In general, Jaw Type Coupling is an all-purpose industrial power transmission system that can withstand angular misalignment and the associated reactionary loads, avoids contaminants, and has reasonable speed and dampening capability. A simple jaw coupling consists of three parts: two hubs bored to a clearance fit resistance, and an elastomeric insert. These inserts, also known as spiders, are intended to survive for a long time but must inevitably be replaced. These couplings are also lubricated-free. Unlike gear or chain couplings, which must be greased on a regular basis, a jaw coupling can continue to function as long as the insert is intact.