrnnl chnmfor clh:imclcl'!~ nt lcnst ilS IMgc as the m白jor dJrunctcr, if complete sharp edge rem口val is desirucl. ln prilctlcc, rnany product thread Chflmferli exteed lhc mifl1mi.'i1 chrunfl:!r U~i.'i l r巳moves the

ASME !ll.20.l·'20H

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9 ··..

E何'Yfilih•MIMe阳.，，阳恤，国P怖，1阳lllly ll曲 un嗣r llCwilH IMm M l.Ill 阳”f"OO•K.ll<lnor俑’V耐‘同 P<rm.11附州阳d’nnM l1nmlfl6

ASME 81.2'0.1·2013

Table 3 Tolerances on Taper, Le时， and Angle of Pipe Threads , NPT

Toluronto1!1

Th rends/

Ti!por •m Pitch Lin毡，YA ln./ rt Li!~ tl lr1 Erre~rlve.

Nomr『ial Pipe Size Inch, n Milli. Min. LCtngth or Thrni!d~

l 2 ) 4 s

沁~：：＇弘弘引l 2'1

非中＆3泊:" t‘ -Y1~ •0.003

Hl －坷%6 .t0.003

14 ’ 暗 •O.OO:l l, l比 l '/2. 2 11.S

+, 比民 －~~~ t0.003 21h and lorm.1r 自 - 6 a日，00) INCi!! (1)1

NOTE: (l) The tolcmnco 011 1cac1 511011 be t口，003 ln./ln. on PllV size lhr!!adcq to nn effect忡。 lhr!!nd lenglh g『enter than 1 Jn.

Fig. 4 Gag ing External Tape r Threads With L1 Ring Gag~

Ono turn largo

Rln目 g11日E

One turn emoll _ ....

6ii·deg Angle of Thrcnd5, ocg

6

•ll/2 t2 im.2

~iY1 比主1

. .....

1画i Sn&lc S!zo (b) M画;Umum Sli o (c) Minimum Slzo

1()

R何pv，、。” A!l>.!I 叫....,., ..... , ，.，.，由111(1 hy Ifill ""'lur ll<•ntn Wllh ，＼~Ml ’相阳””..，.. ~＂＂＂ or呻IW1•11np ••1mH协dw11h＂＇＂＇＂＇＂圃，睛” Ill她

. . . ’ I

In) Chnrnforotl Exturnnl f hrootl t>f Q1111lo SI协 With Chu睛’“r。llunotor Smnllor l llnn

I.ho Minor Dlanmt由F

(c) Ch回mfored Externnl Thrond of Basic Slzo With tho Chemfor

Diameter tho Some os t ho Minor Plomoter

GENE~L NO'lf : See p~ra. J.2.4.

en町’悔！”《ll"4r I刷刷刷I翩翩“阶回时•Ill刷 l•y 1/1\lu刷刷，r＂＂＂蛐w.111MMr””a归国1胁，n阳阳’相h问阳””川

ASMI:. Bt.20.1-2013

Fig凰 5 G11glng of Chomfered Th『ends

Point of lost thr由od11crotch.

Gvo1i10 Jnco

1.1

lb) Cho阳forod IMor1111l lhroud 。f llr\:;lc Sito With Chumfo『

l;xcoudlnn thO Mujor Olo ’”’沈阳

(rlJ Chnmlorod lntornal Thrnl1d 。r Soslo Siio With Ch自mtorDinrnotur tho S11m11 匾垂 lhn

Mnjor Diomotur

Pofnt or l砸自＼ lhrend s口rutch

l\SME 81.20.1-2013

1 1 t t 』t 1 ,.,

Fig. 6 Gaging lntomnl Tape『 Threads With L1 Plug Gage

One turn 1;1mall

1自） 8”’le SI且曲

One turn lurgf)

一计

lb) Mn>elmum SIZD

i;hnrp ed!)<' to better ensure sharp edge rcmovnl. The ~·xl5lc;inco of chnmfcra hn:; lho cffcet of rcdudn吕 c11gn~cdthrcnJ lonulh, nnd lnru1.1r chnmfcrs further rcdt』CL' lhrcud length. υ附igntirfl nnc;I mnni,1focturc1·白白re therefor!' cou­tloned lf1 l11kt1 Into rontildCrillfon llw’ 1.!ff~ct妇。f ch.irnfl'rs on lhc liill'ndrll nsscmbly. 'rh口 goging 『口forcmr.c ptlint for n product lhrend depends on the chamfer clinmetcr.

3.2.4.1 For un cxtcm<1J lhrcnd wHh o chnmJcr dinmrlPr sm.1llcr thnn the minor ditHnctcr, the rcfctcncc point is tlw lilsl 11crnlch of the chnmfer cone ltiec Pig. 5, Ulust roll on (o)].

3.2.4.2 For .m lntcmnl lhreild wilh n chnmfor cli.1mctcr lnrgl'r U削 the mnjor cllrunctc巳 the 时crenccp<>int i启 lhl' In吕t scratch of the chamfer cone !sec Jllg. 5, llluatrntion (b)I.

3.2.4.3 For fin external lhrcild wilh 自 chnmfcrdlnmctcr equal lo or greater lhnn lhe minor d inmctcr, the rcfcrcncl' point ls lhe end of the fitting !or pipe; see Fig. 51 llluslrnlion (c)j.

3.2.4.4 f1ur M ll'ltcrnal thread with n chnm(er diamet(•r eq11al to (it i>m白II~r thnn the mnjor dlnmetc巳lhe rcrerence p()inL is the 凶d of thl! 阳hig ［画t:!C Fig. 5, ilh111tra\lon (d)J.

3.2.4.5 Hcccsses and co ~tnl erbores inu llt be nccountcu for when goging internal lhIP11di;. Dogppinti; or lcnd· irlR to cxtcmnl threads must be accountrcl for

E回到V’‘j!i AOMll I＂＇剑，...，啪”aP附唱“四”IS刷刷御仙”恻lti灿Ml

Hot<t阴阳’阐1”‘唰阳＇＂＇睛’唱’唰’””件””协唱"4k-•kw啊，，，s

le) Minimum Size

when gnging rxtl•rnnl 1hrcuds. These (caturL'S must not be Included in lhrc:id lungth m11n1>ur~mc11ls.

3.2.5 Acceptance of Product Mode Prior to This Revl­slon. 1l1ls rcvlt1ion inC'luclc:i chnn吕ell to 也n吕In吕 prndlcc,spcdflco lly lhc ch口J1gfng nf lhc gaginfi point nf rcfcrl'11cc for cxto1·11n l lh1’cods having clmmfcr dinnwtcn1 !lrnnllt•r thnn the minor tllllmct巳r I'l l the smnll end. 'l11is chnngc iH an hnporhlnl odvoncc nnd should be Implemented upon i:isuancu of this Stum.Jard. 八s luni; ns Lhcrc arc no spcciflco lly idl.'ntlficd a州cn1bly Is吕ucs, pruJucl11 con­fol'mlng lo lht' prior revision of this clocurnc111 nrc con· sidcrcd sultnblc on<:l 11Jlowed for ~nlc ;ind ncet·ptm1cc unlll dt'plclt'd,

3.2.6 Co四ted Th『eads. 'fhe :;prcificotioni; in thlH Stnncfa时 do not Include an ollow:ml·e for ∞州ng (nr plntln也）. If contlng Is desired, it mny be ncccssnry to modify the thrends since !he gaging requlremenls must be 1mti11ficd for coaled and LlllCuatcd parts. 节甘s mny be cmphnsized by addinl; the wutcls ” APTER CO八TING”lo lhc thrend d~11i伊丽lion of the fini吕hcd product. Gage Hmlts before coflling may be sp四日时， followed by U1c words “日EPOHE COATING”。r "PRE-PLATE."

3.2.6.1 Co矗l111g Buildup. If Rignifi~;inl, i1 c:cmtJ,ng buildup w!ll necessi tate mnking l'Xlerm1l threndi; i;mnllcr trnd Internal thtullds larger, so lhnl 11rt!i'r conting, thread sizes f\l\d gnghig arc conforming 10 the Slnndnrd, 11 i:; importnnt to noto thnt coatln吕 buildup on lhe rlilnks of

12

ASME 81.20.1-2013

lhl'et'!dS inerellS崎 ~xtcmul thn~nd pllch diHm~tcr slzci; ;ind rccl1.1ces in(ern且I pitch cliilmeter sizi,.•s by four ti.mos the cm1LLng thickness. Coalins buildup lh cr:ei;ti:; Dnd roo ls inc1•cases mnjor diameler si:les and decreases minor diameter sizes by two limes lhe coo ting thicknes::;, See part\s. 3.2.6.2 ;:ind 3.2.6.3 for gukiance OJ'l compQmrnl­Ing for uniform contlngs. Mnny product coilllngs do nol coat Fe口tmf,!l;i evunly. lnf~1rn1aHon abuut coating buildup 岳hould be obt.:iined frorn the coil ting processor.

