High Quality Content by WIKIPEDIA articles! In mechanical engineering, a key is a machine element used to connect a rotating machine element to a shaft. Through this connection the key prevents relative rotation between the two parts and allows torque to be transmitted through. For a key to function the shaft and rotating machine element must have a keyway, also known as a keyseat, which is a slot or pocket for the key to fit in. The whole system is called a keyed joint. A keyed joint still allows relative axial movement between the parts.

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