A jaw coupling is a kind of general purpose power transmission coupling that also can be used in motion control (servo) applications. It is designed to transmit torque (by connecting two shafts) while damping system vibrations and accommodating misalignment, which protects other elements from damage.
Jaw Couplings are among the first and still hottest elastomer couplings in the globe due to their inherent simplicity. Two similar hubs with 3 face lugs are linked through a star shaped element, sometimes known as an insert or spider. The 3 piece design makes them simple to work with and well-known on applications such as pumps, enthusiasts, blowers and compressors.

Jaw Couplings need no lubrication and provide high reliability for light to medium 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 virtually indefinite. However, in a catastrophic failure of the element the load would be carried by the hubs providing a degree of failure protection. Jaw couplings are resistant to oil, dirt, wetness and grease.

Specific element materials are available to achieve optimum performance for the working conditions.

The standard spider jaw couplingselement material is NBR (N)-‘Synthetic Rubber’. It is highly flexible, essential oil resistant and the torsionally softest of the component options. It includes a temperature 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.