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1、.,. I 8 INTERNATIONAL ISO STANDARD 7-1 Third edition 1994-05-15 r) 1/; , ; 8 ISO Reference number ISO 7-1:1994(E) ,- “- ISO 7-1 :1994(E) . Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of prepari
2、ng International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that cf!1n:itee. Inernational organization.s, governmental .- and non-governmental, In
3、 liaison wlth ISO, also take part In the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publi
4、cation as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 7-1 was prepared by Technical Committee ISOfTC 5, Ferrous metal pipes and metallic fittings, Subcommittee SC 5. Threaded or plain end butt-welding fittings, threads,
5、 gauging of threads. This third edition cancels and replaces the second edition (ISO 7-1: 1982). which has been technically revised. ISO 7 consists of the following parts, under the general title Pipe threads where pressure-tight joints are made on the threads: -Part 1: Dimensions, tolerances and de
6、signation .! -Part 2: Verification by means of limit gauges Annex A of this part of ISO 7 is for information only. (;) ISO 1994 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including
7、photocopying and microfilm, without permission in writing from the publisher. International Organization tor Standardization .Ca se Postale 56. CH-1211 Geneve 20. Switzerland Printed in Switzerland ii I I INTERNATIONAL STANDARD CI ISO ISO 7-1:1994(E) ( t Pipe threads where pressure-tight joints are
8、made on1 the threads - , Part 1: Dimensions, tolerances and designation 1 Scope maintain registers of currently valid International Standards. This part of ISO 7 specifies the requirements fr thread form, dimensions, tolerances and designation ISO 7-2:1982, Pipe threads where pressure-tight fr joint
9、ing pipe threads, sizes 1/16 to 6 inclusive, fr joints are made on the threads -Part 2: Verification joints made pressure-tight by the mating of the by means of limit gauges. threads. These threads are taper external, parallel interna! or taper internal and are intended fr use with pipes suitable fr
10、 threading and fr valves, fittings or 3 Definitions other pipeline equipment interconnected by threaded joints. For the purposes of this part of ISO 7, the following definitions apply (see also figures 3 and 5). An appropriate jointing medium should be used on the thread to ensure pressure-tight joi
11、nts. 3.1 gauge diameter: Major diameter of the thread, NOTES whether external or internal. ,32.I.h.h. 1 Parallel external pipe threads are not suitable as jointing .major cone: maglnary cone W IC Just touches threads. the crests of a taper external thread or the roots of a taper internal thread. 2 F
12、or pipe threads where pressure-tight joints are not made on the threads, see ISO 228-1. 3.3 gauge plane: Plane, perpendicular to the axis 3 ISO 7-2 gives details of methods of verification of joint- of the taper thread, at which the major cone has the ing thread dimensions and form and recommended g
13、auging gauge diameter. systems. NOTE 4 For extern al threads the gauge plane is located at a distance equal to the nominal gauge length from the .small end of the thread. For interna I threads the gauge plane 2 Normative reference is located at a distance of half-pitch behind the face of the threade
14、d part. This is in order to give consideration to the The following standard contains provisions which, start of the thread that has been removed by chamfering. through reference in this text, constitute provisions of this part of ISO 7. At the time of publication, the 3.4 gauge length: On an extern
15、al thread, the dis- edition indicated was valid. All standards are subject tance from the gauge plane to the small end of the to revision, and parties to agreements based on this thread. 8 part of ISO 7 are encouraged to investigate the pos- sibility of applying the most recent edition of the 3.5 re
16、ference plane: Visible surface of each of the standard indicated below. Members of IEC and ISO internally and externally threaded parts, which facili- I ISO 7-1:1994(E) () ISO () tates the reading of the gauge when the thread is in- P Pitch spected. H Height of the triangle of the thread profile per
17、- For interna I threads it is the face of the internally pendicular to the thread axis threaded part, fr external threads it is the small end of the externally threaded part. h = 0,640 327 P; helght of the thread profile be- tween rounded crests and roots perpendicular 3.6 complete thread: That part
18、 of the thread which to the thread axis is fully formed at both crest and root. Rd. fddtdtr alus 0 roun e cres s an roo s NOTE 5 When there is a chamfer at the start of the DM.d.tf th. tI th edt thehddh.Ihh.I dd.aJor lame er 0 e In erna raa t rea not excee Ing one pltC In engt ,t IS IS Inc u e In .
