ARP insert washers are designed to protect the top of the bolt holes from galling or collapsing around studs or bolts. They are fully CNC-machined from premium through-hardened 8740 stock.

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ARP Washer, Hardened, High Performance, Flat, 5/16 in. ID, 0.812 in. OD, 0.120 Thick, Chromoly, Black Oxide, Each

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