Forgefix flat washer form b zp forgefix 100wash4 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 on all manner of bolting applications can be used with all types of bolts and nuts zinc coatings prevent oxidation of the pro