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The ARP 5/16-inch washer is a machined fastening washer with a 5/16" inner diameter and .550" outer diameter, sold as a 2-pack. It provides a consistent bearing surface for bolts and helps distribute clamp load in assembly and repair work. These washers are a simple, direct replacement for hardware where that sizing is required during engine or general mechanical projects.
ARP 5/16 ID .550 OD Washer - 2 Pack
