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, 6mm ID, 22.6mm OD, 4.2mm Thick, Chromoly, Black Oxide, Set of 10

ARP Washer, Hardened, High Performance, Flat, 6mm ID, 22.6mm OD, 4.2mm Thick, Chromoly, Black Oxide, Set of 10

$56.10

ARP Washer, Insert, Washer, Insert, 3/8 in. ID - .443 in. OD, Pair

ARP Washer, Insert, Washer, Insert, 3/8 in. ID - .443 in. OD, Pair

$17.34

ARP Washer, Hardened, High Performance, Chamfer, Flat, 7/6 in. ID, 0.705 in. OD, Chromoly, Black Oxide, 0.09 in. Thick, Set of 10

ARP Washer, Hardened, High Performance, Chamfer, Flat, 7/6 in. ID, 0.705 in. OD, Chromoly, Black Oxide, 0.09 in. Thick, Set of 10

$18.00

ARP Washer, Hardened, High Performance, Flat, 3/8 in. ID, 0.715 in. OD, Stainless Steel, Polished, 0.12 in. Thick, Each

ARP Washer, Hardened, High Performance, Flat, 3/8 in. ID, 0.715 in. OD, Stainless Steel, Polished, 0.12 in. Thick, Each

$3.05

ARP Washer, Insert, Washer, Insert, Chromoly, Black Oxide, .500 in. I.D, .567 in. O.D, Pair

ARP Washer, Insert, Washer, Insert, Chromoly, Black Oxide, .500 in. I.D, .567 in. O.D, Pair

$18.24