BIS Certification For Cranked-link mill chains or welded construction, attachments and sprockets BIS Certification in Respect of Cranked-Link Mill Chains of Welded Construction, Attachments and Sprockets. BIS has devloped in IS 13927:2005, which is also for cranked-link mill chains of welded construction, including their attachments and sprockets. The purpose of this standard is to establish the maintenance of durability, reliability, and effectiveness of chains available for use in industrial application and rotating machines. Through adhering to IS 13927:2005, manufacturers also ensure that their products satisfy the stipulated criteria on strength, performance and safety. Cranked link mill chains & sprockets shall hereafter, get BIS certification, wherever such chains and sprockets shall be marketed in India. This certification means chains and sprockets meet the quality standards established by BIS. Moreover, they must all bear the ISI Mark, signifying conformity to an accepted criteria and reliability in use.