ISO 21342:2019

This document specifies the characteristics of synchronous endless belts and their related pulleys for use in automotive applications such as engine camshaft drives.
The characteristics include:
-  belt pitch spacing;
-  belt nominal tooth dimensions;
-  belt width and width tolerance;
-  belt pitch length and pitch length tolerance;
-  pulley groove dimensions and tolerances;
-  pulley tolerances and quality specifications.
Test methods for measuring belt pitch length and lateral runout are also included.