Black Washers - 10mm ID x .850 OD (10)

ARP Black Washers – 10mm ID x .850 OD (10) are precision fastener components designed for critical tactical and military applications where reliable load distribution and vibration resistance are essential. These washers serve as crucial spacers and stress-distribution components that help prevent bolt loosening under recoil and sustained fire, making them ideal for assembling AR platforms, securing optic mounts, or rebuilding bolt carrier groups.

Featuring a 10mm inner diameter and .850 outer diameter, these black finish washers provide an optimal bearing surface for standard fastener applications common in AR-15 and AR-10 assembly sequences. The precision-stamped construction ensures consistent thickness and concentricity, while the engineering maintains tight tolerances that prevent micro-movement at the fastener interface, which is critical in high-recoil rifle platforms.

Armorers, gunsmiths, and field technicians rely on ARP washers for upper and lower receiver assembly, scope mount base installation, and handguard stabilization tasks. These washers are particularly valuable when replacing worn fasteners or upgrading components, ensuring reliable performance in various applications.