3.2.6.2 Precoatlng Gaging Stando仔臼mpensatlon,lntornal Thread. TI1rcnd gaging stnndoff tolcrrmcc may be ndjui;tcd to cornpun11ate for n uit iforu\ conllng w Ith an 11ppcr and lower thicknei;i: tolcruncc in the fullowin吕π1目nner:

EXAMPLE: Y:-14 NPT lntcrn11l thrend with uniforrn 1:011ti11g lhlc:knc~~ uf 0.0002 h•. to u.OCKH hi. /\ft1n co~Hn且， flfln l procluct lolcrtmcl! is n1ltih 士1 tum stnndoff. IJclorc conlin1;1, l oh·r白内cu is 即t11bll,1J;.,t1 by ihi! (olluwlng fufrlililll:

Lor肘。nd of rroduct IOIL!l'nncl!I I 111m lnrgl) 1 (minim”m coot ii、吕 1 hic:km·~~ x (i(l-dog 1l、民•fld

co"otnnt )( tnpo1 stnndoff cmlhhrnt) or 0.07111 111. lf1rAc + (0.0002 In. x '1 x 16) 0.0842 In. lnruc

Smnll ond of prnc1ucl. tolornncu: I I U11 1 咐’“’II - ( 111 1阳l111uu1 co11th1g lhkkn山N >< t\0-Lkg thrend

cunt1111n1 >< l(lpcr 1111mdorr co11~11mt )

or 0.0~14 i1’ . 111111111 - (0.0()()il 111. )( d 到 I 6) - O.Oll!JI! \11. mnnll

Cnlcu lnt~<l l:ldorc coulhl!\ llhmdoff lolrrnnl'C: O.tltM2 In. lnr1w I” 。.01158 111，剧，nnll,

’Thrc刊s with r\Onunlform contlngs or other re月idu!'l leffects (like nkks) may bavc lo be compcmmtcd for di仁forc11Lly lo l1bt.1ln stnndard ,1 ftc俨coating loll!rllnces.

3.2.6.3 p『'tcoatlng Gaging Standoff Compensation, External Thread. Tim.mu gaginn :;.tm1cloff loh:nmc~ mny be ndjustcd to compensate for a uniform COAiing with 1.m upp1:r “nd lower thickncs届 tolcrrmcc in tlw followiing mnnnct: EX八MPl.ll: Vrl4 NPT 1，坦！..： rnn l lhri:atl with uniform eontlng thickness or Q,()()02 in. to 0.00（间 ln. Mtllr ~o自tlnB, finnl produ~t t0Ji,rnr1e1• i~ nu”h ;:1 lL1m Rlnnfloff. lli!flll'e co川lni;, toli.>rnnro Is cstnbllshcd by lhl' follDWing formY ln:

Sini、II 但ntl O( 1t1J1>r11'\Cv; 1 Lum 画m.111 ←（mlnlmum coating 1h1cknL'S& x tlO·dcg lhrcnd

eOl)!llPl'll )( hlpt:F ~（民nuoff E口1i~tnrit)

。r

0.07111 In. smnll + (0.0002 In. X 4 )( 16) • 0.0842 ln. smilll

Lnrge end of lolcmmcu: I l\lrn l~rgc - (mnlllmllln co111tng lhlclm凶需）（ 60-Jeg lh1'1!i!d

comiinni x ln阳r 吕inmloff c:onMlnnt) 。r

I).仰lJ in. l11 rs11 - (!l刷刷 111. x '1 x 16) = O.MS8 ！日. I且『萨

C11k:ulnte<l t、！fore CQrtllflg Stdmloff lOll!J'll.flCI!: O.OM2 I内. smilll It> 0.04511 In. lnrgr.

C咐，Ill＂＇＂＂＂＇＇＇＂＂＇睛’阳“阳呐时叫hy lfill1m.l•• I阳＂＇＂胸llhA皿v陆”””’四川刷刷刷刷‘崎1M11miliBwili时阳恻flu胡同州

13

Thrcndt1 with n011w1iform conti1igti nr other reAidual dfocts (like nicks) may hnvc to be compensa ted for clif­forcnLly to obtain stcmd:ml .i£Lcr-co自由ig tolerances.

3.2.6.4 Prec:ontlng G:igos. Spedal modified ring and plus gni;ei; rnay be dei;igned illid Uiied .In place of the stnndoff CQmpens1:1tio!i methods dl!!:;cribecl nbov~. 'I11ese 盯e based on U1e stnnd1ud gE!ge5 desc;ribecl in ~edion 7. I ~ is common lo modi守 lhe gnge diomtHen1 such lhnt lhe plug’s b11sic step and the smnll 1md or U1i:! rtng nrc nush wlth product threads thot m·e al o enmp!!,nsal~d bosie sl.z巳. Formulab slmJlar to those' ::ibovc mi'ly be Liiied in nrriving at modified 回gc 匾izeι

3.2.7 Supplemental G矗glng Conformance to thii; Stnndord l'l:iqult·cs lh11l nil bnsic design dimcnsiom1 l:ie rnct (within npplicoblc tolcrnnccs), including ll'lpcr, thnmd trunc;;\tion旨， lead, tmd th rend flank angle over th巳1,,_ nnd t3 hmj;lhli. SincQ thu gaging sy1Mms pi'cSC'.tlbcd in thls Stflnd!'l rd m11y not ensur(1 conf(.lrmane1: to t h凶口

Individual lhrcml clt'm1ml日， supplementnl sn1:1•nu m11y be cmpl,>ycd to cvnluolo conformance. When suppl!'­mchtnl gnglng is employed, it shnll be ngrceci upon by lhc 11upplicr nnd purch111;c1·. It ls cotnmon l<l mi.:asurc lruncnlim\ t•quivnlcnl width uf 门。t (Tublc I) by opllcnl 1:>rojcction of extern川 thrcndi; directly to dotc1•mi11c wlwtlwr or nut t111ch lru11c11 Hun1.> i'lrc wlthln the llmlt昌spccl!lcu or pal'ticul<wly ttl sec thnt rnnxlmum trum.:nH1m Is nol axcucded.

3.3 Acceptability

'11mmcl gogcs m11dc 1n thi!i Slonda rd will hove: val'ia· lion bl:lt ween I hem clue lo gnge m11m1focl~1rl11g tohmlnccs nnd allownblc g<1ge wN1r. 1'hr.rc cnn be rnore vti rinlion In tapered thr℃nd gnging than slrnight thread goging di1e lo lhc lrilcrph1y or lhc tnp巳r vnrin l ion日 （wilhin tolerance) between gn日cs nnd products. The (unctionnl grigin& rcquire1m~nt ()( thl!i Stnn‘~nrd will bu met when the prod· uct ii; t1cc:eptt!tl by ii 例gc thnt conforms lo this Standill飞~.fl ls ncknowlcdsed thnl th自目llownblc dlffi.mrncl!s Lii con· Com1ing gnges mny produce wider rnnr1cn1 of pi·oduct dimensions thrm wm1lcl be construct~d slrktly l.iy the lh陀口d drawings and tolerances. However, pl'oducl func­llcmality nnd Into:陀hrm吕enbillly nrc ulllmntcly mel using these gages,

4 SPECIFICATIONS FOR INTERNAL STRAIGHT THR且OS IN PIPE COUPLINGS, NPSC

4.1 p『·essur~Tlght Internal Straight Pipe Threads

'l11re11d~ mnde in nccotdnru::e with these spcd(icntioris are straight (pnrallel) lhre目ds of U1e snn1e 由read fot.m ns lhe Amcricnn Nation罚i St<1nd11rd Taper Pipe Thrend specified in pnrn. 2.l. They are used to form p「essu.r~

tight joints when assembled wiU' Hn N内吨 exlermiJ tnper throod nnd mo.de up wrcr1ch-tighl wiU' sctil11nt, (!'lee pnrt1. 1.4).

