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The ARP 3/8" ID insert washer is a compact insert-style washer for 3/8-inch fasteners used in engine and mechanical assemblies. As an insert washer, it provides a snug fit around the shaft to stabilize fastener seating and maintain consistent spacing. Keep these on hand for rebuilds or repairs that call for precise, repeatable washer placement in tight tolerances.
ARP 3/8 ID insert washers
