An element used to connect a rotating machine element to a shaft.

Keyway shown in a gear, a similar keyway would be cut into the shaft

The shaft and the gear would then be locked together using a small rectangular key.

The three parts that form this system must fit together with a very tight tolerance to avoid any chattering and wear that will eventually lead to a failure of the joint.

See also: Axle, Morse Taper, Woodruff Cutter.

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Subjects: Mechanical Engineering