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The goal is simple: to simplify drawings. By referencing ISO 2768, a designer tells the machinist, "Unless I specify otherwise, follow these standard accuracy levels." Breaking Down the "mk" Suffix
If a specific feature requires higher precision than the general 'mK' level, the designer must explicitly label that individual dimension with its own tolerance. Summary of Benefits Cleaner Drawings: Reduces visual clutter by removing common tolerance ranges. Standardization: general tolerance iso 2768-mk
ISO 2768 is an international standard published by the International Organization for Standardization (ISO) that specifies general tolerances for linear and angular dimensions. The standard provides a framework for defining tolerances for parts and components that do not have specific tolerance requirements mentioned elsewhere, such as in the engineering drawings or in other relevant standards. The goal is simple: to simplify drawings
| Nominal Size Range (mm) | Flatness / Straightness (mm) | Perpendicularity (mm) | Symmetry (mm) | Circular Runout (mm) | | :--- | :--- | :--- | :--- | :--- | | 0.5 to 10 | 0.05 | 0.1 | 0.5 | 0.1 | | >10 to 30 | 0.1 | 0.2 | 0.5 | 0.1 | | >30 to 100 | 0.1 | 0.3 | 0.5 | 0.1 | | >100 to 300 | 0.2 | 0.4 | 0.5 | 0.1 | | >300 to 1000 | 0.3 | 0.5 | 0.5 | 0.1 | | >1000 to 3000 | 0.4 | 0.6 | 0.5 | 0.1 | The standard represents the "Medium" standard of modern
Angular tolerances are not constant; they depend on the length of the shorter side of the angle.
The standard represents the "Medium" standard of modern manufacturing. It balances manufacturing cost with functional reliability. By applying this standard, companies reduce drawing clutter, minimize misinterpretation, and ensure that parts are manufactured to a consistent, acceptable quality level.