Couplings, also known as couplings, are mechanical components used to firmly connect the driving and driven shafts of different mechanisms for simultaneous rotation, while transmitting motion and torque. They are also sometimes used to connect shafts to other parts (such as gears, pulleys, etc.). Typically, they are composed of two halves, connected by keys or tight fits, secured at both ends of the shafts, and then joined together in some manner. Couplings can compensate for misalignments between the two shafts due to inaccuracies in manufacturing and installation, deformation during operation, or thermal expansion (including axial, radial, angular, or composite misalignments); as well as mitigate shock and absorb vibration.

Common couplings are generally standardized or specified. Typically, it's just a matter of selecting the correct type of coupling, determining the model and size. In cases where necessary, load capacity calculations can be performed on the vulnerable weak points. When operating at high speeds, centrifugal forces on the outer edge and deformation of the elastic elements must be checked, as well as balance verification.

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