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A washer is a thin plate (typically disk-shaped) with a hole (typically in the middle) that is normally used to distribute the load of a threaded fastener, such as a screw or nut.
Lock washers are installed by putting a bolt or screw through the center of the washer, so that the washer is beneath the bolt or screw head or between the nut and the surface being fastened. Lock washers are used to keep screws and bolts from loosening, especially as a result of vibration or changes in temperature.