BZP PENNY WASHERS M6 x 40mm OJ188096

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.