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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.
Some washers have a ratcheting surface to fix the nut in a particular orientation. Some washers are thick in order to re-distribute the contact pressure and soften the damage to the clamped body. Some washers are there to separate dissimilar metals to avoid galvanic corrosion.