image = Keys.scad.png |designers = [[User:Tim|Timothy Schmidt]] |date = 2021 |vitamins = |materials = |transformations = |lifecycles = |tools = [[Saws]], [[CNC Mills]] |parts = |techniques = |files = |suppliers = |git =

Parts Motion parts

=Introduction= In mechanical engineering, a key is a machine element used to connect a rotating machine element to a shaft. The key prevents relative rotation between the two parts and may enable torque transmission. For a key to function, the shaft and rotating machine element must have a keyway and a keyseat, which is a slot and pocket in which the key fits. The whole system is called a keyed joint. A keyed joint may allow relative axial movement between the parts.

Commonly keyed components include gears, pulleys, shaft couplers, and washers.

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=References=

• Key (engineering)
• 1/4" square key