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.

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

| 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 |

Same values as flatness for the shorter side.

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.