The title block of all engineering drawings shall contain the following note:
"GENERAL TOLERANCES: ISO 2768-mk"
ISO 2768-mk is the go-to default for general machined parts in most workshops. It balances cost, inspectability, and functionality. Always verify that your feature tolerances (especially form) are adequate for assembly – if not, add explicit GD&T. general tolerance iso 2768-mk
Need to check a specific dimension? Use the tables above or refer to the official ISO 2768-1:1989 and ISO 2768-2:1989 standards. The title block of all engineering drawings shall
Applicable to external radii, chamfer heights, and linear sizes (lengths, widths, diameters). "GENERAL TOLERANCES: ISO 2768-mk"
| Nominal Size Range (mm) | Permissible Deviation (mm) | | :--- | :--- | | 0.5 up to 3 | ±0.1 | | >3 up to 6 | ±0.1 | | >6 up to 30 | ±0.2 | | >30 up to 120 | ±0.3 | | >120 up to 400 | ±0.5 | | >400 up to 1000 | ±0.8 | | >1000 up to 2000 | ±1.2 |
Note: For nominal sizes <0.5 mm, individual tolerances must be specified.