Jaw Coupling is a type of servo coupling that is designed to transmit torque , while damping system vibrations by connecting two shafts . This way the other components are prevented from any damage . These couplings has three parts , two metalic hubs and an element , that is an elastomer, also known as ‘spider’ . The jaw coupling is designed in such a way that it can tolerate high RPM. The use of jaw coupling helps in shock absorption