General Tolerance Iso 2768-mk ((link)) -

| Nominal Dimension Range (mm) | Tolerance (mm) | | --- | --- | | 0.5 to 3 | ±0.2 | | >3 to 6 | ±0.5 | | >6 to 30 | ±1.0 |

Refers to ISO 2768-2 . This uppercase letter defines the permissible deviations for geometrical features (form and position), such as flatness, straightness, and perpendicularity. general tolerance iso 2768-mk

Simplified linear tolerance table (mm):

Using ISO 2768-mk tells the manufacturer: "Unless a specific tolerance is written on a dimension, assume the 'medium' class for size and the 'medium' class for geometry." | Nominal Dimension Range (mm) | Tolerance (mm)