A jaw coupling is a type of general purpose power transmission coupling that also can be used in motion control applications. It is designed to transmit torque by connecting two shafts, while damping system vibrations and accommodating misalignment.   Jaw couplings are composed of three parts: two metallic hubs and an elastomer insert called an element.  The elastomeric insert as often called the “spider”. The three parts press fit together with a jaw from each hub fitted alternately with the lobes of the spider. Jaw coupling torque is transmitted through the elastomer lobes in compression.