MME lll.20.1·201)

Table -4 Dimensions, lnl~mtal Straight Th『eads in Pipe Coupling, NPSC (Pressure疗lght Joints With Sealant)

O.D. Pipe, Minimum Minor Pitch Diameter LNote (l))

NOlillntll Pll>il Size 。 fhrcQds/lncl飞 n 口lamete『 Min. Max.

l 3 {j !i 6

口，4日5 27 0.31J0 0.3701 o:m•t 。，5110 18 0.4112 。.／if.164 。.4961!

0.675 18 O.Si'7 0.6218 。.63221;, 0.840 111 o.ns 口，7717 O.i85 l % 1.050 14 。.ns 。.！＞1122 。，9956

l.315 , 1 Yi l.l6l u;os 1.2468

~~： l.660 11 比比 1.&0G 1.S7n 1.5915 1.900 11 l.7ti5 l .8ll12 1.8305

2 2.375 11 1;, 2.2t9 2.21181 2.;J011l1 i＇／~ 2.875 8 2.650 2.750内 2.7139 J 3.SOO 8 3.277 J.3768 3.4002 3~ ~ .ooo 8 ).777 3.8771 3.9005 l1 ~.500 8 11.275 ,,,3751, /1,3988

NOTE: (1) n1白白ctuol plich dl11mo1or ol tho Mrnlghl 1nppNl hol() will be 'lightly smaller than the value 11lvon when Rilflcd with a iaper plug 1101:0

os spoclned In pam. 4.2.1.

4.1 .• 1 Thread Deslg阳tlon. Thr Amcrknn Nntiunnl St.IUldcmJ COUJ)Jlng Strnlght Pl肘’nlrends nre designated l.n :iccu1·clancc wllh pnrn. 1.3.1 fLS follows:

比』27 NPSC

自.1.2 Dimensions und Limits of Size. ’l'hc dlnwn· slom; nnd pitch diameter limit吕 υf t>ll!:c nrl＇ 晶pedfil•d in ’fobh: 4. Tlw pitch dimtu.!ler sizeH cc>rrcspom.J lo Lhc: g口总·ing toh.mince of one imd one·hnlf h ims lm:gc or 111n11ll of th1:1 NI对 F.1. Thu rnojor 11ncl minor diilnWtcn; vory with the pilch di11mctcr, al:l lhc American Nalicmnl Ston­dnrd Pipe 伽门ll凹＼d form is mointnlned within th画 ln111c::i­Hon lolcrnnccs shown lt1 Tnblc l .

4.2 Gaging NPSC Internal Threads

lnternal tnpl!r' thrend gng日S in ilC:cC)rclnncc with iiection 7 sh目11 b日 used lo gJge NPSC atrnlght it'ltC!rnal pipt: lhrends.

4.2.1 L1 Plug Gage. TI1c L1 p lu吕 肘吕c and !ntcmal product thrc<1d are !iCJ写w~d to1；~tl1巳r hi'lnd·light 口nd thi.: position relatlw to Lhe basic skp of 出世吕age l吕 nutud.This is the stm1doff. The NPSC tolerilnC巳 for the tit<tndoff is :I:］与 tm'fls (or :l:l~ pllch, 11s shown in coh1mn 4 of ’Thblc 2) from the basic step of the plug 吕i:ige. s~c p!!rns. 3.2.4.1 ttnd 3.2.4.2 for chamfered threads.

ι重，2. L1 Int琶rnal Indicating Gag毡， When product Is engRged in nn indic11tins gage set with 目 Ill时ter gage, renclings indicnle lhe diametrnl varialk>n from basic. 'TI\e tolernnce from basic is ll1e dinmetml eqiilvnlenl to .1:l马pitches (or :1:0.0625/11, os shown in column 23 0FT11ble 2). See paras. 3.2.4.l m~d 3.2.4.2 for chamfered 1hrends.

~·恤MA四”IJ IOl&l,,.l•HI耐

”’阴阳，t hylllUl!I'<’＆• ~”’咽lhA罪~o阳呻P刷刷11!11刷刷阳晒阴阳’”’阳“四1阳例11<,on,. lmmlil随

’14

CAυTION: Wh日，I using lilpllrnd thnmd S~ll削 in 川might pwd· ltd lhn~nds, nonunlformlty of 刚自由 wear 18 命 pnrlkutor problem; i hQrdor岱， li'l lll.'rl!d ll:\8~11 Ulil'd t价r I.hi~ nppllc~tlon ”huuld be chcck~d l>y direct mcnsurcm创刊。f thrcnd form nnd si~c 111 Pddi· ti刷， 10 d1etkl1飞）； Aj.1011181 a ’”n1111iι

5 SPECIFICATIONS FOR AAILING JOINT TAPER PIPE THREADS, NPTR

5.1 Ralllng Joints

R11Jlir1g Johllfl lhu l rcqu i陀l a rl民lei 1ncchnnlc(1I topt:r lh r'Cad Jolnl may be mndc wl山 cxlcrmi l nntl i11lcrnnl tup~r l'hr℃ad吕. The cxtc』·n11 I thrcnd Is the same os the Nl吁’ lhrcnd, l!Xcc1;1 Lhat II b; i.hurh:rwd lo permit lhl: USC! nr Lhe lnrgc.r Clid nr lhl! pipe lhrend. Thc.1 11Hornal thrnad hns !he s11me b11sic dimensions 1111 the NPT inter· nol U1陀aa; howev~r, a recess L11 lhe fillin自 provide!l 11 covering for the lnsl scratch or sharp edges of incomplete threads on 仙c pipe. The dimcnslons of U'cse lhrnnds 11re !ihown In ’li1l:!Je 5.

s.1.1 Thread Designation, Anieric口n Nntiom1l Stan­cln:rd Rlliling Joint 1a pc1· Pipe 'lltreads 归T df.>si~:;nnted in nceordancc with para. 1.3.1 ns follows:

!• 14 N阿R

s.1.z Form of Thr噩噩乱 The form of the th阿nd is the snmc ris the i\mc1·ican N!'ltiorn11 Stand11时 ’Toper Pipe Thread shown in Figs. l nTid 2.

5.2 Gaging and Tolerances, NPl'R

'rhe dimensions of thef!e threi'ids 白re 居pGCified In币blcS. Gaging is performed u串ins shmd11rcl NPT L1 gnges

Dim

ens'

ions

of

IExt

emal

an

d I

nter

nal

Tap

er P

ipe Tl

百reads

for

Rili

ling

Joi

nts,

NP

lR

(Mec

hani

cal J

oint

s)

Tabl

e 5

No

tch

＼刷阿

l11hre·

adga

ge

①

ill ~H Ut 11

〉 协 主 m E r M E － U F － M O － － u

Di's.ta白居

lιijg

;el

刷口ld

lCo盯res

Be1

ow fa

ce

of

f"llt

illg

, 5

'fn.

Thr曰“

Mfn

imw

m

l.en,

gth

, r

Min

imu

m

民ill

.or

R由自岳

111

Fitt

ing

, Q

l'i

mJH

b

u 』 日 ’

3

m 曲 E n n q －

M 叩 M t 耐 4 －

MU

tt

MaJlim哑自

II

lnromiiJ阳e

Thr四ds

du:i?

to

Ol:a

mfe

r or

D

i;a., v

in.

Th『臼1.ds

Mili

Xirn

vm

币。钮’L创军筒，

of臼立

e.11回

E

Thr

ead.

4

-t.

iR.

Thr

eaG

5

Le吨酬，

of

Eff

ect

ive

Th:

rezd

L

,-4

irt.

T

hre

ad

s

Shorte时ng

of

lhr唱

！ad,

4 i几百

1re刮

5

阿！di

Dia

me

ter

at

Ein

d o

f E

xte

rna

l 肝1read,

£.

5

He忌灿

of

Th

rea

d,

.h

Thr

ead

s/

rnch

,, n

0.10

. o

f p

,jpe

,.

。

....

. 」

i:..-.

Nom

illN

ll Pi

11e

Siz

e

1 1

8

is

u n 弘 E 叫 “

占 4 丘 4 4

l7

。..2

86

0

.28

6

0.3

4$

03晶8

0.3

48

~6

。咱25

0.2

5

0.3

0

0.3

9

IU3

0.8

6 l.

07

1

.34

1

.68

1

.92

0.1

8

o‘ 1

8

o~n

0.2

6

0.2

6

n b h u υ m u b h u

、 ，ι 电 豆 、 ，ι 咱 ‘ ， 、2

12

0.1

79

0

.17

9

0. 2

17

0.

