Couplings are devices which are mainly used to transmit rotational energy (namely rotational torque, rotational movements) from a shaft to another shaft. Couplings are divided to rigid and flexible types. In rigid couplings such as shell coupling, oscillations are low in the transmitted torque, and the introduced product is a rigid coupling. These kinds of couplings have no wearing, they don’t require maintenance and they can be used in both rotational direction. Rotational torque pulses and vibrations are transmitted without damping. This type of coupling provides shaft to shaft connection or shaft to flange connection through friction of conical surfaces on each other.