A jaw coupling is a kind of general purpose power transmission coupling that also can be utilized in motion control (servo) applications. It is made to transmit torque (by linking 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 similar hubs with 3 encounter lugs are linked through a celebrity shaped element, sometimes referred to as an insert or spider. The 3 piece design makes them simple to work with and popular on applications such as pumps, followers, blowers and compressors.

Jaw Couplings require no lubrication and provide 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 metal contact so the life of the hubs is virtually indefinite. However, in a catastrophic failing of the component the load would be carried by the hubs offering a degree of failure protection. Jaw couplings are resistant to oil, dirt, wetness and grease.

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

The standard element materials is NBR (N)-‘Synthetic Rubber’. It really is highly flexible, oil resistant and the torsionally softest of the component options. It has a temperature operating range ideal for most industrial applications and allows for up to at least one 1 degree misalignment capacity of the connected shafts. NBR may be the most economically costed option.