arp washer, hardened, high performance, chamfer, flat, 5/16 in. id, 0.675 in. od, 0.120 thick, chromoly, black oxide, set of 10

Hardened ARP Special Purpose washers are parallel-ground from premium chromoly. They are available in a variety of sizes and thicknesses for use on virtually any application. Special connecting rod washers are available, as are some of the popular metric sizes. Build up your supply so you don't get caught short when the need arises.