One joint equipment couplings are also utilised to connect two nominally coaxial shafts. In this application the unit is named a gear-kind flexible, or versatile coupling. The one joint allows for small misalignments such as installation glitches and adjustments in shaft alignment because of to working problems. These kinds of gear couplings are typically restricted 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 linked shafts, of 4–5°. Common joints are capable of larger misalignments.

Equipment couplings and common joints are utilized in equivalent programs. Equipment couplings have increased torque densities than common joints made to fit a provided area while common joints induce decrease vibrations. The limit on torque density in common joints is thanks to the limited cross sections of the cross and yoke. The gear enamel in a equipment coupling have large backlash to permit for angular misalignment. The excessive backlash can lead to vibration.

Each joint is made up of a 1:one equipment ratio internal/external equipment pair. The tooth flanks and outer diameter of the exterior gear are crowned to let for angular displacement amongst the two gears. Mechanically, the gears are equal to rotating splines with modified profiles. They are known as gears simply because of the fairly large dimension of the teeth.

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