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The ARP 3/8" ID, 5/8" OD black washer is a compact engine hardware washer sized for 3/8-inch shafts to provide consistent outer diameter and spacing in assemblies. Use these washers where precise clearance and repeatable seating are required during maintenance or component replacement. They serve as reliable spacers in engine fastener setups without altering core fastener geometry.
ARP 3/8 ID 5/8 OD black washers
