1、BRITISH STANDARD BS EN ISO 228-1:2003 Pipe threads where pressure-tight joints are not made on the threads Part 1: Dimensions, tolerances and designation The European Standard EN ISO 228-1:2003 has the status of a British Standard ICS 21.040.30 BS EN ISO 228-1:2003 This British Standard was publishe
2、d under the authority of the Standards Policy and Strategy Committee on 26 February 2003 BSI 26 February 2003 ISBN 0 580 41320 9 National foreword This British Standard is the official English language version of EN ISO 228-1:2003. It is identical with ISO 228-1:2000. Together with BS EN ISO 228-2:2
3、003, it supersedes BS 2779:1986 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ISE/19, Ferrous pipe fittings (excluding cast iron), which has the responsibility to: A list of organizations represented on this committee can be obtained on request to i
4、ts secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electroni
5、c Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to under
6、stand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprise
7、s a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii and iii, a blank page, pages 1 to 8, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments
8、issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO2281 February2003 ICS21.040.30 Englishversion Pipethreadswherepressuretightjointsarenotmadeonthe threadsPart1:Dimensions,tolerancesanddesignation(ISO 2281:2000) Filetagesdetuyauteriepourraccordementsan
9、stanchit danslefiletPartie1:Dimensions,tolranceset dsignation(ISO2281:2000) RohrgewindefrnichtimGewindedichtendeVerbindungen Teil1:Mae,ToleranzenundBezeichnung(ISO228 1:2000) ThisEuropeanStandardwasapprovedbyCENon15November2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichsti
10、pulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,Fren
11、ch,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,I
12、celand,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,SlovakRepublic,Spain,Sweden,Switzerland and UnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinany
13、formandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO2281:2003EForeword ThetextofISO2281:2000hasbeenpreparedbyTechnicalCommitteeISO/TC5“Ferrous metalpipesandmetallicfittings“oftheInternationalOrganizationforStandardization(ISO)and hasbeentakenoverasENISO2281:2003byTechnicalCommittee
14、ECISS/TC29“Steeltubes andfittingsforsteeltubes“,thesecretariatofwhichisheldbyUNI. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationof anidenticaltextorbyendorsement,atthelatestbyAugust2003,andconflictingnational standardsshallbewithdrawnatthelatestbyAugust2003. Accordi
15、ngtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsof thefollowingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy, Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Swede
16、n,Switzerlandand theUnitedKingdom. Endorsementnotice ThetextofISO2281:2000hasbeenapprovedbyCENasENISO2281:2003withoutany modifications. ENISO2281:2003Reference number ISO 228-1:2000(E) INTERNATIONAL STANDARD ISO 228-1 Fourth edition 2000-09-01 Pipe threads where pressure-tight joints are not made on
17、 the threads Part 1: Dimensions, tolerances and designation Filetages de tuyauterie pour raccordement sans tanchit dans le filet Partie 1: Dimensions, tolrances et dsignation ENISO2281:2003ii ENISO2281:2003 iii Foreword ISO (the International Organization for Standardization) is a worldwide federati
18、on of national standards bodies (ISO member bodies). The work of preparing 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 committee
19、. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance w
20、ith the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn
21、 to the possibility that some of the elements of this part of ISO 228 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 228-1 was prepared by Technical Committee ISO/TC 5, Ferrous metal pipes and metallic
