A jaw coupling is a kind 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 even now hottest elastomer couplings in the world because of their inherent simplicity. Two identical 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 for example pumps, supporters, blowers and compressors.
Jaw Couplings need no lubrication and offer high reliability for light to medium duty applications with great alignment of equipment and no requirement for torsional dampening.
In normal operating conditions there is absolutely no metal to metallic contact so the life of the hubs is virtually indefinite. Nevertheless, in a catastrophic failure of the element the load would be carried by the hubs providing a amount of failure safety. Jaw couplings are resistant to essential oil, dirt, wetness and grease.
Specific element materials are available to achieve maximum 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 component options. It has a temp operating range suitable for most commercial applications and permits up to at least one 1 degree misalignment capability of the 
linked shafts. NBR is the most economically costed option.