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Metal Steel Technology Summary>>ISO 2768-1 General tolerances for linear and angular dimensions. Extract from the standard
Table 1 - Permissible deviations for linear dimensions except for broken edges (external radii and chamfer heights) |
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Tolerance Class |
Permissible deviations for basic size range |
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0.5~3 |
>3~6 |
>6~30 |
>30~120 |
>120~400 |
>400~1000 |
>1000~3000 |
>2000~4000 |
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fine |
f |
±0.05 |
±0.05 |
±0.1 |
±0.15 |
±0.2 |
±0.3 |
±0.5 |
- |
medium |
m |
±0.1 |
±0.1 |
±0.2 |
±0.3 |
±0.5 |
±0.8 |
±1.2 |
±2 |
coarse |
c |
±0.2 |
±0.3 |
±0.5 |
±0.8 |
±1.2 |
±2 |
±3 |
±4 |
very coarse |
v |
- |
±0.5 |
±1 |
±1.5 |
±2.5 |
±4 |
±6 |
±8 |
Table 2 – Permissible deviations for broken edges (external radii and chamfer heights) |
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Tolerance Class |
P ermissible deviations for basic size range |
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0.5~3 |
>3~6 |
>6~30 |
>30 |
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fine |
f |
±0.2 |
±0.5 |
±1 |
±2 |
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medium |
m |
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coarse |
c |
±0.4 |
±1 |
±2 |
±4 |
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very coarse |
v |
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Table 3 – Permissible deviations for angular dimensions |
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Tolerance Class |
Permissible deviations for ranges of lengths in millimetres of shorter side of the angle concerned |
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~10 |
>10~50 |
>50~120 |
>120~400 |
>400 |
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fine |
f |
±1° |
±0.5° |
±0. 333 ° |
±0. 166 ° |
±0. 083 ° |
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medium |
m |
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coarse |
c |
±1.5° |
±1° |
±0.5° |
±0. 25 ° |
±0. 166 ° |
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very coarse |
v |
±3° |
±2° |
±1° |
±0. 5 ° |
±0.333° |
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