.261

0

. .261

11

6..9

8 7

.15

7

.35

8

.13

8

33

10

0.'

99

0

.51

0

0.6

39

0

.70

7

0.7

2l:

9 '·"7

~.66

占.85

S.1

3

53

1

8

0.3

20

0

.33

2

0.6

n

＆毒品6

0.ι63

7 3 J 2 J τ J 唁 3 3 2

6

。.214

0.2

16

0

.26

1

0.2

61

0.

261

0.7

71

8

0.,9

811

1.2

29

9

1.573晶

l.8:

i!26

晶

0.0

57

1

0.0

57

1

0.0

6%

0.口696

0.口69岳

3

]4

u U.5

u

s

U..

5

2

口.84G

1.0

50

1.31

5"

L岳阳

19回

A5555

0.3

ii8

0

.岳25

0..6

15

0.6

25

0

.62

5

6.U

0

.63

0.

63

0

.63

0

.63

2..1

!0

Z.9

0

15

3

a，。且

4.5

4

。.26

0.3

8

03

8

0.3

8

0.3

8

3 、 ， ， 、 ， 、 磊 、 ， 电 ，

。.261

0.3

75

0

.37

5

03

75

0

.37

5

而 回 阅 ∞ ω

a a a n 队 生

0.7

57

1

.01

3

1.0

75

1

.12

5

1.1

75

m m 翩 翩 且

z 3 ， ‘2 ， 、 ， ， 。 ， 。

Q..!

.96

0.6

38

4日ω

0.7

50

0

.80

0

2 J A A 且 4

0.2

61

D

.500

0

.50

0

0.5

00

0

.50

0

2.2

85]

2.7

S<J8

3

.3n

9

3...

86日8

"-3

656

。。由6

D.1

000

0.1

00

0

0.10佣

0.10倒

n.s

8 8 8 8

2.3

75

2

.87

5

3.50日

A翻阅

4.S.

00

h 血 挝、 ‘ ， 4 3 2 3 J a q

GE

tffR

A!.

NO

TE:

Tri臼

Edbn

eflsio附

a:;;r四

wi'l

hth

os-t!

de叫

o;>e

db

y th

e 11

..an

u:fa馆打ersS国

dard国

tion

So

cie

ty o

f m

e V

alve

an

d F

ittin

gs l

nd1皿

tr)•.而

r~ad

le11g出

.sa

re :s

pe

cifie

d to加

ee

de

dm

al p

lac臼［or

ro11

veni

e11c

.e.

悦。TC:

(1)

Arne

rita刀

I .N

atic

mal

S岛时

ard

Tape

r阴阳而阻

dPill茸

Ga,g堕

(see

S区目on

7).

ASM~ 111.20.'MOl'J

(sec sccllonη. Since the busk lc,ngU1 and size (1bblc 5, columII 5) of the external th陀.1d huvc been rcdLJ.ccd slgnlfic:mtly fr1)m standard NPT, the stnrl end 。f the product lhr刷d will always I i皑 in吕idt! the face nf由e gnge. The maximur刮目110~咽bl~ vnrhllian in the e)<l町naJ Lhr阳dis n<> turns large Rnd one lLJm small from G让11 modi­fied basic.

EXAMl'l.I!: f'or il ＼分14 N阿R l!J<lurnnl Uucnd, ’Jnbk .5, column 7: lh1,1 ~lllfl 1m~l of the rnodlfi~'<I bMic thrend lies !hr(~ thris•~ls 11iiiidc thi: focc uf thu m耳c. TI111 toll!l'nncl! durlni.; gn吕ingwill l飞’ Z ii1ms huge to 3 1甘rn~ ln·rge. For 11 I• 14 NPTR lnli:rnal lhl't:!ai.I, ’f'nbll! S, c.ulurn11 18: th" ~lnrl 1•ml of !ho modified basic lhrcnd lies four thnmclli inuidc the la目。f tho fllllng. Thl' lt』l‘ir目『lf't? durln吗吕目吕In吕 wlll b已

h、r吕U to.S turm1 l臼rg‘峰’

6 SPECIFICATIONS FOR STRAIGHT PIPE THREADS FOR MECHANICAL JOINTS: NPSM, NPSL

6.1 Straight Pipe Threa~s for Mechonlcnl Joints

111 ;1ddltitm to presi:uri_ ... tight pipe joints, for which tnpcr i;:xlcrnnl tlircadii nnd tnpcr or straight intern口llhrcnds cnn b(• wsl.!d, there fire mcchnnicnl jolnt:i wh~rc

stJ·n iuht pipe lhread1:1 arc used，丁h日ir pitch dinn、cl:orsnnd root nnd crci.l tnmcalions V(lry as described bdow. 'These types of joints Ort' OS roltow11:

(11) frce-fill inu mcch自11ict1l joinlt> for fixturci;, ’fnblc 6, holh cxtcmfl l nnd intcmti l1 NPSM

(b) loo阳“fl I Hug tttcchanknl lolt,111 with lock·n U t11, ’Tnbll! 7, buth cxh.:rnnl 1111d h'tcr11t1l, NPSL

6.1.1 Thread Designations. ’ rhcsc thrcnd吕 ar12 dcsig· 『i:Hctl in nccord白nc日 with pura. 1.3.J fl!! followH:

加27 NP例

如27 NPSL

6.1,2 Pitch end Flank Angle. Till• pitch and flnnk nngle ilff.? the s~me r1s the corresponding dim1msion5 nf the taper pipe tlm•11d descdli日d in Sl'clion 3.

6.1,3 Diameter of Thread, The bfl::iic: pitch diameter for bolh lhe externnJ and inlemRl lhreads ls equal to£, of ThblL> 2, which i.s Hu.• si'lme ns the In咆F end of lhe internal N'rT thread.

ιz Free-Fitting Mechanical Joints for Fi且tures, NPSM

Pipe is oflen used for llpecfol applic1:1tio!i5 where there are no interna l pre臼町田 nnd, cons吨uently; no se11ling req u ir-emen恼， Also, slrnighl pipe 1hre11ds 目reBomeHmesfo四d more sLJiled 01· convfillienl where slraigM lhread jolnls nrc r呵t山ed for mc:ehonical assC'mblies. ln U1ese cas囚， NPSM threads can be us时， creating n rcnsomibly close flt of mntlng pnrts. The dimensions of these thrcllds ;iw given in Tnblo 6. Caging is dcsc1·ibed In p白rt1. 6.4‘

C创到r•'Uh' /\GMIJ Into•’＇＂＇＂＇阳d阳酬曲；t by lllGlllID副 ll<wnM制lllMMS刷””•11!001叫l~n or ’”’w酬log p刷刷刷刷惘剑’<1!1N问mi’ I~

16

6.3 Loose--Flttlng Mechanical Joints With Loe阳U悟，NPSL

Tho American National Stanclurd Extcmnl Lockmit Thrl!ad is designed to produce ii pipe thrcnd having the lilrgcsl d i白meter thnt is p<'.l脑i.ble to cut on $tnndard pipo. Ordinrtril沪剧rRighl lnternr1I throods nrll ueed wit.h th郎眩目trnight extcm1d lhreHcl~. pl'Ovid in.s n ln(>se fit. The di mens.ions of lhese th rends arc givrn in 币＼ble7. !twill be nutei;l that lhe mnxlmum major dinm~ler of the cxlerm1l thread ls slightly greater thnn the nominal outside dJnm­otcr or 出e pipe. The normnl mrmufoclurcr's vorlotlon in pip13 dfomctcr provicl凶 for thl11 lncrc;1sc. On~ nppHco­~Jun of a taper pipe thwad in cumbinntion with i'I locknut threncl that h口白 been in \lse for some time is thal ，吻。wnin Tnbh.' 7. ll consists of llw nipple thrended joinl usli!d to connect slrmdplpcs with lhc floor o.r wnll of n wntcr st1pply tnnk.

6,4 Gaging for NPSM and NPSL Threads

GAging to properly conl rol the produclion of t·hese stroight threads should b口 through lhc USC or GO ond NOT GO gages or lndientlng lypc gogos.

