≠ EDICT OF GOVERNMENT ±

JAPAN

In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them.

The citizens of a nation must honor the laws of the land.

Fukuzawa Yukichi

JIS B 0203 (1982) (English): Taper pipe threads

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UDC 621.882.082.2

-This -English version is for information purpose only. The original Japanese text of this Stallaard was revised in Ma r., 1 asa

~APANESE INDUSTRIAL STANDARD

Taper Pipe Threads

'-' IS B 0203 -1982

Translated and Published

by -'

Japanese Standards Association

Printed in Japan 68

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In the event of any doubt arising, the original Standard in Japanese is to be final authority

Errat. for Jis (English edition) are printed in Standardization Journal, published monthly by the Japanese Standards Association.

Errata will be provided upon request, please contact: Business Department, Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, JAPAN 107 TEL. 03-3583-8002 FAX. 03-3583-0462

Errata are also provided to subscribers of JIS (English edition) in Monthly Illformation.

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UDC 621.882.082.2

JAPANESE INDUSTRIAL STANDARD J I S

Taper Pipe Threads B 0203 .. ]982 (Reaffirmed: 1992)

1. Scope

This Japanese Indu8t~ial Standard specifies taper pipe threads(l) and is applicable to the threads(2) used mainly for pressure-tight joint~ on the threads for jointing pipes, pipe fittings. fluid machinery, etc.

The taper pipe threads of PT ~ and PT 7 to PT 12 in designation and the pa~allel internal pipe threads of FS ~ and PS 7 to PS 12 shall be as specified in Appendix. .

Notes (1) To be pronounced "kudayo'· in Japanese.

(2) These do not apply to the screw threads for oil-well pipes and other special products.

Remark.: The threads specified in the text of this standard accord with the pipe threads specified in ISO 7/1.

The pipe threads specified in Appendi~ are not comprehended in ISO 7/1.

2. Classification

The taper pipe threads are classified into the taper external pipe threads, taper internal pipe threads and parallel internal pipe threada(3).

Note (3) These parallel internal pipe threads are to be used for the taper external pipe threads, and differ in tolerance from the parallel internal pipe threads spe~ified in JIS B 0202.

3. Basic Profile, Basic Dimensions and Tolerances

The basic profil~. basic dimensions and tolerances of the taper pipe threads shall be as specified in Attached Table.

Applicable Standards and Reference Standards: See page 2.

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2 B 0203-1982

4. Desi8llation

The threads specified in the text of this standard shall be designated by the designation of thread given in Attached Table. Here, the notation R denotes the taper external threads, the notation Rc the taper internal threads and the notation Rp the parallel internal threads.

Example: For taper external threads, R Ii

5. Inspection

For taper internal threads, Rc l~

For parallel internal threads, Rp l~

The threads having been screwed in accordance with this stsndard shall, as a rule, be inspected with a screw thread gauge for taper pipe threads specified in JIS B 0253.

Applicable Standards:

JIS B 0202-Para11e1 Pipe Threads

JIS B 0253-Screw Gauges for Taper Pipe Threads

Reference Standards:

JIS G J452-Carbon Steel Pipes for Ordinary Piping

ISO 7/1-1978 Pipe threads where pressure-tight joints are made on the threads - Part 1: Designation, dimensions and tolerances

ISO 1179-1973 Pipe connections for plain end steel and other metal tubes in industrial applications

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3 B 0203-1982

Attac:hed Table Basic Profiles, Basic Dimensions and Tolerances

Basic Profile Applied for Taper External and Taper Internal Threads

.~

Axi. efth .. od-4-.-----.-.c?¥ Thick continuous line shows basic profile.

p = 25.4 n

H = 0.960237 P

h ~ 0.640327 P

I' == 0.137278 P

Basic Profile Applied for Parallel Internal Threads

Axil of thre-'

Thick continuous line shows basic profile.

p 25.4 == --n

H' == 0.960491 P

" = 0.640327 P

r' = 0.137329 P

Fit between Taper External Thread and Taper Internal or Parallel Internal Thread

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4 B 0203-1982

Attached Table (Continued)

Unit: DIll

"' .... ~dl •. Pa.mDflGt .......... _ Lentth Dt UNIII' t"'- 11'I'Iin.'

