A jaw coupling is a kind of general purpose power transmission coupling that also can be used in motion control (servo) applications. It really is made to transmit torque (by connecting two shafts) while damping program vibrations and accommodating misalignment, which protects other components from damage.
Jaw Couplings are one of the first and even now hottest elastomer couplings in the world due to 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 require no lubrication and offer high reliability for light to moderate duty applications with good alignment of equipment and no requirement for torsional dampening.

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

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

The standard element materials is NBR (N)-‘Synthetic Rubber’. It is highly flexible, oil resistant and the torsionally softest of the element options. It has a temperatures operating range suitable for most commercial applications and permits up to 1 1 degree misalignment capacity of the linked shafts. NBR is the most economically priced option.