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, 0.625 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

Manley Washer, 5/16", Kit

Manley Washer, 5/16", Kit

$8.75

ARP Washer, Hardened, High Performance, Flat, 1/2 in. ID, 1.300 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Set of 10

ARP Washer, Hardened, High Performance, Flat, 1/2 in. ID, 1.300 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Set of 10

$25.56

ARP Washer, Hardened, High Performance, Chamfer, Flat, 7/6 in. ID, 0.660 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Each

ARP Washer, Hardened, High Performance, Chamfer, Flat, 7/6 in. ID, 0.660 in. OD, Chromoly, Black Oxide, 0.12 in. Thick, Each

$2.10

ARP Washer, Hardened, High Performance, Chamfer, Flat, 10mm ID, 16mm OD, 1.9mm Thick, Stainless Steel, Polished, Set of 2

ARP Washer, Hardened, High Performance, Chamfer, Flat, 10mm ID, 16mm OD, 1.9mm Thick, Stainless Steel, Polished, Set of 2

$6.20