AS-1722.2-1992.pdf

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1、AS 1722.21992 Australian Standard Pipe threads of Whitworth form Part 2: Fastening pipe threads Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 21 Jan 2008 This Australian Standard was prepared by Committee ME/28, Screw Threads. It was approved on behalf of the Council of Standards Australia on 15 Octo

2、ber 1991 and published on 17 January 1992. The following interests are represented on Committee ME/28: Confederation of Australian Industry Department of Defence Division of Applied Physics, CSIRO Fasteners Institute of Australia Federal Chamber of Automotive Industries Institute of Engineers, Austr

3、alia Institute of Production Engineers Metal Trades Industry Association of Australia Railways of Australia Committee Technical and Further Education Commission, N.S.W. Review of Australian Standards. To keep abreast of progress in industry, Australian Standards are subject to periodic review and ar

4、e kept up to date by the issue of amendments or new editions as necessary. It is important therefore that Standards users ensure that they are in possession of the latest edition, and any amendments thereto. Full details of all Australian Standards and related publications will be found in the Stand

5、ards Australia Catalogue of Publications; this information is supplemented each month by the magazine The Australian Standard, which subscribing members receive, and which gives details of new publications, new editions and amendments, and of withdrawn Standards. Suggestions for improvements to Aust

6、ralian Standards, addressed to the head office of Standards Australia, are welcomed. Notification of any inaccuracy or ambiguity found in an Australian Standard should be made without delay in order that the matter may be investigated and appropriate action taken. This Standard was issued in draft f

7、orm for comment as DR 91074. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 21 Jan 2008 AS 1722.21992 Australian Standard Pipe threads of Whitworth form Part 2: Fastening pipe threads First published as AS B1541958 (endorsement of BS 27791956 without amendment). Revised and redesignated AS 1722.21975.

8、 Second edition 1989. Third edition 1992. PUBLISHED BY STANDARDS AUSTRALIA (STANDARDS ASSOCIATION OF AUSTRALIA) 1 THE CRESCENT, HOMEBUSH, NSW 2140 ISBN 0 7262 7162 4 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 21 Jan 2008 AS 1722.219922 PREFACE This Standard was prepared by the Standards Australia

9、Committee on Screw Threads to supersede AS 1722.21989. This Standard is technically equivalent to ISO 228/1, Pipe threads where pressure-tight joints are not made on the threads, Part 1: Designation, dimensions and tolerances, and ISO 228/2, Pipe threads where pressure-tight joints are not made on t

10、he threads, Part 2: Verification by means of limit gauges. The 1989 edition which was based on the ISO 228/1 and 228/2documentscontained certain gauging/tolerance errors and omissions which could result in improper assessment of threads geometric qualities and was withdrawn. No changes to basic dime

11、nsions in the 1992 edition have been made with regard to the 1975 edition. Components made to the current edition are functionally identical and interchangeable with components made to 1975 edition. Gauges manufactured to comply with the limits specified in AS 1722.21975 were intended to check the s

12、ame basic dimensions as those listed in AS 1722.2 1992 and may therefore continue to be used until they become worn beyond the permitted limits. The principal differences between this edition and the 1975 edition are as follows: (a)The design features of screw gauges are now explained. (b)Modified t

13、ables of dimensions for fastening pipe threads. (c)Modified tables for screw gauge limits. (d)Figures for thread profiles of GO ring gauges and their check plugs, relative positions of pitch diameter tolerance zones for NOT GO ring gauges and their check plugs, are now included. (e)GO gauges now hav

14、e wear allowance. (f)Symbols now align with ISO practice. (g)Provision for the use of roller type screw calliper gauges which are currently used in Australian practice. (h)Setting plugs for GO and NOT GO screw calliper gauges are included. CopyrightSTANDARDS AUSTRALIA Users of Standards are reminded

15、 that copyright subsists in all Standards Australia publications and software. Except where the Copyright Act allows and except where provided for below no publications or software produced by Standards Australia may be reproduced, stored in a retrieval system in any form or transmitted by any means

16、 without prior permission in writing from Standards Australia. Permission may be conditional on an appropriate royalty payment. Requests for permission and information on commercial software royalties should be directed to the head office of Standards Australia. Standards Australia will permit up to

17、 10 percent of the technical content pages of a Standard to be copied for use exclusively in-house by purchasers of the Standard without payment of a royalty or advice to Standards Australia. Standards Australia will also permit the inclusion of its copyright material in computer software programs f

18、or no royalty payment provided such programs are used exclusively in-house by the creators of the programs. Care should be taken to ensure that material used is from the current edition of the Standard and that it is updated whenever the Standard is amended or revised. The number and date of the Sta

19、ndard should therefore be clearly identified. The use of material in print form or in computer software programs to be used commercially, with or without payment, or in commercial contracts is subject to the payment of a royalty. This policy may be varied by Standards Australia at any time. Accessed

20、 by UNIVERSITY OF SOUTH AUSTRALIA on 21 Jan 2008 3AS 1722.21992 CONTENTS Page SECTION 1 SCOPE AND GENERAL 1.1SCOPE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 1.2REFERENCED DOCUMENTS . . . . . . . . . . . . . . . . . . . . . . . .

