To legally and technically enforce ISO 2768 general tolerances, the drawing title block must include a specific note. The notation format combines the classes from Part 1 and Part 2. ISO 2768 - [Part 1 Class][Part 2 Class] Example: ISO 2768-mk

Table 1: Permissible Deviations for Linear Dimensions (Except Broken Edges) All values are in millimeters (mm). Tolerance Class over 3 to 6 over 6 to 30 over 30 to 120 over 120 to 400 over 400 to 1000 over 1000 to 2000 over 2000 to 4000 m (Medium) c (Coarse) v (Very Coarse)

The allowable deviation varies based on the size of the nominal dimension. Larger dimensions are naturally granted larger permissible variations. 1. Tolerances for Linear Dimensions (Except broken edges) Values are in millimeters (mm) Nominal Size Range (mm) Medium (m) Coarse (c) Very Coarse (v) 120 to 400 400 to 1000 1000 to 2000 2000 to 4000

Whether you keep a printed ISO 2768 general tolerances PDF at your workstation or bookmark an online calculator, having quick access to the tolerance tables saves time and prevents errors.

The Definitive Guide to ISO 2768 General Tolerances: Understanding, Applying, and Downloading the Standard