This International Standard specifies the characteristics of cranked-link1) drag chains of welded construction suitable for conveying bulk materials, together with associated attachments and chain sprockets. The chain dimensions specified in this International Standard ensure interchangeability of both complete chains and individual links for repair purposes. This International Standard is applicable to sprockets with between 5 and 20 teeth. Specifications are also given for five types of attachment for use with the conveyor chains conforming to this International Standard.