A roller chain is provided with the links having extending butt portions to prevent excess inward movement of the chain. The butts may be located on the inner links or outer links. A silent chain with block lacing is also provided with the butt portions on the guide links.

A roller chain is provided with links having some rollers of nylon. The nn rollers may be arranged with standard metallic rollers in patterns along the length of a single-strand or double strand roller chain. The nylon is polytetramethylene-adipamide.