Chain couplings are three-piece flexible shaft couplings that are used to connect driving and driven shafts in mechanical power transmission assemblies. Flexible shaft couplings are used to counter the inevitable misalignment that occurs between connected shafts. Chain couplings are utilized to transmit power between two shafts.

Generally, chain couplings will be installed off the end of a motor or reducer (gearbox) and utilized to connect to a machine for efficient power transmission. The main benefit of using a chain coupling is its ability to transmit high levels of torque, making it ideal for the highest torque applications. Chain couplings have flanges that are linked with duplex roller chains, giving them a high level of strength.