Coupling

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This article describes a mechanical connection between two things. For other meanings, see Coupling (disambiguation).

Rotating coupling

A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. Unlike a clutch, couplings do not allow connection or disconnection of shafts during operation.

There are two main types of couplings:

Rigid couplings are used when precise shaft alignment is required; shaft misalignment will affect the coupling's performance as well as its life.
Flexible couplings are designed to transmit torque while permitting some radial and axial and angular misalignment. Flexible coupling can accommodate angular misalignment up to a few degrees and some parallel misalignment.