Coupling, also known as a coupling joint, is a mechanical component used to firmly connect the driving and driven shafts of different mechanisms for simultaneous rotation, while transmitting motion and torque. It is also sometimes used to connect shafts to other parts (such as gears, pulleys, etc.). Typically composed of two halves, which are connected using keys or tight fits and secured at the ends of the shafts, then joined together in some manner. The coupling can compensate for misalignments between the shafts due to manufacturing and installation inaccuracies, deformation during operation, or thermal expansion (including axial, radial, angular, or composite misalignments); as well as mitigate impacts and absorb vibrations.

Common couplings are generally standardized or specified. Typically, it's just a matter of correctly selecting the type of coupling, determining the model and size. In case of necessity, load capacity checks can be performed on the vulnerable parts. At high rotational speeds, calculations for centrifugal force on the outer edge and deformation of elastic elements are required, along with balance checks.

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