Single joint gear couplings are also used to hook up two nominally coaxial shafts. In this software the system is called a gear-sort versatile, or flexible coupling. The single joint makes it possible for for minimal misalignments this kind of as installation errors and alterations in shaft alignment thanks to functioning situations. These sorts of equipment couplings are typically minimal to angular misalignments of 1/4–1/2°.

Gear couplings are normally restricted to angular misalignments, i.e., the angle of the spindle relative to the axes of the connected shafts, of 4–5°. Common joints are capable of larger misalignments.

Equipment couplings and universal joints are utilized in similar purposes. Equipment couplings have larger torque densities than universal joints created to suit a presented place although common joints induce reduce vibrations. The limit on torque density in common joints is thanks to the limited cross sections of the cross and yoke. The equipment teeth in a equipment coupling have high backlash to enable for angular misalignment. The excess backlash can lead to vibration.

Every joint consists of a 1:one equipment ratio inside/external gear pair. The tooth flanks and outer diameter of the external gear are crowned to let for angular displacement among the two gears. Mechanically, the gears are equal to rotating splines with modified profiles. They are known as gears due to the fact of the comparatively massive size of the teeth.

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