For geometry (ISO 2768-2), common classes are (H = finest, L = coarsest). Class k sits in the middle.
The ISO 2768-mk standard is widely used in various industries, including:
Place this in the title block or general notes section of your drawing:
If you see a drawing note stating "General tolerances ISO 2768-mk" , the manufacturer must follow specific tolerance classes without cluttering the drawing with individual ± values for every hole, slot, or edge.
The ISO 2768 standard is a widely adopted international standard that defines the general tolerances for linear and angular dimensions, as well as the geometrical tolerances for machined parts. The standard provides a framework for specifying and verifying the dimensional and geometrical accuracy of parts.
Understanding ISO 2768-MK: General Tolerances for Metallic Linear and Angular Dimensions