If you are looking for customized and non-standard China supplier connection piece from one of the famous China connection piece manufacturers and factory, please feel free to contact CFSM.Material: 20#,16MnWeight: 3.335kgManufacture Process: Stamping + WeldingSurface treatment: black paintingDescription: A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. Couplings do not normally allow disconnection of shafts during operation, however there are torque limiting.