General | Tolerance Iso 2768-mk

Understanding ISO 2768-mk: The Standard for General Geometrical and Linear Tolerances

Ensures features are centered correctly (e.g., 0.6 mm for lengths up to 300 mm).

Functionality. 'cL' is too loose for sliding fits, rotating shafts, or aligned mounting holes. 'mk' ensures basic interchangeability. general tolerance iso 2768-mk

| Nominal Length Range (mm) | Permissible Deviation ('K' Class, mm) | | :--- | :--- | | up to 10 | 0.05 | | over 10 up to 30 | 0.10 | | over 30 up to 100 | 0.20 | | over 100 up to 300 | 0.40 | | over 300 up to 1000 | 0.60 | | over 1000 up to 3000 | 0.80 |

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: 'mk' ensures basic interchangeability

Symmetry tolerances apply to elements that share a central axis or plane. Nominal Length Range (mm) Permissible Deviation (mm) for Class Over 100 to 300 Over 300 to 1000 Over 1000 to 3000 Circular Run-Out

Note: For nominal sizes below 0.5 mm, the deviation must be indicated adjacent to the size on the drawing. Nominal Length Range (mm) Permissible Deviation (mm) for

The of your components (plastics, aluminum, steel)? If your parts involve mating assemblies with tight fits? Share public link

For parallelism , the tolerance equals the value of the size tolerance. For positional tolerances , the standard recommends using ISO 2768-2 only for "non-functional" features; otherwise, individually specify.