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, 3/8 in. ID, 0.655 in. OD, Stainless Steel, Polished, 0.09 in. Thick, Set of 10

ARP Washer, Hardened, High Performance, Flat, 3/8 in. ID, 0.655 in. OD, Stainless Steel, Polished, 0.09 in. Thick, Set of 10

$17.64

ARP Washer, Hardened, High Performance, Chamfer, Flat, 18mm ID, 73.7mm OD, 9.9mm Thick, Chromoly, Black Oxide, Each

ARP Washer, Hardened, High Performance, Chamfer, Flat, 18mm ID, 73.7mm OD, 9.9mm Thick, Chromoly, Black Oxide, Each

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ARP Washer, Hardened, High Performance, Flat, 7/6 in. ID, 0.875 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Set of 10

ARP Washer, Hardened, High Performance, Flat, 7/6 in. ID, 0.875 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Set of 10

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ARP Washer, Hardened, High Performance, Flat, 3/8 in. ID, 0.750 in. OD, Chromoly, Black Oxide, 0.09 in. Thick, Set of 10

ARP Washer, Hardened, High Performance, Flat, 3/8 in. ID, 0.750 in. OD, Chromoly, Black Oxide, 0.09 in. Thick, Set of 10

$17.76

ARP Washer, Hardened, High Performance, Flat, 3/8 in. ID, 0.725 in. OD, Stainless Steel, Polished, 0.09 in. Thick, Set of 10

ARP Washer, Hardened, High Performance, Flat, 3/8 in. ID, 0.725 in. OD, Stainless Steel, Polished, 0.09 in. Thick, Set of 10

$17.64