15 ....... 'hrwd Intam" e."::1 r.1fttlI.hr ....

Sin ot qfban ....

('l hi...,.' Ihrwd "m" T_· -'':'''''" -- "' ... r..,onfi...,v ._. _Oft I:='':

u_ -"III ..

Pilch From piP' IfNI At pi,.. - IG'-Iot .... ~ ~&II •. P'to;h rNa. Mlnordlt. .... T_ - ,_ ...... ..-.. , "" .... -- ... ..... D.D, F_ l"tHNi ' ... ..,..1 ~-tianel of d .d, d, ~1~ -.f P , - ..... -.. - .h_ , .... ...

~ From • a_ A.lal ...... ...... F .... U. .. ' ...... . -. .-. D, .... ... _.1 -.... tnhl.nll'thor .. 11 ., - :!.:'" ...... ....... .... .. ..

~ ... 1 COIw .. h " _".,

. - -" ....' Clualdo ",,,,, . ....... tM ...... ' - /' ...... .... -...... , ""'o.dil. Pitc:hdia MlftOI'dl •• a ±b ±< "' ..... ....... ,GMft -n D D, D, ± f .Ia. ,tid .. , ..... I -, I

R tlJl 28 0.9071 D.SS1 D. 12 7.723 7.142 6.561 3.97 0.91 1.13 0.071 2.5 6.2 7.' 4.4 - -R ./. 28 . 0.9071 O. SSI O. 12 9.728 9.147 8.566 3.97 0.91 1.13 0.071 2.5 6.2 7.4 4.4 10.5 2.0

R 'I. 19 1.3368 0.85/ 0.18 13.157 12. 301 11.445 6.01 I.M 1.67 0.104 3.7 9.4 II. 0 6. 7 13.8 2.3

R 'I. 19 1.3368 0.8S! 0.18 16.662 15.806 14.950 6.35 1.34 1.67 0.104 3.7 9. 7 11.4 7.0 17.3 2.3

R II. 14 1.8143 1.16l 0.25 20.955 19.793 18.631 8. 16 1.81 2.27 0.142 5.0 12. 7 15.0 9.1 21. 7 2.8

R J/4 H 1.8143 1.162 0.25 26.441 25.279 24.117 9.53 1.81 2.27 0.142 5.0 U. I 16.3 10.2 27.2 2.8

RI 11 2.3091 U79 0.32 33.249 31. 770 30.291 10.39 2.31 2.89 0.181 6.4 16.2 19. 1 11.6 34 3.2

R 1'/. 11 2.3091 1.479 0.32 41.910 40.431 38.952 12. 70 2.3\ 2.89 0.181 6.4 18.5 21.4 13.4 42. 7 3.5

·R \'1. l! 2.3091 1.479 0.32 '7.S03 46.324 44.845 12.70 2. 31 2.89 0.\81 6.4 18.5 21.4 13.4 48.6 3.5

R2 11 2.3091 1.4~ O. a2 S9.~14 58.U5 56.656 15.88 2.31 2.89 0.181 7.5 22.8 25. 7 16.9 60.5 a. B

R 2'/. 11 2.3091 1.47~ D.32 15.184 73.1051 72.225 17.46 3.46 3.46 0.216 9.2 26. 7 30.1 18.6 76.3 4.2

R3 II 2.3091 1.479 0.32 87.884 86.~S 84.925 2D.M 3.46 3.46 0.216 9.2 29.8 33.3 21. I 89.1 4.2

R4 11 2.309\ 1.479 0.32 lI3.03D ) II. 551 IlD.072 25.40 3.46 3.46 0.216 10.4 35.8 '39.3 25.9 \14.3 4.5

R5 11 2.3091 1.479 0.32 138.430 136.951 135.472 28.SS 3.46 3.46 0.2\6 1l.S 40.1 43,5 29.3 139.8 4.5

R6 11 2.3091 1.479 0.32 163.830 162.351 160.872 28.SS 3.46 3.46 0.216 11.5 ~.I 43.5 29.3 165.2 5.0

Note (4) This designation i. for taper external thread; for taper or parallel internal thread. the notation R shall be substituted by Re ana Hp. respectively. (See 4.)

