A jaw coupling is a type of general purpose power transmission coupling that also can be utilized in movement control (servo) applications. It really is designed to transmit torque (by linking two shafts) while damping program vibrations and accommodating misalignment, which protects other elements from damage.
Jaw Couplings are among the first and still hottest elastomer couplings in the world because of their inherent simplicity. Two similar hubs with 3 face lugs are connected through a superstar shaped element, sometimes referred to as an insert or spider. The 3 piece style makes them simple to work with and popular 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 no requirement of torsional dampening.
In normal operating conditions there is absolutely no metal to metallic contact therefore the life of the hubs is practically indefinite. However, in a catastrophic failure of the component the load would still be carried by the hubs providing a degree of failure safety. Jaw couplings are resistant to essential oil, dirt, moisture and grease.
Specific element materials are available to achieve maximum performance for the operating conditions.
The standard element materials is NBR (N)-‘Synthetic 
Rubber’. It really is highly flexible, essential oil resistant and the torsionally softest of the element options. It includes a heat operating range ideal for most industrial applications and permits up to 1 1 degree misalignment capability of the connected shafts. NBR may be the most economically costed option.