: Refers to Part 1 of the standard. It stands for the Medium tolerance class for linear and angular dimensions.

While useful, ISO 2768-mK has limitations that engineers must understand:

ISO 2768 is an international standard that defines general tolerances for linear, angular, and geometrical features on technical drawings. It applies to parts removed by metal cutting or formed from sheet metal.

For full technical charts, you can reference the ISO 2768-mK Overview or specialized guides from ZEISS Quality Forum .

However, it is crucial to remember that . If a specific dimension requires a tighter or looser tolerance than what ISO 2768-mK prescribes, that value must be explicitly stated next to the dimension. In such cases, the specific value overrides the general standard for that feature only.

When a drawing specifies ISO 2768-mK, the "m" (Medium) applies to the following dimension ranges. These values are approximate for illustration; always verify with the official standard.

It keeps drawings clean. Engineers only need to specify tolerances for critical dimensions (like bearing fits), while "mk" handles the rest.