The designation indicates a specific combination of general tolerances for a technical drawing. The first lowercase letter ( m ) refers to "medium" tolerances for linear and angular dimensions (Part 1), while the second uppercase letter ( H ) refers to the highest precision class for geometrical features (Part 2). Understanding ISO 2768-mh
Thus, (often written as mh ) means:
The designation ISO 2768-mh defines a standard set of general tolerances for engineering drawings that lack individual tolerance specifications. It is divided into two parts: Part 1 (m): (m) tolerance for linear and angular dimensions. Part 2 (h): iso 2768-mh tolerance chart
For more information on the ISO 2768-MH tolerance chart, you can refer to the following resources: ISO 2768-mh The designation indicates a specific combination
The callout is a common engineering standard that sets "medium" general tolerances for a part's size and geometry. Instead of labeling every single dimension with a plus-minus value, adding "ISO 2768-mH" to your drawing's title block establishes a global default for all untoleranced features. It is divided into two parts: Part 1
Tolerances in mm for nominal size ranges. Applies to external radii, chamfers, and linear dimensions (except broken edges).