Reaa.arka 1. Tl!,e notations I, Re: and Rp In the table representlns pipe tbreads _y be a1litted 8S

riecessary.

2. The thread shall be pe~pp.ndlcular to the axIs. and the pitch ."all be E8sured in parallel with the axis.

3. The length of useful thread is thll length of C'OIDpletely ticrewed part. Enu.:epl: the Lallit several thread$ which may be truncated at the crest by its intersection with the cylindrical surface of tbe pipe or coupler. Th~ cb~fered end of the pip@ or coupler. if any. 18 included In the length of useful thread pliTt •

.4. When it is difficult to make the dlDenSion a, lOT t conform to the f'1gure in this table, r~fer 1t to the appropriate standard of the component.

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5 B 0203-1982

Appendix Taper Pipe Threads Not Comprehended in ISO 7/1

1.. Sc.ope

This App~ndlx speeifies the taper pipe threads not comprehended in ISO .7/1. and shall be appli~d to the threads used mainly for pressure-tight joints on the threads to joint pipes, pipe fittings. fluid machinery. etc ..

The study for and against the existence of the thread specification in this Appendix is scheduled on every occasion of revie~1ng this standard.

2. Classification

The taper pipe threads are classified into the taper external pipe threads J taper internal pipe threads and parallel internal pipe threads(l).

Note (1) These parallel internal pipe threads are to be used for the taper external pipe threads, and differ in toleranc.e from the parallel internal pipe threads specified in Appendix of JIS B 0202.

3. Basic Profile, Basic Dimensions and Tolerances

The basic profile, basic dimensions and tolerances of the taper pipe threads shall comply with Appendix Table.

4. Designation

The threads complying with this Appendix shall be designated by the designation of threads given in Appendix Table. Here, for denoting the parallel internal pipe threads mating taper external pipe threads, the notation PS shall be used in place of PT.

Example:

5. Inspection

For taper external pipe threads and taper internal pipe threads, PT ~

2

For parallel internal pipe threads mating taper external pipe threads, PS Jl

2

The threads having been screwed in accordance with this Appendix shall be made, as a rule, with a taper screw thread gauge specified in JIS B 0253.

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6 B 0203-1982

Appendix Table Basi~ Profiles, Basic Dimensions and Tolerances

Basic Profile Applied for Taper External and Taper Internal Threads

A.is of \htwMlJi- ._--,-....,;:=::,:§3 I. L...j . Thick continuous line shows basic profile.

p = 25.4

" H= 0.960237 P

h = 0.640327 P

r = 0.137278 P

Basic Profile Applied for Parallel Internal Threads

Axis of th"'ad

Thick continuous line shows basic profile.

p 25.4 =--"

fl' = 0.960491 P

" = 0.640327 P

r' = 0.137329 P

Fit between Taper External Thread and Taper Internal or Parallel Internal Thread

~--'~--:--'1' ~ ~ . . Position of gauge pi.,.

~~T.~p.r~;n .. ~rntl·It~~",~ad~~.fT 1< --'---1 QIJ~

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7 .. B 0203-1982

Appendix Table (Continued) Unit: mot

nw.d GtwII~.

