Iso 2768-m Tolerances May 2026

| Nominal Size Range (mm) | Permissible Deviation (mm) for Class m | |------------------------|------------------------------------------| | 0.5 up to 3 | ±0.1 | | >3 up to 6 | ±0.1 | | >6 up to 30 | ±0.2 | | >30 up to 120 | ±0.3 | | >120 up to 400 | ±0.5 | | >400 up to 1000 | ±0.8 | | >1000 up to 2000 | ±1.2 | | >2000 up to 4000 | ±2.0 | Example: A shaft of length 75 mm (without individual tolerance) under ISO 2768-m allows a deviation of (actual length: 74.7 mm to 75.3 mm). 4. Angular Dimension Tolerances (ISO 2768-1, Class m) Angular tolerances are specified by deviation per unit length , independent of the nominal angle value.

1. Introduction ISO 2768 is an international standard for general tolerances. It applies to linear and angular dimensions without individual tolerance indications on technical drawings. iso 2768-m tolerances

| Nominal Length of Shorter Side (mm) | Permissible Deviation (Class m) | |--------------------------------------|----------------------------------| | Up to 10 | ±1° | | >10 up to 50 | ±0°30’ (0.5°) | | >50 up to 120 | ±0°20’ (0.333°) | | >120 up to 400 | ±0°10’ (0.166°) | | >400 | ±0°5’ (0.083°) | Example: An angle of 45° with a shorter leg length of 80 mm allows a tolerance of (44°40’ to 45°20’). 5. Radii and Chamfer Tolerances (ISO 2768-1, Class m) | Nominal Size Range (mm) | Permissible Deviation (mm) for Class m | |------------------------|------------------------------------------| | 0.5 up to 3 | ±0.2 | | >3 up to 6 | ±0.5 | | >6 up to 30 | ±1.0 | | >30 up to 120 | ±2.0 | | >120 up to 400 | ±4.0 | Note: For chamfer lengths, the same linear tolerances apply as in Section 3. 6. Geometrical Tolerances (ISO 2768-2, Class m) For features without individual geometrical tolerances, the following general geometrical tolerances apply (class m): | Nominal Size Range (mm) | Permissible Deviation