ARP Black Oxide Washers ID OD

ARP black oxide washers are high-performance flat washers for racing, performance and street applications. They give bolts, studs and nuts a flat, consistent bearing surface, and they are also sold as flat washers or hardware washers. ARP offers them with different inside diameters (ID) and outside diameters (OD) to suit its fasteners.

Key Features:

• Black oxide finish: gives the washers a clean, dark appearance.
• Special purpose washers: made from premium chrome moly, parallel-ground and hardened, with or without an ID chamfer.
• General purpose washers: suited to attaching accessories, chassis components and similar jobs. They have an over-sized ID to clear most under-bolt head radii.
• Parallel-ground faces: spread clamping load evenly across the washer's surface.
• Matched to ARP fasteners: sized to pair with ARP bolts, studs and nuts.

Important: General purpose washers are not hardened enough for cylinder heads, mains or connecting rods. Check the individual part listing for the washer type before choosing one for a critical engine application.

ARP is known for precision-engineered, high-strength fasteners. These washers carry that standard of quality into everything from engine builds to chassis and accessory work.