One joint equipment couplings are also employed to join two nominally coaxial shafts. In this application the system is named a equipment-sort flexible, or flexible coupling. The solitary joint makes it possible for for small misalignments these kinds of as installation glitches and changes in shaft alignment thanks to running situations. These sorts of equipment couplings are usually limited to angular misalignments of 1/4–1/2°.

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

Equipment couplings and common joints are used in equivalent apps. Gear couplings have higher torque densities than common joints made to fit a offered space even though common joints induce reduced vibrations. The restrict on torque density in common joints is because of to the constrained cross sections of the cross and yoke. The equipment teeth in a equipment coupling have large backlash to let for angular misalignment. The surplus backlash can add to vibration.

Every single joint consists of a one:1 equipment ratio interior/external gear pair. The tooth flanks and outer diameter of the external equipment are crowned to allow for angular displacement among the two gears. Mechanically, the gears are equivalent to rotating splines with modified profiles. They are referred to as gears since of the comparatively massive dimensions of the teeth.

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