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Stainless steel flat washers are used to increase the surface area of fasteners, in order to evenly distribute the force applied when tightening them to a surface. They are also used to prevent loosening due to vibration, to stop the bolt or screw from pulling through, and act as spacers. They are manufactured from 18-8 stainless steel and are covered by the ASME B18.21.1 standard.
Dottie® FWS12 Flat Washer, 1/2 in Trade, 0.526 to 0.546 x 1.055 to 1.092 in Dia, 18-8 Stainless Steel