In the world of technical drawing and mechanical engineering, specifying every single dimension with a unique tolerance is impractical, time-consuming, and clutters the blueprint. This is where come into play. Among the most widely recognized standards globally is ISO 2768 , and within that standard, the specific class "mk" represents a critical balance between manufacturing cost and precision.
For Class K, the general tolerance for is fixed at 0.2 mm . general tolerance iso 2768-mk
This class provides permissible deviations based on the nominal size of the dimension. Nominal Length Range (mm) Tolerance (± mm) over 3 to 6 over 6 to 30 over 30 to 120 over 120 to 400 over 400 to 1000 over 1000 to 2000 over 2000 to 4000 ISO 2768-1 Tolerance Chart ISO 2768-2: Geometrical Tolerances (Class K) In the world of technical drawing and mechanical
| 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 | For Class K, the general tolerance for is fixed at 0