Here is a conceptual breakdown of what you will find inside the : 1. Linear Dimensions Table (mm) The table cross-references nominal size ranges (e.g., 0.5–3 mm, 3–6 mm, up to 4000 mm) against the three tolerance classes: Fine (f), Medium (m), and Coarse (c).
| Tolerance Class | Permissible Deviation (mm per 100mm length) | | :--- | :--- | | Fine (f) | ± 0.3 mm/m | | Medium (m) | ± 0.5 mm/m | | Coarse (c) | ± 1.0 mm/m |
Using the "Medium" class for a 45mm part, the linear tolerance is ± 0.8 mm. This means your part can be 44.2 mm to 45.8 mm.
| Nominal Size Range (mm) | Fine (f) Tolerance (± mm) | Medium (m) Tolerance (± mm) | Coarse (c) Tolerance (± mm) | | :--- | :--- | :--- | :--- | | 0.5 up to 3 | 0.05 | 0.1 | 0.2 | | 3 up to 6 | 0.1 | 0.2 | 0.5 | | 6 up to 30 | 0.2 | 0.5 | 1.0 | | 30 up to 120 | 0.3 | 0.8 | 1.5 | | 120 up to 400 | 0.5 | 1.2 | 2.5 | | 400 up to 1000 | 0.8 | 2.0 | 4.0 | | 1000 up to 2000 | 1.2 | 3.0 | 6.0 | | 2000 up to 4000 | 2.0 | 5.0 | 10.0 |