22、fittings, Subcommittee SC 5, Threaded or plain end butt-welding fittings, threads, gauging of threads. This fourth edition cancels and replaces the third edition (ISO 228-1:1994), which has been technically revised. ISO 228 consists of the following parts, under the general title Pipe threads where
23、pressure-tight joints are not made on the threads: Part 1: Dimensions, tolerances and designation Part 2: Verification by means of limit gauges Annex A of this part of ISO 228 is for information only. ENISO2281:2003INTENRATIONAL TSANDADR ISO -8221:(0002)E1 Pipe threads where pressure-tight joints ar
24、e not made on the threads Part 1: Dimensions, tolerances and designation 1 Scope This part of ISO 228 specifies the requirements for thread form, dimensions, tolerances and designation for fastening pipe threads, thread sizes 1/16 to 6 inclusive. Both internal and external threads are parallel threa
25、ds, intended for the mechanical assembly of the component parts of fittings, cocks and valves, accessories, etc. These threads are not suitable as jointing threads where a pressure-tight joint is made on the thread. If assemblies with such threads must be made pressure-tight, this should be effected
26、 by compressing two tightening surfaces outside the threads, and by interposing an appropriate seal. NOTE 1 For pipe threads where pressure-tight joints are made on the threads, see ISO 7-1. NOTE 2 ISO 228-2 gives details of methods for verification of fastening thread dimensions and form, and recom
27、mended gauging systems. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this part of ISO 228. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, p
28、arties to agreements based on this part of ISO 228 are encouraged to investigate the possibility of applying the most recent editions of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain r
29、egisters of currently valid International Standards. ISO 7-1:1994, Pipe threads where pressure-tight joints are made on the threads Part 1: Dimensions, tolerances and designation. ENISO2281:20032 3 Symbols For the purposes of this part of ISO 228, the following symbols apply. A Tighter class of tole
30、rance of external pipe threads where pressure-tight joints are not made on the threads B Wider class of tolerance of external pipe threads where pressure-tight joints are not made on the threads D = d; major diameter of the internal thread D 1 = D 1,280 654 P = d 1 ; minor diameter of the internal t
31、hread D 2 = D 0,640 327 P = d 2 ; pitch diameter of the internal thread d Major diameter of the external thread d 1 = d 1,280 654 P; minor diameter of the external thread d 2 = d 0,640 327 P; pitch diameter of the external thread G Pipe thread where pressure-tight joints are not made on the threads
32、H Height of the fundamental triangle of the thread h Height of the thread profile with rounded crests and roots P Pitch r Radius of rounded crests and roots T D1 Tolerance on the minor diameter of the internal thread T D2 Tolerance on the pitch diameter of the internal thread T d Tolerance on the ma
33、jor diameter of the external thread T d2 Tolerance on the pitch diameter of the external thread 4 Dimensions The profile of these threads is identical with that of the parallel thread specified in ISO 7-1. The internal and external threads covered by this part of ISO 228 are both parallel. Unless ot
34、herwise specified, the thread in accordance with this part of ISO 228 is a right-hand thread. (See also clause 5.) Threads are normally of the truncated form, with crests truncated to the limits of tolerance as given in columns 14 and 15 of Table 1. The exception to this is on internal threads, wher
35、e they are likely to be assembled with external threads in accordance with ISO 7-1, and in which case the thread length shall be equal to or greater than that specified in ISO 7-1. The tolerances on the pitch diameter of the internal threads correspond to the positive deviation of the diameter toler
