Coupling chain is inside of roller chain coupling. Roller Chain couplings are capable of transmitting relatively high torques in a minimum of space. It is used to connect two shafts, a reducer, or a motor directly to a machine for efficient power transmissions. Construction is simple, it consist of a combination of only three basic parts ------ one coupling roller chain and two coupling sprockets. In the follow,we have listed the roller chain specification for the couplings.