19、the length of complete thread. gauge plane (gauge diameter -see 3.1) 37.ItthdThtrtfththdD, D -1,280654 P; minor diameter of the internal .Incompe e rea: a pa 0 e rea hdthIt rea at e gauge p ane whlch IS fully formed at the root, hut truncated at the crest by its intersection with the cylindrical sur
20、face of D2 D -0,640 327 P; pitch diameter of the interna! the product. thread at the gauge plane f) 3.8 washout thread; vanish thread: That part of d Major diameter of the external thread at the the thread which is not fully formed at the root. gauge plane (gauge diameter -see 3.1) NOTE 6 The washou
21、t thread is produced by the bevel at d, = d -1 ,280 654 P; minor diameter of the ex- the start of the threading tool. ternal thread at the gauge plane 3.9 useful thread: Complete thread plus incomplete = d -0,640 327 P; pitch diameter of the ex- thread, excluding the washout thread. ternal thread at
22、 the gauge plane 3.10 fitting allowance: Length of useful thread be- T, Tolerance on the gauge length of an external yond the gauge plane of an external thread required thread to provide fr assembly with an internal thread at the TIfh f hIItf tht IT 2 0 erance or t e position 0 t e gauge p ane on up
23、per Iml 0 e 0 erance. . I hdan Interna t rea NOTE 7 Internally threaded parts will have a sufficient length to accommodate the fitting allowance, except when 5 Dimensions they have a free run-out. See 7.2.2. h.11LhffI hdPipe thread dimensions, in millimetres, are given in 3.11 wrenc Ing a owance: en
24、gt 0 use u t rea t bl 1 wh ich is provided to accommodate the relative a e .V movement between the end of the externally threaded part and the internally threaded part required fr wrenching beyond the position of handtight en- 6 Designation gagement. The designation of threads according to this part
25、 of ISO 7 shall consist of the following elements in the sequence given: 4 Symbols 6.1 The description block shall be: Rp Parallel internal pipe thread where pressure-tight joints are made on the threads Pipe thread Rc Taper internal pipe thread where pressure-tight joints are made on the threads 6.
26、2 The International Standard number block shall be: R Taper external pipe thread where pressure-tight joints are made on the threads ISO 7 e 1 2 , , , Q ISO ISO 7-1 :1994(E) ( i Table 1 -Thread dimensions Dimensions in millimetres E : :! -; ot ot N N 0 0 0 0 co co co co co 9E -= 8- “. C O Ootot Q) “
27、 m 0 c. oo NN NNN.c - N E 000 000 000 000 000 Q)E 9 0 a c.5; +1+1+1 +1+1+1 +1+1+1 +1+1+1 +I+I+I:EE ro C 0 .co g :. -o -E E 0 :.c - . ototot ototot ototot ot N E-C Q) in 8 50 MMM MMM MMM ;:-otot ;:-1n1n.E “ -6 Qc I-.c NNN NNN NNN M ot Q).c . c -.c- c co c .0 ;:- Q) , . 0 Q) .c J LL.- otlnln .E 0 .c-
28、, -; -In. In. “. “. o. o. ot. ot. ot. In. N. N. c 0) - 0 p N NNM Mlnln cococo “,mm 0,9- Q)- -Q) 0) oc -6 c Q)Q) 0) C .A66.c.c C -“.uele na ot “ In N M M co co -,- M ,.i. 0 COCOot “ “C “5 C wnWIUIW./O- In In“ E . -C - -c c Et) 0 .2 c ( :. ;. ,uele6na6 -ot M ot ot N M M co co Qj 8- O) c8M “ CD o.c .In
29、. ,. po wnwlxaw .O ,:,: co m In 0 M m M M Q) “ c c .c-. -NN NMM Motot“O: :c E ; -S. .E .2 ! i i ,uel e6na6 In In -N In - ot a a - .c :. 0. 8 “ - . aulwou ./0- co“ co“ 0; 0 M“ ot“ co“ 0; 0; M“ co“ 0; In“ o 0 -“ 0) C Ir . - - NNN Motot , c- .co .c gQ) -C c-5 c -C ot ot ot ot ot ot ot ot ot ot “ N N N
30、N : g . 8. 5- .c o. c_ -“- -Q)O “ 0) po 0- 50 - - - 0.0) .E. c o N I- -6 - - - S O “5.“ c- t) Q)Q) U C -c.- -a.- Q) Q) 0 .-. Q) Q).c .c0. .-c -+I .c- - “ 0 _.c - -Q) “ “0 g, g I- -. . . “. M. M. 0. 0. m. m. In. In. In. In. In. 0 0 -6 po I- c N - NN NNN NMM MMM “ 8 Q- Q).c .cE .c :. 0) Q) E -c.c .P.
