Iso 2768 M H Verified May 2026

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

For class m, deviation = ±0.2 mm for nominal sizes 0.5–3 mm, and ±0.5 mm for >3–120 mm. 3.2 Geometrical Tolerances (Part 2 – Class "H") Class H is the fine category for geometrical features such as straightness, flatness, perpendicularity, symmetry, and runout. Table 2 lists permissible deviations for the relevant nominal size ranges of the feature’s longer dimension. iso 2768 m h

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. For features with a nominal size (width) up to 100 mm → 0

| 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 | and Industrial Implications For class m