Black Washer - 7/16 ID x 7/8 OD (1)

The Black Washer - 7/16 ID x 7/8 OD by ARP is a precision-engineered flat washer designed for high-performance fastening applications where load distribution and clamping force retention are critical. This single washer is ideal for firearms assembly, engine builds, and mechanical projects requiring chromoly-grade hardware. The chamfered design ensures smooth seating against bolt heads and nuts, preventing edge damage and improving joint integrity in demanding environments.

Manufactured from chromoly steel and finished in black oxide coating, this 7/16-inch ID x 7/8-inch OD washer offers superior corrosion resistance and a professional appearance. The black oxide surface treatment provides a thin, protective layer that resists rust and oxidation without compromising the washer's structural properties. At 0.12 inches thick, it delivers optimal load distribution across a wider surface area than standard washers, reducing stress concentration and extending the service life of fastened assemblies. The chamfered edges facilitate easier installation while preventing burring of surrounding surfaces.

This washer is essential for builders and technicians working on AR-15 platforms, ARP engine fastener kits, and precision machinery where OEM-specification washers are required. The 7/16-inch bore accommodates standard fasteners in mid-size applications, making it compatible with common bolt sizes used in tactical builds and performance automotive projects. A single washer is provided; ensure proper counting when ordering multiple units for complete assembly projects. For optimal results, pair with matching ARP fasteners and follow manufacturer torque specifications.