INTERNATIONAl STANDARD ISO 2857-1973/AMENDMENT 1

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 1

Amendment 1 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 Hungary South Africa, Rep. of

Austria India Sweden
Belgium Italy Switzerland
China Japan United Kingdom
Czechoslovakia Poland USSR
Germany, F.R. Romania

The member bodies of the following countries expressed disapproval of the document on technical grounds:

France
USA
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UDC621.993 Ref. No. ISO 2857-1973/ A1-1984 (E)

Descriptors: tools, cutting tools, taps, screw threads, dimensional tolerances.

@ International Organization for Standardization. 1984 •

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 ISO 2857-1973/A1-1984 (EI

page 6

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 3.

Table 3 - Tolerances on the half-angle a/2

Pitch Tolerance on a/2

0,2
± 70'
0,25
~~-~ .. ------------
0,3
0,35 ±50'
0,4
--
0,45
0,5 ± 35'
0,6
0,7
0,75 ± 30'
0,8

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1
1,25 ± 25'
1,5
1,75
2
± 20'
2,5
3
-------
3,5
4
4,5
± 15'
5
5,5
6
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 5 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 .

.,
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 ISO 2857-1973/ A 1-1984 I E)

Page 7

Clause 6

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 _ Toler. on d
d Pitch a/2 nominal
Designation p
-
nominal
M 1 1 1
-
M 1,1 1,1... 0,25 ± 70' 1' 1
-
M 1,2 1.2 1,2
-~--

M 1.4 1.4 0,3 1.4

M 1,6 1,6 1,6
0,35 - - ±50'
M 1.8 1,8 f- 1,8
-----~
- --~
M 2 2 0.4
~2.2 2,2 2,2
0.45 - -
M 2,5 2,5 2,5
± 35'
M 3 3 0,5 3
-
M 3,5 3,5 0,6 3,5
-
·-
M 4 4 0,7 4
-·-- ---- -
M 4,5 4,5 0,75 ± 30' --4,5
-
M 5 5 0,8 5
-
M 6 6 6
1 - - ~-
M 7 7 7
-
M 8 8 8
1,25 - ± 25'
M 9 9 9
-
- M 10 10 10
1,5 - -
~--
M 11 11 ..
M 12 12 1,75 12
·-· -
M 14 14 14
M 16 16
2 - ..
16
-
M 18 18 18
- - ± 20'
M20 20 .
2,5 20
- - .
M22 22 22
-----· -
M 24 24 24
3 - -
M27 27 27
M30 30 30 · -
3,5 -- -
M33 33 1--3~
-
M36 36
-,--- M39 39
4 - -
36
-
39
M 42 42 42
4,5 - -
M45 45 45
M48
- ± 15'
48 48
5 - -
M 52 52 52
M56 56
-
r----::::---
56
M60 60
5,5 r- -
60
··-- -
M64 64 64
M68 68
6 r- - 1---=-·-
68

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3
 ISO 2857-1973/A1-1984 (E)

Page 11

Annex 8

In the table, replace the column "Tolerance on a and a/2" by the following:

Class of taps
-
Thread Toler. on d
-
________________ _ a/2 nominal
d Pitch f------ -
Designation p
nominal
M 1 X 0,21 1
M 1,1 X 0,2 1 1 '1
- ---'-_- -----
M 1,2 X 0,2 1,2 1,2
- ---
M 1,4 X 0,2 1,4 1,4
± 70'
M 1,6 X 0,2 1,6 1,6
M 1,8 X 0,2 1,8 ~-1~8
-
M 2 X 0,25 2 2
-
M 2,2 X 0,25 2,2 2,2
- ---
M 2,5 X 0,35 2,5 2,5
f-- -
f.""_ 3 X 0,35 3 0,35 ± 50' 3
~-- 3,5__ X 0,35 3,5 3,5
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M 4 X 0.5 4 ! 4
f--------------- -
4,5
~M...__:4'",5"---"x~._,o,C:5--l-_:::4,c:s~ o, 5
5
f - - - - __ - ± 35'
M 5 X 0,5 f- 5
-
M 5,5 X 0,5 5,5 5,5
M 6 X 0,_75 6 6
7 --- 0,75 ± 30'
M 7 X 0,75 7
M 8 X 1 8 8
f-------------------
M 9 X 1 9 9
f-------------------- - ----

~-10 X 1
10 10
M 10 X 1,25
1,25
f - - - - - - - - - - - - - - - - - - --
~2__ x __~~
12 - 12
M 12 X 1,5
_ -l~1,~5-+------------------------ - ± 25'
M 14 X 1,25
14 ~,25_ f - - - - - - - - - - - - - - - - - - - - - 14
M 14 X 1,5
___ f-------------- - -
1,5 15
~-
X
-- __15__ f--------------- - -
M 16 X 1.5 16
16__ 1,5 f - - - - - - - - - - - - - - - - - - - - - -
M 17 X 1,5 17
1-:.:'-"-___.':_'--""--J--17_ f--------------------- -
M 18 X 1,5
18 18
M 18 X 2 2 + 20'
-
M20 X 1,5 1,5 + 25'
20 20
M20 X 2 2 + 20'
M22 X 1,5 1,5 ± 25'
22 22
M22 X 2 2 ± 20'
. - --
M 24 X 1,5 ± 25'
24 -f-- - -- 24
M24 X 2 j 20'

~_"_1,5 1,5 ± 25'

25 25
M 25 X 2 ,2 + 20'
~E- _x 1,5 ± 25'
27 ~~f--------------------- ----- - 27
M Z7 X 2 2 ± 20'
-
M28 x1,5 1,5 1--- ± 25' 28
M 28 X 2
2B
2
-- -
-
f---t2o·
± 25'
M 30 X 1.5
~_5_-f------------------- -- f- ---
~3() X 2 30 2 30
- ::t 20'
M 30 X 3 3
---- -----
1,5 ± 25'
32 32
2 ± 20'

•
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Provided by IHS under license with ISO Licensee=University of Alberta/5966844001, User=sharabiani, shahramfs
No reproduction or networking permitted without license from IHS Not for Resale, 05/02/2014 11:35:13 MDT