ISO 5294-2012 pdf download.Synchronous belt drives – Pulleys. ISO 5294 specifies the principal characteristics of synchronous pulleys for use in synchronous endless belt drives for mechanical power transmission and where positive indexing or synchronization is required. NOTE These drives have been known under various names in the past. for example: timing belt drives. positive belt drives, gear belt drives. The principal characteristics include: a) tooth dimensions and tolerances; b) pulley dimensions and tolerances; c) quality specification. As far as dimensions are concerned, the pulleys specified in this International Standard are used interchangeably with the belts specified in ISO 5296. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 254, Belt drives — Pulleys — Quality,finish and balance ISO 1101. Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form. orientation, location and run-out ISO 5296, Synchronous belt drives — Belts with pitch codes MXL, XXL, XL, L, H, XH and XXH — Metric and inch dimensions 3 Tooth dimensions 3.1 Involute teeth 3.1.1 The involute tooth profile results in different…