6.4.1 GO Gaging. 'J1w CO size is l'lttcptnble when lht.> GO lh陀目d gn~己（pl ug or ring) frc:t•ly l'ngogc:i lh1;? full lhrcndcd length of the prodt咐，

6.4.2 NOT GO Goglng. '111l' NOT GO slzu i苗。cccpt·nblc: whc‘ 11 tlw NOT CO lhrcnll gugc (plug or rl ng) nppllcd tu the procluc:t r·hrcntl docs 1101 cntl)r mote thnn three c:umpldc l11rn11. ’The 将ngc t,;hould 11υt be forced. Special comlltion日， !:luch m1 ~xccptionolly lhln or ductile mnh>rin l，日ma ll numbur of t·hrcnds, etc., mny nccci>si!'att: mt1dification tif t hi~ procl ic~.

6.11.3 Indicating Gages. When ut1i t1g 1ncllc:i ll口8gugci; for 吕tmight tltr1!11ds1 rdur to 八SMG Bl.2 for ui;c.

6.4.冉 Gage Dimensions. Gases used for NPSM shnli be l'l'\aclc to the pitch diameter llmH·s specified in 币1blc6.Giiges used for NPSL Shilll be rm1cll! l.o l'lic pitch diameter limit再 i;per:ifled In Table 7. Th日自e gilges shf1ll bti inadc in Accordance with stnnd11rd pnictice for 吕tra ight thrt!ild gnges mi outlined in ASMJ3 Bl.2. The minimum mfljOr dinmcler of the CO thread plug g11gc nr inte1·riol fLmc­lion1'l indlca ling gnge shnll be 叫ua l to ~he minimum pHeh dinrnclcr of the lntcni11I 1hre11cl plul! an 11mount cqu;1 J to 0.64951905P. The ninxlmum major dlmnclcr l}f th~ NOT CO thn:<1J plu吕 IP吕但盛h;1Ll bu c4.\Jitl lo ~he maximum pitc:h clintnl!tet uf the hllcm且l th民•fid rlus an amount equ日l to 0,4330·1 270P. 啊，~ mnxirnum mlnor d.i;:imeter of the GO thn~ad ring g;ig"' or ex阳.mii l furn:­tionol diHmeter indkaling 1;11ge shall be e91.rnl to t·h!! mf!ximum pitch di1H11~ter of the ex lerrwl t'hl'ead minu!i an flmoLJnt 叫uni to 0.4330J 300f~ The minimum minol' dinmetcr of the NOT GO lhrctld ring gngc sh nil be cguA 1 lo the mlnhm1m pitch dlm:nctcr of the exlemnl thl'cad mJmrn nn nmount cqunl lo Q.2.1650635旦

ASME 81.20.1·2013

Dime ns ions of External and Inte rnal Straight Pipe Threads for Fixtures, NPS M (Free-Fitting Mechanical Joints)

Table 6

凡，• 0.12500P ]

H” 。，自由6026F'

4蜀， 0.10B25P

Ila• 0.64952P

」－ f6,• 0.10825P

4，严 o.2ias1p

11001

广－」－μ－｜－｜－－「

Cro吕t

lnternol Thread

lntcronl Thr·咽。d , Cl~ss w Minor Plomctcr Pilch Dlpmotor

Min. Mnx. Mln.1 Mox.

Extcrnnl Tl 『aud, Cl目NS 2A

Mnjor PltHTI唱tor PilCh OJ(lmo1or

Mu啊， Ml白， Mux. Mitt.

Exton币。l l'hrond

0.0. or Pipe,

D TJirootls/

Inch No1nh1a1

Plpo Size Allownnco

" l7

0.3783 0.119711 0.6329 Q.78~1

0.99S8

ll

。‘37)6o.~916

0.6270 Q.77811 0.9889

10

Q.364 o.~s1

0.612 日.75!1

0.970

9

0.358 0.1168 0.603 0.747 0.9S8

o.3f>日90.1!8~9

0.6211 0.7718 o.9820

8 7

0.3725 O.ll90:l 0.6256 0.7'16!1 (J.98/3

6

。，390

Mli' 0,653 0.813 1.024

s UM叶Uh叫Nmunu川

o.J!17 o.526 0,662 0,823 1.0)111

0.001 J 0.001) 0.001 ,, 0.0015 0.0016

3

唱，“oa－－h”’

aq

吨，.. E .. , .. Ea

唱’

2

o.~os

0.岛110

o.Gn Q.8110 1.oso

l.2"62 1.5!112 1.8302 '2.30411 2.7720

1.:Z386 l.S8Jt1 1.8223 2.2!16) 2.7622

1.211 l .S55 l .?911 7..lG日2.727

J.i()l l .Sli品1.785 2.2S!I 2.708

1.:m1 1.5756 t.IJl ~4 2.2882 2.7526

1.236!1 1.5816 1,HiOS 2.2944 2.7600

1.21$1 1.626 1 .865 2'.339 Z.826

1.w:l t .638 l.877 2.:m 2.8t1)

0.0017 0.0018 0,0011! 0.0019 0.0022

l l .5 11.S 11.s 11.5

8

1.31 s 1.660 l.!>OO 2.37S ;2.875

νMUηUUM

－－

aA1

．，‘『’’

3.3984 3.89$1;! 4.3971 s.4S98 6.5165

3,3且8~

3.88813 li.3871 5,4493 6.5060

3,353 3.8118 4.346 5.4日日G.4<i~

3.n4 ).83& 4.333 5.J？~

6.452

3.3766 3.8788 4.3771 ~.43!10

6.ll9S5

J .J867. 3.8665 IJ,3848 !l.41J69 6.5036

J:.li!i 2 J..9S3 4.4Sl S..513 6.570

J .467 3.968 11./166 5.5.28 6.585

0.0023 0.0023 o.oo:n 0.002~

0.0024

。。“白”。nohH”

J.SOO li.000 4.SOO ~.563

6.625

UHM Zd『dzt“

F3，。

GENEllAL NOTES: (a) NPSM thruads hav1.1 il. form slm1lilr to Lhnt ot UN thrunds 1i11d 1olorn11ccs Sfmllm lo 2A/2B. The lnlcmnl !11rend hns A mfnlmum 1}1tch

diameter ..:quol to E1 of NPT !hread5, (b} rho minor diameters of e且lemal threads nnd mnJor diameters ol inll!rnal ihreads nrc ihos11 as produced by c:omtml『cl日I strnlsht pipe

dlo& Md comm画rel画I sround stmlght pip!.' tapιThe m~Jor dl~meler or lhe 以ternl!I !h1四d ha5 been c~lculated on Lhe basis or ii [fUncil• tlon 口f0.108251', and the minor dlamcil'.!r of the lntornal lhrond ha:. boon Cii lcul~lud on lho ba击Is or Ii I阳r1cotior1 of 0.2l6S1P, lo pro· vlde no lnlerr.岳「ence rtt cre$l 到nd rool wheo produc1 Is gnged‘

N"OT£: ('J) Column U Is the same as the pitch dlilrncter il l Iha Ii!鸣E and or lhlornal throild, E1, Basic (sec Tnbll! 2, ~olumn 8).

17

C叫.，，，旬t-1,.!;Mttntom割llnn"µ,.,. i•d by )II~ uiv!Df ”r.•n•”制”，Ani.U!”。阳’M剧也陆的伽＂＇＇＂＂＇＇＇吨，翩翩......”恤. ..., .... ; ....”18

ASME Bl.20.MOH

Dimensions, Externa l a nd Internal Straight Pipe Thread for Locknut Connections, NPSL (Loose·Fltt l11g Mecha nica l Joi刑事）

Table 1

Taper pip四lhread

Strui日li t l0Cki'H1l thromJ

Stonclard lllllng _ , with tnpor thre11d

Locknut

Tu『ik fl口。ror woll

Pilch Olnr『rn t nr

Min. Mnx.

