M5 X 20MM - 1.50 PENNY/REPAIR WASHER (ZINC)

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Used with threaded fasteners (for example a bolt and a nut), designed to increase the load distribution.

Mudguard (penny) washers have an extra large outer diameter.
Typically used to spread the tightening load over a greater area than a conventional flat washer.
Bright Zinc Plate (BZP) finish offers resistance to corrosion.