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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.
Same values as flatness for the shorter side.
| 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 |
