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MIDWEST FASTENER Flat Washer, 3/8 in ID, USS Grade, Stainless Steel, Package Quantity: 100.
A flat washer is a thin, usually round, plate with a hole in the middle that is normally used to distribute the load of a threaded fastener. USS flat washers have a large, wider body. SAE flat washers are machined to a tighter specification and have a smaller outside diameter.