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, 0.550 in. OD, 0.095 Thick, Chromoly, Black Oxide, Set of 2

ARP Washer, Hardened, High Performance, Chamfer, Flat, 5/16 in. ID, 0.550 in. OD, 0.095 Thick, Chromoly, Black Oxide, Set of 2

$4.69

ARP Washer, Hardened, High Performance, Chamfer, Flat, 5/16 in. ID, 0.625 in. OD, 0.120 Thick, Stainless Steel, Polished, Set of 2

ARP Washer, Hardened, High Performance, Chamfer, Flat, 5/16 in. ID, 0.625 in. OD, 0.120 Thick, Stainless Steel, Polished, Set of 2

$6.45

ARP Washer, Hardened, High Performance, Flat, 5/16 in. ID, 0.812 in. OD, 0.120 Thick, Chromoly, Black Oxide, Set of 10

ARP Washer, Hardened, High Performance, Flat, 5/16 in. ID, 0.812 in. OD, 0.120 Thick, Chromoly, Black Oxide, Set of 10

$18.66

ARP Washer, Hardened, High Performance, Flat, 1/2 in. ID, 1.300 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Set of 2

ARP Washer, Hardened, High Performance, Flat, 1/2 in. ID, 1.300 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Set of 2

$5.95

MANLEY Washer, Intake Bolt, Steel, Zinc, .100 in. Thick, Each

MANLEY Washer, Intake Bolt, Steel, Zinc, .100 in. Thick, Each

$0.91

ARP Washer, Hardened, High Performance, Flat, 1/4 in. ID, 0.500 in. OD, 0.063 Thick, Cad Plated, Each

ARP Washer, Hardened, High Performance, Flat, 1/4 in. ID, 0.500 in. OD, 0.063 Thick, Cad Plated, Each

$0.56