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South Coast Fasteners keeps the 5/16" Flat Washers (USS), Medium Carbon Through Hardened Steel, Plain, Import (Dims: 3/8" I.D. x 7/8" O.D.) in stock and ready to ship. It is made from Medium Carbon Through Hardened Steel with a plain finish. Built for spreading the clamp load and protecting the work surface, it is part of our Thru Hardened USS Flat Washers line, stocked across industries such as Automotive and HVAC.
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