Solitary joint gear couplings are also used to link two nominally coaxial shafts. In this software the gadget is called a gear-kind versatile, or versatile coupling. The one joint enables for minimal misalignments this sort of as set up mistakes and alterations in shaft alignment owing to working situations. These sorts of equipment couplings are typically restricted to angular misalignments of 1/4–1/2°.

Gear couplings are typically restricted 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 higher misalignments.

Gear couplings and common joints are used in comparable applications. Gear couplings have higher torque densities than universal joints developed to in shape a offered room even though common joints induce decrease vibrations. The limit on torque density in universal joints is owing to the minimal cross sections of the cross and yoke. The equipment tooth in a gear coupling have large backlash to let for angular misalignment. The surplus backlash can lead to vibration.

Each joint is made up of a 1:1 equipment ratio inside/external equipment pair. The tooth flanks and outer diameter of the exterior equipment are crowned to enable for angular displacement amongst 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 fairly big dimensions of the tooth.

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