TIEN YUEN MACHINERY MFG. CO., LTDDOUBLE PITCH ROLLER .
TYC offers ANSI / ISO doublepitch roller chains and attachments. These chains are made with high precision and advanced production processes to ensure supreme quality. DOUBLE PITCH ROLLER CHAIN. TYC produces two types of doublepitch roller chains, the transmission type and the conveyor type. The transmission type has "figureeight" shaped side plates. The .