These apply to features (flatness, straightness, perpendicularity, symmetry, runout) .
What you plan to use (CNC machining, sheet metal, injection moulding?). The primary material of your component. general tolerance iso 2768-mk
For external radii and chamfer heights, the tolerances for class "m" are tighter to prevent sharp edges or excessive rounding: Nominal Dimension Range (mm) Permissible Deviation (mm) over 3 to 6 Permissible Deviations for Angular Dimensions For external radii and chamfer heights, the tolerances
For these critical features, individual tolerances must always be specified directly on the drawing. Why Use ISO 2768-mK in Engineering
For rotating components, circular run-out under Class K is set to a maximum deviation of , regardless of the feature size. 4. Why Use ISO 2768-mK in Engineering?
While ISO 2768-mK is a fantastic baseline, it is not a one-size-fits-all solution. You must explicitly state unique tolerances on your drawing when: