ISO 1977:2006 specifies the characteristics of bush, plain and flanged roller chains of both solid and hollow bearing pin types designed for general conveying and mechanical handling duties, together with associated chain sprockets and attachments. The chain dimensions it specifies will ensure interchangeability of complete chains and individual links for repair purposes. It is applicable to sprockets with from 6 to 40 teeth. Control criteria for sprockets are defined to ensure correct meshing, operation and transmission of load in use under normal operating conditions. Specifications are also given for K attachments and deep plates for use with the conformant conveyor chains.