| Nominal Size Range | Permissible Deviation (± mm) | |--------------------|-------------------------------| | 0.5 – 3 | ±0.1 | | >3 – 6 | ±0.1 | | >6 – 30 | ±0.2 | | >30 – 120 | ±0.3 | | >120 – 400 | ±0.5 | | >400 – 1000 | ±0.8 | | >1000 – 2000 | ±1.2 |
| Tolerance Class (ISO 2768) | Part 1 (Linear) | Part 2 (Geometry) | Typical Use | | :--- | :--- | :--- | :--- | | | Tightest | Medium | Precision instruments | | m (Medium) | Standard | – | General machining (default) | | c (Coarse) | Loose | – | Fabrications, non-critical | | v (Very coarse) | Very loose | – | Castings before machining | general tolerance iso 2768-mk
For standard linear measurements like length or diameter, the permissible deviation increases as the part gets larger. Nominal Length Range (mm) Tolerance (± mm) 120 to 400 Source: Derived from General Tolerances ISO 2768-1 Geometrical Tolerances (ISO 2768-K) | Nominal Size Range | Permissible Deviation (±
By using ISO 2768-mk, the engineer saved 15 hours of detailing time per project and reduced machining quotes by 22% compared to over-toleranced drawings. general tolerance iso 2768-mk
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