6 9

0.)1!98 0.5125 0.6496 O.ll07S 1.0W>

Internal Thrc11ds m

m

wmM·

hmh

m7

hM

MM

MmHM Ellte rnal 1'hre11ds

Moxl111um1 Mojor

。lnmolet

0 .0. tj f Pipe, υ

””tnl11al Pipe Size

Pitch Olomoter

Mox. Min. Ttuaods/

Inch

Q.)66) O.!l073 0.611 1111 0.8008 1.0112

6

0.)6~ 0.11~0 0.607 0.753 0.9611

0.380~ OJ1986 0,6)57 0.1696 l.0000

0.36110 O.S038 0.6/109 0.7963 1.0067

4

O.ll09 0.!)111 0.678 O.Bt;/1 1.054

3

帽’

hOOO仇”Aq

B

，“‘．，＆‘＆

鸣，af

2

0.110~ o.~tiO 0.675 0.81&0 1.050

l

忖阳川UA以munUH

川l.2739 l.61S7 1.8576 2.33 l ~ 2.8129

1.26SB l.GlOC. 1.8495 2.32Jfi 2.8012

1.208 1 .~ 53

l.792 2.265 2.718

1.2 s 2'3 l.S970 LB360 2.)099 2.7817

, .l604 1..6051 Ull~ lll

2.J lBO :l,79)4

1.318 1.66'.l l ,902 2.376 M77

11.!> 1 J.5 11.5 11.S 6

1.315 L660 1.900 2.315 'VJ7~

1%un2% -B·E·

”’’

3.11393 J .9)!16 l1.l;:l79 5.5001 6.SS67

3Jo2i'6 3.9;>79 4.4262 5.48811 6.S4SO

3 .)L;l;

3.845 to.;1113 5.1;05 6.462

)/IQS1 3.90811 4‘4067 5.4688 6.S2~5

J .'1 198 ~.9201

4.416~

~.4805

6.S)72

3.503 11.00~

4,502 5.561; 6辛620

臼RVAMMnmvnmuon－v

3.500 /; ,000 4.500 5.563 fl.6？~

3

一切456

筒唱d

8.S50B 10,6717 12.6686

8.5'.391 10.6600 12.6%9

8.456 10.577 12.S74

Ml96 i0.6~05 >2.6)74

l!.53U 10.6522 1i.61;91

8.615 10.735 12.n<

8 il a

8.62S 10.i'SO 1:uso

。”VAHUτJ·

4’a····羁

NO哇：[l) A5 !he Ame1lcon Nallanal Standard Stral&hl Pipe Th『eod form or t.hrcild Is produced by ii slnslc iool, !he m创or nnd minor t:llnmi;ter~ o『

th.: lntomnl thrcod arid tho mlriCir dlemctcr or !Me external thrnad a『I! pres1』111ed to v<iry with th!! pitch dlilmeier. Th~ mil)or dla『nmur of lh!! E且tcrm1l lhrend Is uslrnlly dotlltmlnod by tho d阳阳。(C『 口I tho plpo. Thus自 lhoorollcnt d!Om自1er5 result rrom 目ddlng the deplh or lhe 11unc11ted Um:ad (0.666025月 to the maximum pHch diameters Inι。lumn 弘 a11d It should be und缸『ttoocl lllnl commorcl;il µltJC wlll nol alwuy~ hnvc lho&o mnximum mMor diameter~. Thu locknut thread Is 何lab llshoci o" tho ba~ls or retaining tlie grea1es1 posslble amount of meli!I thick『l!!S5 between th!! bottom of lhc th『end nnd iM Inside of lhc pfpo. In order lh<Jt 11 locknut mny m loo~uly on tho l!l'.ler­nnlly thrc~dcd port, an allowance equal lo lhe 1ncrease In plleh diameter per tur同 Is provided, with a lole『anco or 1.S 1urn& ro『 bolhE且tcrnal and Internal th「fiildS.

18

Cupy1lg,../.!I盹 lhlnrml阳叫，，，刷刷刷的”18 unJ’” 时阳”畸叫刷刷MU”。帽归＂＂＇剧剧。，抽阳°＇＂＇~ pOIMililld wli阳d阳嗣嗣阳咐’118

ASME Bl.20.1-2013

1 GAGES AND GAGE TOLERANCES FOR AMERICAN NATIONAL STANDARD TAPER PIPE THREADS, NPT

7 .1 Gage Design

Gngcs should be mndc of hardened steel nnd conform to the dcslgl:'IS recommended ln /\SME B47.l (see Jligs. 7 and 8).

7.1.1 Gages for External Threads. The t 1 ring gage r1nd i.fttB~ali.ng 伊gi:: ！；！（哇ml:nbl haw t1 l四8队已qunl to dimen!ik1n L1.

7 .1.2 Gages for Internal Threads. 'fhl.'. L1 plug i.rncl .indic1;1ting ga15巳 LJlem巳rtl!l ha.v¢ a longth equ自1 to d iniOli· 11ion L.~. 1hi /,1 ph•g gage has 日 gar;ini; notch locPted 11 di11lnnce /.1 from the smnll cml. ln loCflting the bMic gaging notch, the plnnc of the nul'rh should lnl日rscdlhc crest of the gngc thrL"nd. 11ic nolchi:d nren of lho lnrge end of tJ1e plug gng~ 昌hnll i'emuln i;hi.up; howcvci; il i;hould not hnve burn; extending out~id~ the thrend form.

7 .1.) Partial End Th『ends. Pnrtil!ll 日nd thrend:; shall be removl'<l on bolh 1Jncls of the ring 阴阳 nnd both ends of tho plug gngo. 'I his shnll bt• done by cham(Ning lt\ Lhe mll,or ditm1ctcr of plugs aml ml1jor diometerυftb飞gsor 吨。nvolttUυn” to rull· form pro(ilc. This nvoids pυssl· bit· sen I Ing error from bent 01· mnlJOl'med fea thered edge and protects lhc thread from 'thlpph,g.

7.1.4 Marking of Gages. Ench gogc shnlJ be mArkcd sons lo jncllt:utc clcnrly U\L' nomlnal size of pipe, Lhrcacls per inch, and lhu propur tJ1rrnd series J aslgnation os given in tlw rcspL'ctlvc 1Jcctlon of lhiii Slnndard. For rhi吕曲， t he mnrklng i;hall be on lhc fncc of the lnrgc end.

7 .2 Moster Gages

Mnslc1· gages tuc used lo lnspcct working g鸣曲 nlthi: limes of rn11nt1fodurc nnd colibrntion. They oro •tlso used tn lll.!lllng ltidlcotlng 吕ngcs. Adclll iormlly, mo1:1tl;!f rings inspect mtu;t~r plui;t;, and n"li'lt> tt:1r p.lugs in叩ect

rnni;t~r rings. ’fhe L.1 plug nnd ring rnmiter gngea 踊rerm1dc to the bmiiC clim1msiom1 specified in Table 8. '!hi lhreod roots of these gn~es shall clear fl 0.0381/1 flat or mny be undercut beyond 目 sharp k 丁11e cr·csts a陀lnmcnted by O.lOOH

7.2.1 M矗ster G矗ge Tolerances. Mnster gTig白日holcild

be mnde lo the basic dimensions 11s arr＼』mlely M possi· blc, but in no cnsc shnU the CLHtrnln·tive variation exceed onc-hnlf of the total cumulatlvl' tolerance specified In columns 13 aitcl 14 of Thblc 9. A master ring nnd m:istcr plug nrc mnt时， the li:'ltge end of lhe rlng seating Aush •1t thi:! plug notdi withi内 土0.002 in. Fnr sizes Yi6 through 2, within 土0.003 in. for si立即 2~ lhr<;>ugh 12, and within 事。.005 in. for ~i~c:i 14 日nd larg日r. A 吕~！pplernentary check by optk11l or 0U1巳r merms ::ihci1-1ld be m11de of fi;ink 11ngle

Cu附~hi峭Ml lhibmul锦州时F，。 Ir恤， b>11'18 t捕归，曲曲”.. ..,111ASMD ”。时’..1ur.lloo剖Hniw酬问IJOl"111刷刷＇＂＂＂旧的··阳mII惜

19

Md form. Each tnastor gage should be neeompnniud by t\ rl!c(}rd of lhe meni;ururrwntli t)f nJI idem四t吕 of the thrend 自11d the st创1doff uf m邸tl!t plug or mn且ter ring (huge end of ring gi'\ge to b目5ic notch tif plug gag1斗，

CAUTION: It should b~ undi;f!itood llrnt only 且 spi!clfle:illy

ITli!khcd ~t:t of m削II:崎（I.., ph•s itnd /..i ri11gl 归自 bl' 1:xpcch;:d la mali! with l!nch ollwr wllhln lhi! luhmmcc spccHicd nbovl! nnd in Gcner~ I Note 衍） ur下由1母 9. There :ire m.1hy cl111rnelcrir1tlCB nr vMlntlons In gage cl11JDc1118 that moy combine tu 1r.iusc 11 signHi· c:ml 刷刷tloffdlffl!renee b剖Wi.!i!Il m阳ll!.l'gng副 th:il aro 1101 spi!clr­itnlly milkhcd.

7 .3 Working Gag;田

Working gngcs Ori! used to in:;pcc:t p』·oduct ~hreads.