36、ances in ISO 7-1, with the exception of those for thread sizes 1/16, 1/8, 1/4 and 3/8, for which slightly higher values are specified. ENISO2281:2003 3 For external threads, two classes of tolerances on the pitch diameter are specified (see Table 1). Class A (column 10) consists of entirely negative
37、 tolerances, each equivalent in value to the tolerance for the respective internal thread. Class B (column 11) consists of entirely negative tolerances, each with a value of twice that of the respective internal thread. The choice between class A and class B depends on the conditions of application
38、and shall be made in product standards where threads in accordance with this part of ISO 228 are specified. Pipe thread dimensions, in millimetres, are given in Table 1. ENISO2281:20034 ISO 2000 All rights reserved Figure 1 shows fastening threads with full-form profiles and their tolerance zones. K
39、ey 1 Internal thread 2 External thread 3 Fundamental triangle a H = 0,960 491 P b h =0, 6 403 27P c r = 0,137 329 P Figure 1 Full-form thread profile and tolerance zones Figure 2 shows fastening threads with truncated profiles and their tolerance zones. Key 1 Internal thread 2 External thread 3 Fund
40、amental triangle a H = 0,960 491 P b h =0, 6 403 27P c r = 0,137 329 P Figure 2 Truncated-form thread profile and tolerance zones ENISO2281:2003 5 Table 1 Thread dimensions Dimensions in millimetres Tolerances on pitch diameter a) Tolerance on minor diameter Tolerance on major diameter Diameters Int
41、ernal thread T D2 External thread T d2 Internal thread T D1 External thread T d Pitch Height of thread major pitch minor Lower deviation Upper deviation Lower deviation Lower deviation Upper deviation Lower deviation Upper deviation Lower deviation Upper deviation Desig- nation of thread Number of t
42、hreads in 25,4 mm Phd = D d 2 = D 2 d 1 = D 1 Class A Class B 1234567891 01 11 21 31 41 51 6 1/16 28 0,907 0,581 7,723 7,142 6,561 0 + 0,107 0,107 0,214 0 0 + 0,282 0,214 0 1/8 28 0,907 0,581 9,728 9,147 8,566 0 + 0,107 0,107 0,214 0 0 + 0,282 0,214 0 1/4 19 1,337 0,856 13,157 12,301 11,445 0 + 0,12
43、5 0,125 0,250 0 0 + 0,445 0,250 0 3/8 19 1,337 0,856 16,662 15,806 14,950 0 + 0,125 0,125 0,250 0 0 + 0,445 0,250 0 1/2 14 1,814 1,162 20,955 19,793 18,631 0 + 0,142 0,142 0,284 0 0 + 0,541 0,284 0 5/8 14 1,814 1,162 22,911 21,749 20,587 0 + 0,142 0,142 0,284 0 0 + 0,541 0,284 0 3/4 14 1,814 1,162 2
44、6,441 25,279 24,117 0 + 0,142 0,142 0,284 0 0 + 0,541 0,284 0 7/8 14 1,814 1,162 30,201 29,039 27,877 0 + 0,142 0,142 0,284 0 0 + 0,541 0,284 0 1 11 2,309 1,479 33,249 31,770 30,291 0 + 0,180 0,180 0,360 0 0 + 0,640 0,360 0 11 /8 11 2,309 1,479 37,897 36,418 34,939 0 + 0,180 0,180 0,360 0 0 + 0,640
45、0,360 0 11 /4 11 2,309 1,479 41,910 40,431 38,952 0 + 0,180 0,180 0,360 0 0 + 0,640 0,360 0 11 /2 11 2,309 1,479 47,803 46,324 44,845 0 + 0,180 0,180 0,360 0 0 + 0,640 0,360 0 13 /4 11 2,309 1,479 53,746 52,267 50,788 0 + 0,180 0,180 0,360 0 0 + 0,640 0,360 0 2 11 2,309 1,479 59,614 58,135 56,656 0
46、+ 0,180 0,180 0,360 0 0 + 0,640 0,360 0 21 /4 11 2,309 1,479 65,710 64,231 62,752 0 + 0,217 0,217 0,434 0 0 + 0,640 0,434 0 21 /2 11 2,309 1,479 75,184 73,705 72,226 0 + 0,217 0,217 0,434 0 0 + 0,640 0,434 0 23 /4 11 2,309 1,479 81,534 80,055 78,576 0 + 0,217 0,217 0,434 0 0 + 0,640 0,434 0 3 11 2,3
47、09 1,479 87,884 86,405 84,926 0 + 0,217 0,217 0,434 0 0 + 0,640 0,434 0 31 /2 11 2,309 1,479 100,330 98,851 97,372 0 + 0,217 0,217 0,434 0 0 + 0,640 0,434 0 4 11 2,309 1,479 113,030 111,551 110,072 0 + 0,217 0,217 0,434 0 0 + 0,640 0,434 0 41 /2 11 2,309 1,479 125,730 124,251 122,772 0 + 0,217 0,217 0,434 0 0 + 0,640 0,434 0 5 11 2,309 1,479 138,430 136,951 135,472 0 + 0,217 0,217 0,434 0 0 + 0,640 0,434 0 51 /2 11 2,309 1,479 151,130 149,651 148,172 0 + 0,217 0,217 0,434 0 0 + 0,640 0,434 0 6 11 2,309 1,479
