BS ISO 21342:2019

This standard BS ISO 21342:2019 Synchronous belt drives. Automotive belts and pulleys is classified in these ICS categories:

• 43.060.10 Engine block and internal components
• 21.220.10 Belt drives and their components

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.