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

The ARP Black Washers – 10mm ID x .850 OD set of 10 units (SKU ARP200-8592) serves as a critical fastening component in precision assembly work across tactical, military, and firearms manufacturing environments. These flat washers distribute load evenly across bolt heads and nuts, preventing surface damage and ensuring secure, long-term fastening in high-stress applications. Whether you're building custom AR platforms, assembling tactical equipment, or maintaining critical gear systems, reliable washers are foundational to structural integrity and performance.

Each washer in this ARP set features a 10mm inner diameter and 0.850-inch outer diameter with 0.115-inch thickness, manufactured from chromoly steel and finished in black oxide for superior corrosion resistance and durability. The black oxide coating not only provides aesthetic consistency with tactical weapon systems and equipment but also protects against rust and oxidation in field conditions, humid storage, and outdoor environments. Chromoly construction delivers exceptional tensile strength and fatigue resistance, essential when fasteners undergo repeated stress cycles or must withstand vibration in operational settings.

Law enforcement armorers, military technicians, and firearms enthusiasts rely on ARP precision fasteners for critical assembly and maintenance tasks where failure is not an option. These washers are compatible with standard 10mm metric fastening systems and excel in upper receiver builds, rail systems, and any application requiring load distribution across 10mm hardware. The set of 10 units provides sufficient inventory for multiple projects or on-hand spare stock, ensuring you're never caught without critical fastening components when field repairs or builds demand immediate attention.