Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=University of Alberta/5966844001, User=sharabiani, shahramfs Not for Resale, 05/02/2014 11 35 1[.]
INTERNATIONAl STANDARD ISO 2857-1973/AMENDMENT Published 1984-07-15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION• ME>K.QYHAPO,ll,HAR 0PfAHL-13AWL-1A no CTAHAAPH13AU~\o1· ORGANISATION INTERNATIONALE DE NORMALISATION Ground thread taps for ISO Metric threads of tolerance 4H to SH and 4G to 6G coarse and fine pitches Manufacturing tolerances on the threaded portion AMENDMENT Amendment to International Standard ISO 2857-1973 was developed by Technical Committee ISO lTC 29, Small tools, and was circulated to the member bodies in January 1983 It has been approved by the member bodies of the following countries: Australia Austria Belgium China Czechoslovakia Germany, F.R South Africa, Rep of Hungary India Italy Sweden Switzerland United Kingdom USSR Japan Poland Romania The member bodies of the following countries expressed disapproval of the document on technical grounds: ``,,,`,,``,,,,`,``,,``,```-`-`,,`,,`,`,,` - France USA UDC621.993 Ref No ISO 2857-1973/ A1-1984 (E) Descriptors: tools, cutting tools, taps, screw threads, dimensional tolerances @ International Organization for Standardization 1984 • Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS Licensee=University of Alberta/5966844001, User=sharabiani, shahramfs Not for Resale, 05/02/2014 11:35:13 MDT Price based on pages ISO 2857-1973/A1-1984 (EI page Delete clause 4.4 and substitute: 4.4 Tolerances on the half-angle a/2 of thread The values for tolerances on the half-angle a/2 are based on the pitch of the thread and shall be in accordance with the values of table Table - Tolerances on the half-angle a/2 Pitch ~~-~ ± 70' 0,3 0,35 0,4 ±50' 0,45 0,5 0,6 ± 35' 0,7 0,75 0,8 ± 30' 1,25 1,5 ± 25' 1,75 2,5 ± 20' 3,5 4,5 5,5 ± 15' - NOTE - For a g1ven p1tch, the half-angle tolerance a/2 has been calculated so that the equivalent error on the virtual pitch diameter does not exceed a stated proportion of the pitch diameter tolerance T02 for the corresponding class nut thread The stated proportion is B %, except for pitches finer than 0,4 mm where it is 10 % The calculated values have been rounded off to the nearest 5' to bring them within the scope of practical measurement , Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS Licensee=University of Alberta/5966844001, User=sharabiani, shahramfs Not for Resale, 05/02/2014 11:35:13 MDT ``,,,`,,``,,,,`,``,,``,```-`-`,,`,,`,`,,` - 0,2 0,25 Tolerance on a/2 ISO 2857-1973/ A 1-1984 I E) Page Clause Delete the line before the last in the left-hand column and substitute: "Tolerance on the half-angle of pitch la/2)" Pege9 Annex A In the table, replace the column "Tolerance on a and a/2" by the following: ~- Class of taps - Thread Designation M M M M M M M 1,1 1,2 1.4 1,6 1.8 -~ ~2.2 - M 2,5 M M 3,5 M M 4,5 M M M M M M 10 M 11 M 12 M 14 M 16 M 18 M20 M22 M 24 M27 M30 M33 M36 M39 M 42 M45 M48 d nominal Pitch p 1,1 0,25 1.2 1.4 1,6 0,3 1,8 2,2 2,5 3,5 -· -4,5 10 11 12 ·-· 14 16 18 20 27 30 33 36 39 42 45 48 52 ·· 60 nominal ± 70' 1' 1,2 - -~ 0,35 0.4 0.45 0,5 0,6 0,7 0,75 0,8 - ±50' - ± 35' - - ± 30' - - 1,25 - 1.4 1,6 f- 2,2 2,5 3,5 ·4 4,5 10 ± 25' - - 1,5 ~ - 1,75 12 14 16 18 - - - - - - 3,5 - 2,5 ± 20' - 3~ 36 39 42 45 48 52 56 60 - 4,5 - - - ± 15' - 5,5 r- - r- - 20 22 24 27 30 · - r :::: - - 64 68 1,8 ~ ~7 - - 56 d a/2 - -· 24 Toler on - 22 -, - M 52 M56 M60 M64 M68 _ 64 -=-·68 ``,,,`,,``,,,,`,``,,``,```-`-`,,`,,`,`,,` - Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS Licensee=University of Alberta/5966844001, User=sharabiani, shahramfs Not for Resale, 05/02/2014 11:35:13 MDT ISO 2857-1973/A1-1984 (E) Page 11 Annex In the table, replace the column "Tolerance on a and a/2" by the following: Class of taps - Thread Designation M M M M M M Pitch f d _ M M 2,2 X 0,25 X 0,25 X 0,35 f.""_ X 0,35 ~ 3,5 X 0,35 0.5 M 2,5 ``,,,`,,``,,,,`,``,,``,```-`-`,,`,,`,`,,` - M X p nominal M M 5,5 X X 0,5 0,5 M X 0,_75 M X 0,75 M M X X ~-10 X ± 70' ~-1~8 - 2,2 M 10 X X M 14 X M 14 X ~M 16 X X 0,35 ! X M 30 X f f - - - - f- - ± 50' - ± 35' ± 30' f f - 1,25 1,25 _ 1,25 1.5 -l~1,~5-+ 15 2 25 27 2B 30 32 5,5 f - - - - - - - - - - - - - - - - - - -12 ± 25' - ~,25_ f - - - - - - - - - - - - - - - - - - - - 14 1,5 f _ 1,5 - - 4,5 - 12 1,5 3,5 10 10 ~E- _x 1,5 M Z7 X M28 x1,5 M 28 X M 30 X 1.5 ~3() - - 0,75 ~_"_1,5 X f 5,5 16 M 17 X 1,5 1-:.:'-"- _.':_' "" J 17_ M 18 X 1,5 18 M 18 X M20 X 1,5 20 M20 X M22 X 1,5 22 M22 X - -M 24 X 1,5 24 M24 X M 25 2,2 - 2,5 - 2,5 3,5 ~2 x ~~ '1 1,2 1,4 1,6 - ~M :4'",5" -"x~._,o,C:5 l-_:::4,c:s~ o, M 12 d nominal a/2 0,2 1,1 X 0,2 - -'-_1,2 1,2 X 0,2 1,4 X 0,2 1,4 1,6 X 0,2 1,6 1,8 1,8 X 0,2 X Toler on - f -1,5 f - - - - - - - - - - - - - - - - - - - - - f - 14 15 16 17 - + 20' 1,5 1,5 + 25' + 20' ± 25' ± 20' ± 25' + 20' 25 ,2 - - ± 20' - - - ± 25' f -t2o· ~_5_-f - f2 1,5 20' ± 25' ~~f - 22 24 1,5 1,5 20 ± 25' -f - -j 18 27 28 ± 25' - ::t 20' ± 25' ± 20' 30 32 • Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS Licensee=University of Alberta/5966844001, User=sharabiani, shahramfs Not for Resale, 05/02/2014 11:35:13 MDT