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.

| 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): iso 2768-m tolerances

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. | Nominal Size Range (mm) | Permissible Deviation