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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
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