These Forgefix Form B Flat Washers are Zinc Plated for increased resistance to corrosion. Washers provide a smooth surface for the nut or bolt to bear on, making it less likely to loosen as a result of an uneven fastening surface. The main purpose of a washer is to distribute the load under a bolt head or the nut face. Application: On all manner of bolting applications. Can be used with all types of bolts & nuts. Zinc coatings prevent oxidation of the protected metal to create a longer