is the international standard for general tolerances, designed to simplify engineering drawings by providing default permissible deviations for dimensions without individual tolerance callouts. Core Parts of the Standard The standard is divided into two distinct parts: Part 1 (ISO 2768-1): linear and angular dimensions , such as lengths, diameters, radii, and chamfers. Part 2 (ISO 2768-2): geometrical tolerances

How to Use the Tables

Part 1 specifies four tolerance classes. The designer selects one based on the functional requirements of the part.

Here is how to interpret it:

not

It applies when a designer does write a specific tolerance next to a dimension. Instead, the drawing notes "ISO 2768" or "General tolerances ISO 2768-mK" (or similar) in the title block.

| Nominal size (mm) | Tolerance (± mm) | |------------------|------------------| | 0.5 to 3 | 0.1 | | >3 to 6 | 0.1 | | >6 to 30 | 0.2 | | >30 to 120 | 0.3 | | >120 to 400 | 0.5 | | >400 to 1000 | 0.8 | | >1000 to 2000 | 1.2 |

Symmetry:

Regulates the alignment of two features relative to a center plane. How to use ISO 2768 in your Project