A type of fastener, washers are thin disk-shaped plates with a hole in the center, used in conjunction with a threaded fastener such as a screw or bolt. Washers distribute load, create separation, prevent corrosion and wear, lock fasteners into place, and reduce vibrations. Washers are typically made from metal or plastic, although rubber and fiber are used as well in limited applications. Washers vary in size, but typically have an outer diameter roughly twice that of the inner diameter.
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