Black Washer - 1/2 ID x 7/8 OD Chamfer (1)

The Black Washer - 1/2 ID x 7/8 OD Chamfer is a precision fastener component engineered for demanding mechanical and firearms applications where load distribution and alignment are critical. Manufactured by ARP, a leader in fastener technology, this special-purpose washer is designed for builders, gunsmiths, and mechanical engineers who require reliable hardware that meets exacting standards. The chamfered design reduces stress concentration and provides superior seating on mating surfaces compared to standard flat washers.

Constructed from chromoly steel with black oxide finish, this washer delivers exceptional durability and corrosion resistance in both indoor and field environments. The 1/2 inch inner diameter and 7/8 inch outer diameter specifications provide optimal load distribution across a wide surface area, while the 0.12 inch thickness ensures structural integrity under pressure. The chamfered edge geometry is critical for high-performance applications—it prevents edge binding, reduces fastener galling, and promotes even clamping force distribution. Black oxide coating protects against rust and oxidation while maintaining the professional appearance demanded in precision work.

This washer is ideal for custom rifle builds, engine assembly, and precision machinery where fastener reliability directly impacts performance and safety. The chamfered design is particularly valuable in applications where bolt holes are not perfectly perpendicular or where repeated assembly and disassembly occurs. Compatible with any fastener system using 1/2 inch diameter bolts or studs, this single unit is sold individually, allowing builders to source exactly what they need for their specific project requirements. Whether assembling a high-end firearm build or completing critical mechanical work, the ARP Black Washer ensures professional-grade fastening performance.