ISO 6971:2002 specifies the characteristics of cranked-link drag chains of welded construction suitable for conveying bulk materials, together with associated attachments and chain sprockets. The chain dimensions specified in ISO 6971:2002 ensure interchangeability of both complete chains and individual links for repair purposes.

ISO 6971:2002 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 ISO 6971:2002.