-"·~I~-:~ I.lInrI*h 0' IIMrUllh ..... ~mt .. J

Tolar· 1:':"II1II ."tI,na' tlvNd e ... ...,.1 threMI Ell'.............. .... .. an SiN 01 clllboft 1.1 ,WMI't Inwa.. -- ~ lar DIGn .. ",

1'1) A .... .,. D D i~ .:.:.:. piPing Fro", ppe ~M wnd • f t=fOlll'l tIv.t PI" :-- IGiven 'Or ............ paaltion Teper , .. 11" ._ ...... rlilllu~1

0.1IM· ~f :I ,. Md or 111111 Inlllm" int_1 :.=--~-. MIlOt cIt"1 Pl1eh dI"IMftor dill.

d d1. d. t'_oJ .t .... D. p"'. ..... Ih..... ~_ , ....... &use AIlJaiI A ... --..

(ill Elf """h 10 ... • "*,,. 01 lowwd Ffom Fr_ F,_ as." 1""'1U1 Ul'Nd pill'''' lII.fIII' poullon lI!'do' ~

I!~ - 1IIfI .. dl •• end o~~ Plpeor p ..... or ", ... 1 It r' Iftl_nlll pi.... ICDUpII'f fI!Id at 0ut5kk'

MIlord .. .... dI di. Minordi. thNllld la-m I' pi .. ar d ..

• D Dz DI tJ :l::b ±r::: ± f Imlil. (G~ coupktr

:~ I :~i' t

PT -I. 28 0.9071 0.581 0.12 9.728 9. HI 8.5M 3.97 0.91 1.13 0.071 2.5 6.2 1." •. 4 )O.S

P l' I/~ 19 l. 336ft CJ.DS6 0.18 IS. 151 ]2.301 H . .ws 6.01 1. 34 1. 67 0.J04 S.7 9.4 11.0 6.7 13.8

PT II. 19 1.3368 0.856 0:18 16.662 15.n06 l·t 950 6.35 1.3" 1. 67 0.10·' 3,7 9.7 11." 1.0 11.3

PT'/I 14 l.8B3 1.16~ 0.25 20.955 19.793 18.631 B.lli J. 81 2.21 0.142 5.0 12.7 15.0 9.1 21.1

PT 1/ .. 14 l. 0143 1.162 0.25 ~ .• "1 25.279 .24.117 9.53 l. 81 2.27 0.142 5.0 14..1 16. a lU.2 21.2

PT l 11 2. 309J 1.479 0.32 33.~49 31.710 30.291 10.39 2.al 2.89 o. un 6.-i 16.2 19.1 11.5 34.0

PT lilt n 2.3091 .1. ... n 0.32 .J1.9U oIO.-I3J :;R.~5~ 12. 7n 2.31 2.89 0.18' 6 . .t 18.S 21. ~ u .• 4-2.7

PT 11/1 n ~.3091 1. '7~ 0.32 47.103 46.32" «.145 12. 'in 2.31 2.89 0.101 G.' 18.5 21. " 13-" 48.6

PT 2 11 ~.3091 1. .,9 0.32 59.GB 58. 135 5tl.65~ 15. Of! 2.31 2.09 O. 181 7.5 22.8 2$. 7 16.9 6O.S

PT 21/'j 11 2.309' 1.>i7t 0.32 75.1B4 73. 7DF 72.2!lG 17. ·.6 3 .... 6 l.4fl O.2l6 9.2 26.1 30.} 18.6 715.3

PT a 11 2,3091 1.479 0.32 81.IlO~ 00.40:- 801.926 20.6·' 3.46 3.46 0.216 9.2 29.8 3S.3 2l.1 69.1

I'T 31/t. 11 2.3091 J • .J79 0.32 100.'83n 93.115) 97. 37~ 22.2.1 3."6 3.-46 O.2M 9.2 31.4 301.0 22 .... J01. 6

PT .- 11 2.3091 1. 4.19 0.32 113.030 111.551 110.07.:1 25.'0 S_" 3."6 0.216 10.4 35.8 39.8 25.9 Ill.!

