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, 0.750 in. OD, Chromoly, Black Oxide, 0.09 in. Thick, Set of 2

ARP Washer, Hardened, High Performance, Flat, 3/8 in. ID, 0.750 in. OD, Chromoly, Black Oxide, 0.09 in. Thick, Set of 2

$4.52

ARP Washer, Hardened, High Performance, Chamfer, Flat, 12mm ID, 22.2mm OD, 3mm Thick, Chromoly, Black Oxide, Set of 2

ARP Washer, Hardened, High Performance, Chamfer, Flat, 12mm ID, 22.2mm OD, 3mm Thick, Chromoly, Black Oxide, Set of 2

$4.94

ARP Washer, Hardened, High Performance, Flat, 3/8 in. ID, 0.875 in. OD, Chromoly, Black Oxide, O.D. Chamfer, 0.015 in. Thick, Set of 10

ARP Washer, Hardened, High Performance, Flat, 3/8 in. ID, 0.875 in. OD, Chromoly, Black Oxide, O.D. Chamfer, 0.015 in. Thick, Set of 10

$26.88

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, Flat, 7/6 in. ID, 0.750 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Set of 10

ARP Washer, Hardened, High Performance, Flat, 7/6 in. ID, 0.750 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Set of 10

$18.66