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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 steel and zinc-plated and are manufactured to ASME B18.21.1 standard.
Dottie® FW58 Flat Washer, 5/8 in Trade, 0.681 to 0.718 in ID x 1.743 to 1.78 in OD Dia, Carbon Steel, Zinc-Plated