Solitary joint equipment couplings are also used to link two nominally coaxial shafts. In this application the device is named a equipment-variety adaptable, or flexible coupling. The one joint permits for slight misalignments this kind of as set up problems and alterations in shaft alignment thanks to functioning problems. These kinds of equipment couplings are usually limited to angular misalignments of one/4–1/2°.

Gear couplings are typically constrained to angular misalignments, i.e., the angle of the spindle relative to the axes of the related shafts, of 4–5°. Universal joints are capable of larger misalignments.

Gear couplings and common joints are employed in comparable applications. Equipment couplings have higher torque densities than universal joints created to match a provided area whilst common joints induce reduced vibrations. The restrict on torque density in common joints is thanks to the minimal cross sections of the cross and yoke. The gear enamel in a gear coupling have higher backlash to allow for angular misalignment. The extra backlash can lead to vibration.

Every single joint is composed of a 1:one equipment ratio interior/external gear pair. The tooth flanks and outer diameter of the external gear are topped to let for angular displacement amongst the two gears. Mechanically, the gears are equivalent to rotating splines with modified profiles. They are called gears because of the comparatively large size of the tooth.

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