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.