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, Chamfer, Flat, 5/16 in. ID, 0.675 in. OD, 0.120 Thick, Chromoly, Black Oxide, Set of 2

ARP Washer, Hardened, High Performance, Chamfer, Flat, 5/16 in. ID, 0.675 in. OD, 0.120 Thick, Chromoly, Black Oxide, Set of 2

$4.69

ARP Washer, Hardened, High Performance, Flat, 1/2 in. ID, 1.350 in. OD, Chromoly, Black Oxide, 0.245 in. Thick, Each

ARP Washer, Hardened, High Performance, Flat, 1/2 in. ID, 1.350 in. OD, Chromoly, Black Oxide, 0.245 in. Thick, Each

$14.73

ARP Washer, Hardened, High Performance, Chamfer, Flat, 12mm ID, 22.2mm OD, 2.3mm Thick, Chromoly, Black Oxide, Each

ARP Washer, Hardened, High Performance, Chamfer, Flat, 12mm ID, 22.2mm OD, 2.3mm Thick, Chromoly, Black Oxide, Each

$2.49

ARP Washer, Hardened, High Performance, Flat, 9mm ID, 20.6mm OD, 3mm Thick, Chromoly, Black Oxide, Each

ARP Washer, Hardened, High Performance, Flat, 9mm ID, 20.6mm OD, 3mm Thick, Chromoly, Black Oxide, Each

$3.22

ARP Washer, Hardened, High Performance, Chamfer, Flat, 1/2 in. ID, 0.875 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Set of 2

ARP Washer, Hardened, High Performance, Chamfer, Flat, 1/2 in. ID, 0.875 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Set of 2

$4.80

ARP Washer, Hardened, High Performance, Flat, 7/6 in. ID, 0.812 in. OD, Stainless Steel, Polished, 0.12 in. Thick, Each

ARP Washer, Hardened, High Performance, Flat, 7/6 in. ID, 0.812 in. OD, Stainless Steel, Polished, 0.12 in. Thick, Each

$3.05