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The ARP washer kit supplies precision washers that spread fastener clamp load and protect mating surfaces. These washers feature a 5/16" inner diameter and a 0.625" outer diameter with a black finish and a flat seating profile. They are intended for use beneath bolts or nuts where a tidy appearance, consistent seating, and reliable load distribution are required.
ARP 5/16 ID .625 OD black washers