’liwy 11re mode to th日 l;m:;i.c dlrnem;icmi; given in Tnblc 8. The molfi nf nil gllg~ l'hrends shflll clear 0.0381P width. I\ shmv V or undercut denrnnce iB occep111b.le. Th倍。因U:ire to bll lrul\coted nn nmount t!qunl to O.HOf (or 27 l.hl'cncls per Inch (lpl), 0.109P for 18 lpl, ru'lel 0.1001' for 14-tpl, 'l l培植tpi, nnd 8-tpi threads （国t?Q l'lg. 8). 1t is to be noled 1'11ot lh时e Bt1ses iire tn,mcnted 白l the crt!!ll llCl lhot they be11r o.nly on lh日 (Jnnks of lhc thr℃nd . Thus, they do not <'heck the p1叫ucl crest· m· mol truncntion11. Wht'n ii ls deemed nc:cci:snry to J elcrminr whether or not int<'h truncations n1·e within the llm!Ls spccHicd1 or pnrtlcu· lnrly thnt the n’讪ximuni lru内CLltlm' s 11 re no~ oxcocJ od, 。1、 l lcill p叫出tlon Is o川 common rnctht)d.

7.3.l Working G自go Tolcronces. Working gogcs iihoul.d be 1nndc l() the b阳le dime刚loru, spccifiL'd In 'Tbblc 8 nnd within tu lernnce臼“pccifi£?cl in Table 9. The mnximum wc11r on 11 working pl u吕拓nglol flhn ll not be 1nori.• Lhan lhc 1-!quivnlto!nl of Y.1 turn smnll from hn!:iiC::, when chcckrd with 日 muster gnge. 'fhc maxi111l 1~1 wenr on o working ring gnge shall nol be more U111n 地 turnlarge from bnslc, whl'n checked with n mnstcr gnge. /\ st1pplllmentni·y check by optlcol or other menns sholild be rnndc of rtnnk nnglc ilnd form.

7.4 Relation of Lead and Angle Variations to Pitch Diameter Tolerances of Gages

When ii Is ncccss1uy lo compYlc from mcnsur’已mcnlsthe cteclmnl pnrl of a turn 山nL n gage vtuics from lhc bnsk diml!ni;iana, Tc1bll!!i 10 t111d l1 11hould bu usc:d. Table 10 gh'llil 白白 correction in cUaml!ter for angle varill· tia11,.;, and tnble 11 gives the c(lrrection in di(lmeter for lead varintion5. These corrections 日re fl lw司ys 司dded to the pilch diam日ler in the cnsc nf extermil thref!dll nnd subtrncted in the case of inlemnl thr回白， regardless of whetheJ' the lead or :mglc variations arc either plus or mlnus. ’rho dinmcler cquivoJcnt for k od oncl :mglc varia­tions plus the pitch dimncrer vnrln!lon nmltlplicd by 16 i;ivci; the lnngiiudinnl Vllritition frorn bnsic ilt the gnging notch. This longitt1dlnnl vnrintion divided by the !}itch i:qui!IS the dt!dmnl part of n turn tlrn t thl.! gngc va』妃sfrom b;i:;ic nt the gaging n~tcli.

ASME ll1 .20.M013

Fig. 7 NPT Standard Taper Pipe Thread Plug and Ring Gages

1’ 1110 '10(lfl e

Notch

Top臼， or lh『llnd

1in16 m白白BU『ad

。内 dlam111ur

1LU

L,, Ring gage

20

C啊’V”1hl11t;Mr 1H1”””lio•’”di'mvkJqd hy lji~ ＂＂＇旬， M'"n••Wllh刚刚，阳’•pH.Jucl＂”。， n;iw.1恤叫阴阳恤owlU,."l耻－ ~u'l1 1110

ASME. P1.:!0.1·2013

Flg. 8 51』目ested Form of Gnge Thread

C『osts truncated

GEN~llAL NO'tE, !loots musl clea1 0.0381 P wldll1.

Co川崎恻M阳. h曲，削恤，耐F陆...’”i 111 ”’画”’川时趾翩翩witllAP.MflNO,.jl/OOi后＇＂＇＂ or OOIWO!kOID jlllllfllllod ... 川崎川h阳蛐勒刷n 1119

21

问001!1 ”harp 01 u11clc;w:u1 (form optlonnl)

.,

.. A

l;i’;

Basi

c. D

ime

ns

ion

s o

f m陀adedGag四

for

Am

eri

ca

n N

ati

on

al Sta

nd.a『d

Tap

er

Pi i

:-e Th『eads

,N

PT

胃1icl'o'随揭口

f

lt Ring也r

Gag

e 曰emen.恒

l回（fe田

e11

1 B恼，(T

hrea

:iB

队.Of

.25/n

“i11o

r Diame担侣。f

R'lr:

ig

and臼tema

ll'n

dica

iting

G

ages

At Sma四

AtG

agjr

tg

E时，鸟”。

tch,

E1

刊ill

rtcf!•

问.a11曹

Pit

ch Diagiete路口E问吨，

R.iD思

and

tmfiαting G

ages

t剖ote（明

At

Sm

all

At 6

agi1

1g

Ai la唁E

函cl.

Eo

No

tm. E

r毡，d

」乌

Pla

ne

Pla

ne

Pla

ne

Maj

or D

iam

elel

s. o

f Pf

L愿a11d

Inte

rnal

lndf

c.a监ngGag自

At S

mal

l A

t Gag

ing

At l

a号理

由1d，马

N.o幽

．民

En:

d,£1

问ane

网a:

ne问a目E

剧。mi

rual

Pip

e·

Siz

e

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ASME 81.20.MOtl

Table 10 Diameter Equlva恒nl of Va rlaUon In Half Included Angle of Threa d for Too恒 and Ga ges

Variation 1 In Half Angle (In Ml11utos) 8 Thro白白／Inch 'U.S Thrc~ds/111ch 14 Th『·onds/inth 18 nm111as/lncl1 27 Th『cads/inch

1 2 3 lt .'l (,

- ·一 - 一。，000055~ 。.0000389 。，0日00)20 口，日0002l19 0.0000166

2 0.0001119 0.0000778 0.0000639 0.0000~97 0.00003'.)1 3 0,0001678 。.0001 1 67 0.0000959 。.00007ii6 。‘0000(i91自 0.00022'.37 0.00015 )6 0.0001278 0.00009911 0.000066,

。.0002796 0.00019'/j 5 。，00015!)8 0.0001243 。.00口0829

6 0,0003J56 0.000733布 o.oo口1 917 0.0001 ~91 0.000099~ 7 0.0003915 0.0002723 0.0002237 0.0001740 0.0001160

。.O()OJi/1 711 。.000311 ? 0.00口2557 0.0001989 0.0001326 9 O.OOOS03'.l 0.0003502 。，0002876 0.0002237 0.0001491

10 o.oOO!>S!il3 0.00031i91 0.000Jl96 0.00021186 0.0001657

11 o.ooo61!ii o.ooouso 口，00035 15 o.oooin11 Q.0003623 12 0.0006711 0.000/4669 0.000383S 0.0002983 0.0001989 1'.J 0.0()07:171 0.0005058 0.000~1 55 。.ooon:n 0.0002151, 111 0.0007830 0.000511117 0.000114711 0.00031180 o.ooo:ino I 5 O.OOOllJ8!1 0.00058.36 0.00011791, o.ooo:m?!I 0.0002ii86

1 币 0.0008948 0.000622号 0.000511'3 。，0003977 0.000;)65) ti' 0.0009508 0.00066111 0.0009113) O.OOOU26 0.00028l7 18 0.001()067 0.0007()03 0.0005751 。.0004~7(1 0.0002983 19 0.0010626 0.0007'392 0.0006072 o.00011nJ 0.000)1119 20 0.0011186 0.000//81 0.0006'.ln 0.000691'1 0.000331/i

21 0.001 J74~ 0.00081 70 0.0006711 o.ooo~no 0.0003480 22 。.OOl 1:104 0.0006559 。，0007031 0.000~11(,9 o.ooo:i646 2'.l 。.0012863 0.0008949 。.00013,1 0.0005117 0.0003811 i11 o.oon1， ~;i 0.0009;J38 0.0007670 0.0005966 0.0003977 」5 0.00139R2 0.0009727 。.0007990 O.OOOC.:1111 0.000111/i)