31、c .otot coo m :. Ci. -0 -o. .c N C ot“- c Ec- poE -M“ M“ ot“ In“ co“ ,: - NNN.c .c :. -_U O)E E 0) .cC “: S C X -M_DM “00 NO m- S .c Q) cf; c .c:?: p vv, ,- “ -0. P Q)Eot ot “, ,: 0 N In In ot a N N -0) C ot.- - NN NMM O)Q) c- .c c Q)-C :. -Q) -C C E-C O) E C C C “ “0 N N N N N I E “ .2.c 0 C_Q)Q) -
32、Q) 0 po 50 - -.ca; u“O X I-.c - E EQ) C .P. C -E Q) E .- -. = “,.c -.c E-C Q)= Q)- Q) +I .cE u- Q 0 ot 0 I- C 0 GI i I- -mmM Ma MMM Mlnln Inlnln In“S -OS “ -N oo NNN NM“M“ M“M“M“ NE Q)“O.P. E II Q) 0:. Q “ - - .cC 0.“, Q) C .u EQ).c- -SQj 00. -“ - UX EQ) ot N In ot. . . m. In. co. ot. co. co. -Q) Q)
33、 0.2 E ototCO co“ao; ONN 1n0 Inmm 0 E Q) 0 - N NNN “ u I Z .- -C C:- “ -Q) Q) 0.c -c u .cU- -Q)C NNN )- Q)“C coln O“ NIn co CO CO “.c Q)“C C 0 :;coot InM mlnot InNN Ootm _. 0Q) -C - v mco Nmm CONO .Q) - E,- c Inln. , 01n0 Cc Q)- . co“ot omot CONot MCO O u “Q. N MMot Ina - “,- cO) “ Q) Q)o. C Q)-6 -
34、Q) - u Q -0) cE COMm Oot Inlnln Inlnln Q):. g, 0 c “o OO “MN MOO 1n00M E ro-c Q) -“ M mN “otM ot .=0) - CD - . . CON = O)C 0 iL “,:o;N 1n01n OCO aMCO MCO EQ) C -Q; . N Motot Inr-m -6 “ C -0- -Q) -“ C -u Q) - Q)C E.c ; NIn OOM ototot 000 -CQ) -6 0 EOQ“ Ma1n COlnot otO a MMM Q)a; -c.P. Q) ._ “N comot
35、Nom COa 0. ot. a. t:E0 i In.E,. . Ma:3Q) CI- Q) .- “M COOCO M mln .c. i, Q .! m NN Mvot Ina ;: c “.c -“ Q), 0 Q)- “ ii u u 0) t:- , Q)- CC Q) .P. 0. E .c CO CONN mmm mmm mmm Q)E .P.Q) -C;: a-. mmln InCOCO “ r- “ Q) 00) Q)- -0 .c Inlna m ototot ototot ototot “,.c -:. -C E .c 000 O . C -Q) C O-C .c, -
36、 .-C- .c“ -, C .c-“ .c “ “otot moo 000 000 Q) o, E - “ DOM M 000 000000 E = c “ . 0. 0. M. M. a. m. M. M. M. M. M. M. M. M. M. - 0 OO - NNN NNN NNN“OM -CQ) Q) C Q)Q) - -0 -0 ot .c C- ww tSZ E CO. -; N UI Spae./“l m m 0 0 ot ot - - E 0 :! - “ .NN - I-11 :?: EJO .eqwnN -.S Q) I“OE 0. Q) “ 0 wQ)a; Ou 0
37、 E “teZ!S pae.“l CD . N . I- .f. E 8- LL.- -0 UOlRu61Seo!:. P -P N -“ .In CD 0 _. .c “Q)- ,.+, P- “-“ pp N ZO-CI- N 3 ISO 7-1:1994(E) () ISO I () 6.3 The individual item block shall be composed cf: the flanks in such a manner as to give the same thread height h as fr parallel threads. a) letter symb
38、ol(s) fr type of pipe thread -the letter R followed by the letter p fr parallel interna! threads; r :t: -the letter R followed by the letter c fr taper (conical) internal threads; -the letter R fr external threads; :t: .c: b) the thread size, from column 1 of table 1. EXAMPLES :t: The complete desig
39、nation fr a right-hand thread size P 1 1/2: Pitch Q C; Q 0 parallel Pipe thread ISO 7 -Rp 11/2 H = 0,960 491 P Internal h = 0,640 327 P .r = 0 137 329 P thread taper Pipe thread ISO 7 -Re 11/2 Figure 1 -Parallel thread External always Pi e thread ISO 7 -R 11/2 thread taper p 6.4 For left-hand thread