21、 . . . . . . . . . . . . . . . . .4 1.3DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 1.4SYMBOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 1.5CLASSIFICATION . .

22、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 1.6DESIGNATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 SECTION 2 THREAD PROFILES AND DIMENSIONS 2.1PROFILE OF THREAD . . . . . . . . . . . . .

23、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 2.2DIMENSIONS AND TOLERANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 SECTION 3 GAUGES AND GAUGING PRACTICE 3.1SCOPE OF SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

24、. . . . . . . . . . .8 3.2TYPES OF GAUGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 3.3GENERAL CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 3.4GAUGES FOR EXTERNAL THREADS AND THEIR CHECK PLUGS . . .

25、. . . . . . . . .8 3.5GAUGES FOR INTERNAL THREADS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 3.6DESIGN FEATURES OF SCREW GAUGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 APPENDIX A SCREW GAUGE LIMITS . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26、. . . . . . . . . .21 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 21 Jan 2008 AS 1722.219924 STANDARDS AUSTRALIA Australian Standard Pipe threads of Whitworth form Part 2: Fastening pipe threads SECTION 1 SCOPE AND GENERAL 1.1 SCOPE This Standard specifies thread form, thread dimensions, tolerance,

27、 and associated gauges and gauging practices for threads used for fastening pipes. The Standard covers pipe threads for pipe of nominal bore size 4 mm to 150 mm. NOTES: 1Where these threads are used on pipes for conveying fluids, the sealing is effected by means other than thread interference (e.g.

28、gaskets on flanges or O-rings). 2Pipe threads of Whitworth form where pressure tight joints are made on the threads are specified in AS 1722.1. 1.2 REFERENCED DOCUMENTS The following Standards are referred to in this Standard: AS 1098Roller-type screw calliper gauges 1722Pipe threads of Whitworth fo

29、rm 1722.1Part 1: Sealing pipe threads 3501Parallel screw threads of Whitworth form (BSW and BSF) and associated gauges and gauging practice 3528Cylindrical screw threadsVocabulary B129Designs for geometric limit gauges (plain and screwed in inch units) 1.3 DEFINITIONS For the purpose of this Standar

30、d, the definitions given in AS 3528 apply. 1.4 SYMBOLS The symbols used in this Standard are listed below. SymbolTerm b3width of clearance groove at the major and minor diameter, respectively, of the thread profile with truncated flanks Dbasic major diameter of the internal thread (= d) D1basic mino

31、r diameter of the internal thread (= D 1.280 654P = d1) D1,maxmaximum minor diameter of internal thread D1,minminimum minor diameter of internal thread D2basic pitch diameter of the internal thread (= D 0.640 327P = d2) dbasic major diameter of the external thread dmaxmaximum major diameter of exter

32、nal thread dminminimum major diameter of external thread d1basic minor diameter of the external thread (= d 1.280 654P = D1) d2basic pitch diameter of the external thread (= d 0.640 327P = D2) Hheight of the triangle of the thread profile hheight of the thread profile with rounded crests and roots m

33、distance between the middle of the tolerance zone (TR) of the threaded ring gauge and the middle of the tolerance zone (TCP) of the GO check plug Ppitch Rradius of rounded crests and roots Stolerance for b3 sdisplacement of the clearance groove with truncated flanks COPYRIGHT Accessed by UNIVERSITY

34、OF SOUTH AUSTRALIA on 21 Jan 2008 5AS 1722.21992 SymbolTerm TCPtolerance for the pitch diameter of GO and NOT GO threaded check plugs and wear check plugs TD,1tolerance for the minor diameter of the internal thread TD,2tolerance for the pitch diameter of the internal thread Tdtolerance for the major

35、 diameter of the external thread Td,2tolerance for the pitch diameter of the external thread TPLtolerance for the pitch diameter of GO and NOT GO threaded plug gauges TRtolerance for the pitch diameter of GO and NOT GO threaded ring gauges utwice the radial height of rounding at crest and root of th

36、read (= 0.147 84P) WGOaverage amount available for the permissible wear of GO threaded plug gauge and GO threaded ring gauge WNGaverage amount available for the permissible wear of NOT GO threaded plug gauge and NOT GO threaded ring gauge ZPLdistance between the middle of the tolerance zone (TPL) of

37、 the GO threaded plug gauge and the lower limit of the thread ZRdistance between the middle of the tolerance zone (TR) of the GO threaded plug gauge and the lower limit of the thread 1.5 CLASSIFICATION For internal threads, one class of tolerance entirely positive is provided. For external threads,

