ISO2768 tolerance standard
In daily engineering drawings, many users like to quote, such as “unmarked tolerance according to ISO2768-m”, so what standard is ISO2768?
Thousands of words are summarized in the following table:
| Limit dimensions for length and angle dimensions | ||||
| According to ISO 2768-1 | ||||
| Nominal size | Tolerance dimension | |||
| Range | f (Fine) | m (Intermediate) | c (Crude) | v (Extremely thick) |
| mm | Tolerance mm | Tolerance mm | Tolerance mm | Tolerance mm |
| 0.5-3 | ± 0.05 | ± 0.10 | ± 0.15 | – |
| 3- 6 | ± 0.05 | ± 0.10 | ± 0.20 | ± 0.50 |
| 6- 30 | ± 0.10 | ± 0.20 | ± 0.50 | ± 1.00 |
| 30- 120 | ± 0.15 | ± 0.30 | ± 0.80 | ± 1.50 |
| 120- 400 | ± 0.20 | ± 0.50 | ± 1.20 | ± 2.50 |
| 400- 1000 | ± 0.30 | ± 0.80 | ± 2.00 | ± 4.00 |
| 1000- 2000 | ± 0.50 | ± 1.20 | ± 3.00 | ± 6.00 |
| 2000- 4000 | – | ± 2.00 | ± 4.00 | ± 8.00 |
| Limit dimension of angular dimension | ||||
| According to ISO 2768-1 | ||||
| Nominal size | Tolerance dimension | |||
| Range | f (Fine) | m (Intermediate) | c (Crude) | v (Extremely thick) |
| mm | Tolerance mm | Tolerance mm | Tolerance mm | Tolerance mm |
| <10 | ± 10′ | ±1°30′ | ± 3° | |
| 10- 50 | ± 30′ | ± 1° | ± 2° | |
| 50- 120 | ± 20′ | ± 30′ | ± 1° | |
| 120- 400 | ± 10′ | ± 15′ | ± 30′ | |
| Above 400 | ± 5′ | ± 10′ | ± 20′ | |
| Limit dimensions of bending radius (radian) and inclined plane height (inclined angle) | ||||
| According to ISO 2768-1 | ||||
| Nominal size | Tolerance dimension | |||
| Range | f (Fine) | m (Intermediate) | c (Crude) | v (Extremely thick) |
| mm | Tolerance mm | Tolerance mm | Tolerance mm | Tolerance mm |
| 0.5-3 | ± 0.20 | ± 0.40 | ||
| >3-6 | ± 0.50 | ± 1.00 | ||
| >6 | ± 1.00 | ± 2.00 | ||
