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Key (engineering)
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, couplings, and washers.
==Types==
There are three main types of keys: ''Sunk'', ''Saddle'', and ''Tangent'', ''Round'', and ''Spline'' keys.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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