40、s, the letters LH shall be added to the designation. Right-hand threads require no special designation. 7 Thread design 7. 1 Thread forms 4) :t: .c: 7.1.1 Parallel thread 9 The basic form of the parallel pipe thread shall be as I shown in figure 1. The angle between the flanks, measured in an axial
41、plane section, is 55. The thread P -;. N p.t h profiles are rounded equally at crests and roots by I C !. .!. circular arcs blending tangentially with the flanks. ,; .:; :; 7.1.2 Taperthread t:J= The basic form of the taper pipe thread shall be as shown in figure 2. The taper is 1 to 16, measured on
42、 16 the diameter. The angle between the flanks, meas- ured in an axial plane section, is 55, the flanks making H = 0,960 237 P equal angles with the axis. h = 0,640 327 P r = 0,137278 P .The thread profiles are rounded off equally at crests and roots by circular arcs blending tangentially with Figur
43、e 2 -Taper thread 4“ CI ISO ISO 7-1 :1994(E) . 7.1.3 Direction of thread helix threads with free run-out shall be not less than 80 % of the values given in column 17 of table 1. (See Unless otherwise specified, the ISO 7-1 thread shall figure 4.) be a right-hand thread. (See also 6.4.) 8 Gauging 7.2
44、 Thread lengths For the verification of pipe threads, the plug and ring 7.2.1 External thread gauges used shall conform to ISO 7-2. The gauging always relates to a reference plane of the threaded The terms relating to the external taper pipe thread part to be verified (see figure 5). are given in fi
45、gure 3. The length of the useful thread, allowable in practice, 9 Combination with fastening thread is the sum of the lengths of the complete and in-Thb.t. ftIII I thdGt I.e com Ina Ion 0 an ex erna para e rea ,0- complete threads. excludlng the washout thread. TheIAB.d.th ISO2281erance c ass or In
46、accor ance WI - minimum length of the useful thread must be not less ththIthIthf.tt.Iwlth an Internal parallel thread Rp In accordance wlth an e minimum gauge eng p us e I Ing a - ISO 7 1d.I.dt. f7a.I-nee s specla consl era Ion. y owance. When it is necessary to have this combination, the 7.2.2 Inte
47、rna I thread positive or negative tolerance of the internal thread to ISO 7-1 shall be considered in the relevant product The design of internally threaded parts shall be such standards, where external parallel threads Gare used. that they can receive external threads up to the lengths given in column