BIS Certification For Steel roller chains Type S and C, Attachments and chain wheels BIS has developed IS 2637:2004 for Steel Roller Chains (Type S & C), their Attachments and Chain Wheels. This specification provides the requirements and directions for the design and construction of roller chains for industry, including standard, heavy, and multiple strand. Also covered in this standard are the staking out of the above roller chain types for different modes of operation and a method for calculating chain length. Meeting this benchmark helps manufacturers ensure that their products perform according to specific standards and maintain proper safety protections. Steel roller chains and chain wheels producers would now have to get BIS (Bureau of Indian Standards) standardization to sell their product to the vicinity of the Indian market. This certification confirms that the chains and chain wheels meet the requisite quality and dimensions as prescribed under BIS. Also, all ISI Certified products must have the ISI Mark printed on them which shall ensure the product’s quality, safety and trust.