38、two classes of tolerance on the pitch diameter are provided, as follows: (a)Class A tolerance: entirely negative of equal numerical value to that provided for the internal thread tolerance (see Table 2.1). (b)Class B tolerance: entirely negative of value twice that of the Class A tolerance (see Tabl

39、e 2.1). NOTES: 1Where no tolerance class is stated, Class B is assumed. 2The tolerance zones are shown in Figure 2.2. 3The choice of fit for a particular purpose rests with the purchasers designer. 1.6 DESIGNATION Internal and external threads shall be designated by the letter G followed by the thre

40、ad size designation given in Table 2.1, and, for external threads, the tolerance class. For example, G1/2for an internal thread, G1/2A for a Class A external thread, and G1/2B for a Class B external thread. NOTE: Where no tolerance class is stated for an external thread, Class B is assumed. COPYRIGH

41、T Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 21 Jan 2008 AS 1722.219926 SECTION 2 THREAD PROFILES AND DIMENSIONS 2.1 PROFILE OF THREAD The basic profile of the thread shall be the basic Whitworth form as shown in Figure 2.1. This form is identical with that specified for the parallel thread in AS

42、1722.1. The internal and external threads covered by this Standard are both parallel. The crests of the threads may be truncated to the limits of tolerance as given in Figure 2.2. 2.2 DIMENSIONS AND TOLERANCES 2.2.1 Dimensions The basic dimensions for the threads shall be as given in Table 2.1. 2.2.

43、2 Limiting dimension The limiting dimensions for major, pitch, and minor diameter shall be as given in Table 2.1. The pitch diameter tolerances are intended to include the diametral effect of pitch and angle errors. TABLE 2.1 DIMENSIONS FOR FASTENING PIPE THREADS 12345678910111213141516 Designa- tio

44、n of threads Number of threads in 25.4 mm Pitch (P) Basicdiameter, mmLimits for external threaddiameters, mm Limits for internal thread diameters, mm Major (d = D) Pitch (d2= D2) Minor (d1= D1) Major diameter (Classes A andB) Pitchdiameter PitchdiameterMinor diameter Class Min.Max. AB Min.Max.Min.Ma

45、x. Min.Max.Min.Max. G1/16 G1/8 G1/4 28 28 19 0.907 0.907 1.337 7.723 9.728 13.157 7.142 9.147 12.301 6.561 8.566 11.445 7.509 9.514 12.907 7.723 9.728 13.157 7.035 9.040 12.176 7.142 9.147 12.301 6.928 8.933 12.051 7.142 9.147 12.301 7.142 9.147 12.301 7.249 9.254 12.426 6.561 8.566 11.445 6.843 8.8

46、48 11.890 G3/8 G1/2 G5/8 19 14 14 1.337 1.814 1.814 16.662 20.955 22.911 15.806 19.793 21.749 14.950 18.632 20.588 16.412 20.671 22.627 16.662 20.955 22.911 15.681 19.651 21.607 15.806 19.793 21.749 15.556 19.509 21.465 15.806 19.793 21.749 15.806 19.793 21.749 15.931 19.935 21.891 14.950 18.632 20.

47、588 15.395 19.173 21.129 G3/4 G7/8 G1.0 14 14 11 1.814 1.814 2.309 26.441 30.201 33.249 25.279 29.039 31.770 24.118 27.878 30.292 26.157 29.917 32.889 26.441 30.201 33.249 25.137 28.897 31.590 25.279 29.039 31.770 24.995 28.755 31.410 25.279 29.039 31.770 25.279 29.039 31.770 25.421 29.181 31.950 24

48、.118 27.878 30.292 24.659 28.419 30.932 G1 1/8 G1 1/4 G1 1/2 11 11 11 2.309 2.309 2.309 37.897 41.910 47.803 36.418 40.431 46.324 34.940 38.953 44.846 37.537 41.550 47.443 37.897 41.910 47.803 36.238 40.251 46.144 36.418 40.431 46.324 36.058 40.071 45.964 36.418 40.431 46.324 36.418 40.431 46.324 36

49、.598 40.611 46.504 34.940 38.953 44.846 35.580 39.593 45.486 G1 3/4 G2.0 G2 1/4 11 11 11 2.309 2.309 2.309 53.746 59.614 65.710 52.267 58.135 64.231 50.789 56.657 62.753 53.386 59.254 65.276 53.746 59.614 65.710 52.087 57.955 64.014 52.267 58.135 64.231 51.907 57.775 63.797 52.267 58.135 64.231 52.267 58.135 64.231 52.447 58.315 64.448 50.789 56.657 62.753 51.429 57.297 63.393 G2 1/2 G2 3/4 G3.0 11 11 11 2.309 2.309 2.309 75.184 81.534 87.884 73.705 80.055 86.405 72.227 78.577 84.927 74.750 81.100 87.450 75.184 81.534 87.884 73.488 79.838 86.188 73.705 80.055 86.