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, 0.725 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Set of 10

ARP Washer, Hardened, High Performance, Flat, 3/8 in. ID, 0.725 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Set of 10

$9.00

ARP Washer, Hardened, High Performance, Chamfer, Flat, 5/16 in. ID, 0.655 in. OD, 0.075 Thick, Stainless Steel, Polished, Each

ARP Washer, Hardened, High Performance, Chamfer, Flat, 5/16 in. ID, 0.655 in. OD, 0.075 Thick, Stainless Steel, Polished, Each

$2.10

ARP Washer, Hardened, High Performance, Chamfer, Flat, 10mm ID, 19.1mm OD, 3mm Thick, Chromoly, Black Oxide, Each

ARP Washer, Hardened, High Performance, Chamfer, Flat, 10mm ID, 19.1mm OD, 3mm Thick, Chromoly, Black Oxide, Each

$2.49

Trick Flow Head Bolt Washers, Steel, Black Oxide, .450 in. to .813 in, .115 in. Thick, Set of 20

Trick Flow Head Bolt Washers, Steel, Black Oxide, .450 in. to .813 in, .115 in. Thick, Set of 20

$35.24

ARP Washer, Hardened, High Performance, Chamfer, Flat, 3/8 in. ID, 1.200 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Set of 10

ARP Washer, Hardened, High Performance, Chamfer, Flat, 3/8 in. ID, 1.200 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Set of 10

$35.07

ARP Washer, Hardened, High Performance, Flat, 8mm ID, 14.5mm OD, 1.6mm Thick, Chromoly, Black Oxide, Set of 10

ARP Washer, Hardened, High Performance, Flat, 8mm ID, 14.5mm OD, 1.6mm Thick, Chromoly, Black Oxide, Set of 10

$17.61