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):
: It keeps technical drawings clean and easy to read.
| Dimension Range for Radii/Chamfer (mm) | Tolerance Class 'm' (mm) | | :--- | :--- | | 0.5 up to 3 | ±0.2 | | >3 up to 6 | ±0.5 | | >6 up to 30 | ±1.0 |
The standard is a globally recognized guideline used in mechanical engineering to simplify technical drawings by defining general tolerances for linear and angular dimensions. When a drawing specifies "ISO 2768-mh" in its title block, it establishes a default level of precision for every feature that doesn't have a specific, individual tolerance applied to it. Breaking Down "mH"