2. ISO 2768-1: Angular Dimensions Tolerance Chart ("m" - Medium)

This article serves as a comprehensive guide to interpreting and applying the ISO 2768-mH standard, offering detailed charts for linear dimensions, angles, and geometrical tolerances. What is ISO 2768-mH? ISO 2768 is divided into two primary parts:

: On a technical drawing, you would write: ISO 2768-mH (or commonly ISO 2768-mh )

: Stands for Medium precision for linear and angular dimensions (Part 1).

For example, suppose we have a linear dimension with a nominal size of 100 mm. We want to apply a tolerance class M. According to the ISO 2768-MH tolerance chart, the tolerance value for a linear dimension with a nominal size between 80 mm and 120 mm is ±0.5 mm.

The designation is composed of two parts from the ISO 2768 standard: Standard Tolerances in Manufacturing: ISO 2768 & ISO 286

Note: Cylindricity tolerance is not specified in ISO 2768-2 .