A washer is a thin plate with a hole in the middle that is used in tandem with a threaded fastener like a screw, bolt, or nut. The uses of washers can vary greatly, from helping distribute the load of a fastener to serving as a spacer, spring, wear pad, locking device, and to reduce vibration. The hole in the middle of the washer, known as the inner diameter, is usually half of the washer’s outer diameter, but this can vary greatly depending on the type of washer and its intended use.
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