This International Standard specifies dimensions, tolerances, measuring forces and minimum tensile strengths, together with the tooth gap forms and rim profiles of the associated chain wheels, for cranked-link or offset sidebar roller chains suitable for the mechanical transmission of power and allied applications under onerous conditions. The dimensions of chains specified ensure complete interchangeability of any given size and provide interchangeability of individual links of the chain for repair purposes. NOTE 1 Since these chains have been derived from an "inch" series of chains, their original dimensions are given in annex B.