Iso 2768 M H _best_ May 2026

For features with a nominal size (width) up to 100 mm → 0.2 mm; up to 300 mm → 0.3 mm; up to 1000 mm → 0.5 mm.

Same values as flatness for the shorter side. iso 2768 m h

| Nominal Length Range (mm) | Straightness / Flatness (mm) – H | |---------------------------|----------------------------------| | Up to 10 | 0.02 | | >10 to 30 | 0.05 | | >30 to 100 | 0.1 | | >100 to 300 | 0.2 | | >300 to 1000 | 0.3 | | >1000 to 3000 | 0.4 | For features with a nominal size (width) up to 100 mm → 0

General Tolerances for Linear and Angular Dimensions According to ISO 2768-mH: Interpretation, Application, and Industrial Implications iso 2768 m h

| Nominal Size Range (mm) | Permissible Deviation (mm) – 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 |

For class m, the deviation is ±0.5° or ±30 minutes for nominal lengths ≤120 mm, and ±0°20' per 100 mm length for larger features.