ISO2768-1 公差标准

STANDARD ISO 2768–1

General tolerances for linear

and angular dimensions.

Extract from the standard

04-09-2001 www.exapoint.se Table 1 - Permissible deviations for linear dimensions except for broken edges (external

radii and chamfer heights)

Tolerance class Permissible deviations for basic size range

Designation Description from

0,5*

up to

3

over

3

up to

6

over

6

up to

30

over

30

up to

120

over

120

up to

400

over

400

up to

1000

over

1000

up to

2000

over

2000

up to

4000

f fine ± 0,05± 0,05± 0,1 ± 0,15± 0,2 ± 0,3 ± 0,5 --

m medium ± 0,1 ± 0,1 ± 0,2 ± 0,3 ± 0,5 ± 0,8 ± 1,2 ± 2

c coarse ± 0,2 ± 0,3 ± 0,5 ± 0,8 ± 1,2 ± 2 ± 3 ± 4

v very coarse -- ± 0,5 ± 1 ± 1,5 ± 2,5 ± 4 ± 6 ± 8 * For nominal size below 0,5 mm, the deviation shall be indicated adjacent to the

relevant nominal size(s).

Table 2 – Permissible deviations for broken edges (external radii and chamfer heights) Tolerance class Permissible deviations for basic size range

Designation Description from 0,5* up to 3 over 3 up to 6 over 6

f fine

m medium

± 0,2 ± 0,5 ± 1

c coarse

v very

coarse

± 0,4 ± 1 ± 2

* For nominal size below 0,5 mm, the deviation shall be indicated adjacent to the

relevant nominal size(s).

Table 3 – Permissible deviations for angular dimensions

Tolerance class Permissible deviations for ranges of lengths in millimetres of

shorter side of the angle concerned

Designation Description up to 10 over 10

up to 50

over 50

up to 120

over 120

up to 400

over 400

f fine

m medium

± 1o ± 0,5o ± 0,333o ± 0,166o ± 0,083o

c coarse ± 1,5o ± 1o ± 0,5o ± 0,25o ± 0,166o

v very coarse ± 3o ± 2o ± 1o ± 0,5o ± 0,333o Indication on drawing – example (medium): ISO 2768-m alternatively SS-ISO 2768-1 m