A jaw coupling is a type of general purpose power transmission coupling that also can be utilized in motion control (servo) applications. It really is designed to transmit torque (by linking two shafts) while damping program vibrations and accommodating misalignment, which protects other parts from damage.
Jaw Couplings are one of the first and even now hottest elastomer couplings in the globe because of their inherent simplicity. Two identical hubs with 3 face lugs are connected through a celebrity shaped element, sometimes referred to as an put in or spider. The 3 piece design makes them simple to work with and well-known on applications such as pumps, fans, 
blowers and compressors.
Jaw Couplings require no lubrication and offer high dependability for light to moderate duty applications with good alignment of equipment and no requirement for torsional dampening.
In regular operating conditions there is absolutely no metal to metallic contact so the life of the hubs is virtually indefinite. However, in a catastrophic failure of the component the load would be carried by the hubs offering a degree of failure protection. Jaw couplings are resistant to oil, dirt, dampness and grease.
Specific element materials can be found to achieve optimum performance for the operating conditions.
The standard element material is NBR (N)-‘Synthetic Rubber’. It really is highly flexible, oil resistant and the torsionally softest of the element options. It has a heat range operating range suitable for most industrial applications and permits up to 1 1 degree misalignment capacity of the linked shafts. NBR may be the most economically costed option.