Calculators
General tolerances ISO 2768-1
Find general tolerances for linear dimensions, angles and chamfers, classes f m c v.
When it applies
ISO 2768-1 sets general tolerances for dimensions that have no tolerance written beside them on the drawing. The drawing names the class in the title block, such as ISO 2768-m or ISO 2768-mK. The first letter is the ISO 2768-1 class used on this page; the second is the ISO 2768-2 class for general geometrical tolerances.
The tolerance of an angle is set by the length of its shorter leg, because a short leg lets the angle wander more. Sizes under 0.5 mm have no general tolerance: a tolerance must always be written beside them.
General tolerances do not apply to dimensions in a box (basic dimensions, TED), reference dimensions in brackets, or dimensions that already carry a tolerance.