26 。.001/15的 0.00103 16 。，000!1)0!1 0.0(!06~63 ().000'1309 n 0.0015l01 0.001050:; 0.000136i 9 0.00067ll 0.000/14 7 li 28 O.OOl 5660 O.OOlOS?ll 口，00089li9 0.0006960 o.oo011c;t10 ~9 0.00l62l 9 0.00112'83 。‘0009268 0.0007109 O.OOOli806 JO 0.00l 6779 0.0011岳n 0.0009SSll 0.00071157 口，00011971

/j ~ 。.002 S169 。.0011~09 0.001ll)il2 0.0011 186 0.00071157 ~o 。.0027966 0.00l.911 511 0.00159日。 0.0口12/i29 0.0008286

GENERAL NOTES' 。） Values olve11 111 Inches ~ I 68哝(bl In solving for the diameter equivalent of angle W『lalJons, lhe ave『anc varlallon In half Included angle ro『 tho two sld白。f lho thruntl,

res司『tllrn1 of lhcir sign~， should be tnk<m. le) Tobie Is b11~0C! uDO!• 0n NPT gnge wll '1 O.lOOP root/ creDI tmnc~ l!o目昌 with aqu11I n11!f·angl1;> varlotlon5. J'o『 gt.her llllfll!~ will、 equal

iruncatlons, 1白UlllplY by 0.86('>00/.! - :l (t『uncatl口n)

。‘GGGGG667PNOT!< (l) Din meter cqulvnlcnt .. i.53a1l9'illfl tan 品h wh!!rc &r = 1111rla1lon In hall Included angle of lhrnad E且p『esscd In mln l』＼cs.

25

ι4””1惜111 Alli.ll i刚刚’••l<ioj.I问翩翩lov Ill~ 1111'1”’阳的．．酬1，础M「”。＇＂＂＂＂＂＇＂＇＂创睛’W刷刷咱j)irnillillWI”.Oi届时嗣阳1’”’1 ii1B

口 。 ”u 】 飞 『e z 〉 叨 ’h m Z E E ω－ 5 3 ω －

可 『 。 主 怠。 。 σ 艺 工 ω c 3 a雪 2 0 。 2 E 亘 古 、 ，ω z m

Z O Z U『 a z o － －2 0 二 ＠ － Z E A E E 言 。 a E E C － E Z E E 3 王 ω

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02

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0

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31

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03

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35

0

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46

7

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61

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2

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28

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4

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85

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03

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0

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35

50

6

0.0

02

66

73

0

.00

28

40

5

0.0

03

01

37

0

.00

31

86

9

0.0

03

36

01

0

.00

35

33

3

0.0

02

65

00

0

.00

28

23

2

0.0

02

99

64

0

.00

31

69

6

0.0

03

34

28

0

.00

35

16

0

0.0

02

63

26

0

.00

28

05

8

0.0

02

97

90

0

.00

31

52

2

0.0

03

32

54

0.0

03

49

86

0.0

02

61

53

0

.00

27

88

5

0.0

02

96

17

0

.00

31

34

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0.0

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30

81

0

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34

81

3

0.0

02

59

80

0

.00

27

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94

44

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00

GEN

ERAL

NO

TES:

(a

) V

alue

s gi

ven

in i

nche

s at

68°

F.

(b)

Dia

met

er e

quiv

alen

t =

1.73205081识

where伊＝

vari

atio

n in

lea

d be

twee

n an

y tw

o th

read

s.

ASME 81.20.1-201)

NONMANDATORY APPENDIX A THE TURNS OF ENGAGEMENT METHOD OF GAGING

PRODUCT THREADS

A-1 METHOD OF GAGING

The t·urns of en启<isem1mt methocl nf g白glng t11pi!r lhn•nd!! delermineii U1日f lhen• is 11n adequate numbor of ihl'Cflds nvnilnble nl hnnd cn~agement . 'f'his method eliminates the effects of product chnmfors dln·ing gaging. However, ell ffcrctt ecs between gages' end th re~cl Mnovnl i1nd gagil c;filRI truncations may give diHercnl g<1ging r制ults for lhl? l'ia rne pruduct thr(!nd. This may ncce11sitale coll11bornllon belw~en Huppllcr 110cl user.

<:-O~y•lgl" N!Ml ＇＂＇＇，，刷咽n时~ •• ，.协~~y ”吨＂＂＇俑， ＂＇＂＂＂＇•制tnMMC”“’”n由刷刷....，阳’.....咱阳川，，，，时’制”啕•JI ln1n刷阳捕’ ll lfl

27

A·'2. TOLERANCE

节飞Q thcorctlcnl basic turns q{ cmgagcmcnt are rmmcl in Ctlll1mn 7 of Table 2. For the t-urni; of engagement method, the tums to remove the L.1 gn萨from the product threncl are cmmtecl nnd mu5l be within l'hi'! tolurnnce of bm1ic number of I-urns， 士1 turn.

.· .,

ASME llJ.:10.1-2013

NONMANDATORV APPENDIX B TAP DRILL SIZES

l•Joles p附pmecl for lappinf; Cilll be eilhnr strnight or tnpercd. llolh nre 口cccph1blc us long as the product st11n­dnrds for th1c,1d ~~lmcnslons ore met nfter 1·nppins. l'hc minor d lnmclcr of lhc produd lhrc.1ds should be cut by tho tup minor dlnn'lctcr to 1msureo conccnt时elty wHh the pllch clinm口l但r, n6 well n掉 lo 吕口n巳rnlc th巳 prop巳I' lhrc‘1 h白ighl ii 『11丁l In』n「ntions. ’门1!! ac:Lu口l hnlc 11izc prior to tnppinG is dcpenc:lent on nrnny vnriables 日nd 11hould npr11'011imJ te the dlumctcr K0, column 21J of'lnhlc2 (Un8k MlnOI' Olomch:r at SninJJ Entl of Pipe). Hoh: siχes mny vnry from Ko su the tnp cnn cul •111 ncccplnble !Jlpc lh1't•nd with the wq11ircd lhrt•ad height.

Co曲吨’＇ ~IML 恻M阳1偷偷刻，阳’鞠oMd I>\' ”幅“飞Jot•臼崎ow;11tolMf陆...，.，...，嚼，... .. Nil帽”...伽阳”。”刷刷曾协”．，倒... 价。”’””

28

ASME 111.20.1•2013

NONMANDATORY APPENDIX C THREAD lYPES AND CORRESPONDING GAGES AND GAGING

Sec Tt1ble C-1.

Table C-1 Th『ead Types and Corre叩onding Gages and Gag ing

Producl ihrm1d 1oleronw Applied to Bask Slro

fhreatl lo TYPO or Thr岳lid Exlem~I Internal

Bil Gll(llid ThrMd lnlcmiil Eillcrnol Gaged With smnll L自rge Ll!『ge Small

NPI pressure T~pe『 rnpe1 L1 口1 Indicating, gages l Turn l Turn 1 TU「n j TUrii

NPSC Pro Mure Sltnl11ht L1 白I lfltllc"lln且 a~gr，吨 l比 Turns 11/7 Turn

Nl'TR M~ch~nlcel Tape『 T~per Li 日r lndlcnllnr. 11n1JU~ i Turn 0 Turn~ 1 阳rn 。 i ll fll飞

(Note (l)) (Note （丁）1 INote (i)] (Noll! (2)1

NPSM Muchmilcal Straight Slrol11hl GO/NOT GO 01 In巾

Nf'Sl M曾ch”’1lcol Strnlghl Strnl11ll1 CiO/NOl GO or lndlttillll!l f.lil自仙

NOTF.S: (l) Sol! TJblo S, colum内 Y for 1h11 n1ocllflod eλ1ornol 1hrot1cl bflslc position. (2) s白t> fobk S, cohlmn 18 Int the! i，。”1nnl 1 h1州d ba自le llOllilff)ll bolow lhC! f1tCC Of tho Jlltlng.

29

Cu间，阳？现 A!)Mt h阳＇＂＂恤，耐”！UY山t句IHll ”’曲，， 11.. n矗•1Wllf\MMf”。，.，，，创刷刷n 01阳＇＂刮阳Dr蝠，，，llitOtlwllhliul i<ill帽恤，，， lllB

INTENTIONALLY LE阿 BLANK

30

Copyr;ghl ASME In ternal；。nat

Pm,;ded by IHS "nder t;cense w;th ASME No reprodoc l阳nor netwo仪rng permHled w;tho"t Ucense fr。m IHS

INTENTIONALLY LEFT BLANK

Copyr~ht ASME lnternaHonal Provided by IHS under license with ASME N。，eproductron or nelworklr内g permitted wrthout licen'e rrom IHS

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