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 connecting two shafts) while damping system vibrations and accommodating misalignment, which protects other parts from damage.
Jaw Couplings are among the first and still hottest elastomer couplings in the world because of their inherent simplicity. Two identical hubs with 3 face lugs are linked through a superstar shaped element, sometimes known as an insert or spider. The 3 piece design makes them simple to work with and popular on applications such as pumps, supporters, blowers and compressors.

Jaw Couplings need no lubrication and offer high dependability for light to moderate duty applications with great alignment of equipment and no requirement of torsional dampening.

In normal operating conditions there is no metal to metal contact so the life of the hubs is virtually indefinite. Nevertheless, in a catastrophic failure of the element the load would still be carried by the hubs providing a degree of failure protection. Jaw couplings are resistant to essential oil, dirt, moisture and grease.

Specific element materials can be found to achieve maximum performance for the functioning conditions.

The standard element material is NBR (N)-‘Synthetic Rubber’. It is highly flexible, essential oil resistant and the torsionally softest of the component 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 is the most economically priced option.