PT 5 11 2.309J 1.479 0.82 138.,uO 136. ~51 13S.47:1 2B.58 3.ot6 .lt~6 O.21fi U.S :JO.l 43.5 19.3 139.B

PT 6 11 2..809J 1.4.79 0.32 163.830 162.351 )60.872 20.SU 3.46 3.46 O.JllI n.s &0.1 43.5 29.3 165.2 -

PT 7 11 2.309J J.419 0.32 189. 2l~IIJ7_ 751 136.27'2 :H.93 S 08 5.08 0.31A 14.0 ·JR.9 Sf. 0 I 35.l I !90.71

PT 8 11 2.:1091 1.479 0_32- 2B.63<1 2U.J!'il 211.672 38.10 S.nR 5. DO O.~I~ B.O 52.1 57.2 37. (i I 2Hi. 31

p'r 9 Ii 2.3091 1. .t19 0.32 2"'0.030 233.551 237.072 3R. tnl 5.08 5.08 O. aJ. 14.0 52. 1 51.2 37.6 1U 81

PT10 1-1 2.3091 l. 419 D.32 2li5 .• 30 263.951 262.-1.72 R~I ".00 !i. OS o·t~·J 60.-' ·Ui.2 2(,7 .. J

.1' T 12- 11 2.309111 ~j~ 0.32 3Ui.23,:U.L 75. 11:1. 272 -IL 2" ('.:15 6.35 ... 17.ft !iR.n (i~ I 41.·9 JIR "l Note (2) this deslsnation te for taper external and tape~ interna~ threads. and for the parallel

internal threads .. tinl taper e~ternal threads. the ~otatlon PT sball be aubstltuted by 'S. (Se. 4. in Append!x.)

ae.arks 1. the aotation5 PI and PS in the table representing taper pipe threads may be Q.itt~d as necessary.

2. The thread Ihatl be perpendicular to the axis. and the pitch shall be measured in parallel with the a~is.

3. Tbe iensth of useful thread is the length of completely acrewed part, except the last leveral threads which may be truncated at the crest by its intersection with the ~yl1ndrical surf.ee of the pipe ar coupler. The chamfeted end of the pipe or coupler, if any, is included in the lensth of useful thread part.

4. Wben. it is difficl1lt. to .... ke the diUll!:l'Ision a. f or I eanform to the fi.Bure in thi$ table. refer it to the appropriate standard of the component.

5. Th_ eontent. ot cbis Table in enclosed zone. are Due of specification of tb1a Appendiz. but are the same as those for the threads oE 11/8 to R3 Bnd l4 to R6 in desiination .pecified in Appendix of the text. However. i~ i. recommended that these should not be used frOM the viewpoint of harmonization with ISO standards. 8in~e the designation of threads are different.

T!>.cIt· ....

2.0

2.3

!.3

2.8

2.8

3.2

3.S

3.5

3.0 •

I • 4.21 4.2

4.2

4.5 t ul 5.0 •

S.3

S.B

6.2

U 6

6.9

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B 0203-1982 Edition 11 ----------_ .. _-----------.--. __ ._--_.-

Japanese Text

Established by Minister of International Trade and Industry

Date of Establishmen t: 1952-03-08

Date of Revision: 1982-03-01

Date of Reaffirmation: 1992-10-01

Date of Public Notice in Official Gazette: 1992-10-26

Investigated by: Japanese Industrial Standards Committee

Divisional Council on Machine Elements

Technical Committee on Screw Threads (Basic)

--------_._------_._------This English translation is published by:

Japanese Standards Association 1-24, Akasaka 4, Minato-ku,

Tokyo 107 Japan © JSA, 1982

Printed in Tokyo by HohbWl,ha Co., Ltd.

~~ JIB B0208:82

Appendix Ta~le O)1'a¥a)3$?} (p 4, 7)

8 *18 =<D l'~:i:n t ms t.Js t:t.lt 'iJ-e-

~m ~ <D When there is no incomplet~ thread part

S*m : <ID r-J"6I)tll;, ~ff&IJtl t

~ia ~ @ Taper internal thread, paraUel internal thread