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ISO 2768-mh tolerance chart is a standardized system used in mechanical engineering to simplify technical drawings by defining general tolerances for linear and geometrical dimensions without specific indications. The designation "mH" refers to a combination of two specific precision classes: (Medium) for linear and angular dimensions and for geometrical tolerances (form and position). Overview of ISO 2768
The designation is split into two distinct parts that cover different aspects of a part's geometry: m (Medium): ISO 2768-1 , which defines general tolerances for linear and angular dimensions . It is the most common class for standard machining. ISO 2768-2 , which covers geometrical tolerances like straightness, flatness, and perpendicularity. The Linear Tolerance Chart (m) For a drawing labeled ISO 2768-m
6 — 30: ±0.2
Broken edges: Unless specified, external broken edges (chamfers/radii) follow linear tolerance class m: ±0.1 to ±2.0 depending on size.
Conclusion
Typical approach:
| Nominal Dimension (mm) | Flatness & Straightness | Perpendicularity | Symmetry | | :--- | :--- | :--- | :--- | | Up to 10 | 0.2 | 0.4 | 0.6 | | Over 10 up to 30 | 0.3 | 0.6 | 1.0 | | Over 30 up to 100 | 0.4 | 0.8 | 1.5 | | Over 100 up to 300 | 0.6 | 1.0 | 2.0 | iso 2768-mh tolerance chart
The "h" class defines the general tolerances for geometric characteristics. Straightness and Flatness: Up to 10 mm: 0.1 mm 10 to 30 mm: 0.2 mm 30 to 100 mm: 0.4 mm 100 to 300 mm: 0.8 mm 300 to 1000 mm: 1.2 mm
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