Black Washer - 7/16 ID x 13/16 OD (1)

The ARP Black Washer – 7/16 ID x 13/16 OD is a precision flat washer designed for critical fastening applications in tactical and military equipment assemblies. This washer is essential for anyone involved in building custom AR platforms, maintaining law enforcement duty weapons, or assembling modular gear systems, ensuring proper load distribution and fastener security.

Manufactured by ARP, this black washer features a 7/16-inch inner diameter and a 13/16-inch outer diameter, allowing it to seat properly under fastener heads. Its flat profile is designed to prevent fasteners from pulling through softer materials or damaging precision-machined components, which is particularly important in aluminum receiver work or composite furniture assembly. The black oxide or phosphate finish provides corrosion resistance in field conditions.

Armorers, gunsmiths, and platform builders will find this washer beneficial in their toolkit, especially in high-stress applications where component integrity is crucial. At a verified weight of 0.02 lbs, it adds minimal weight to any platform while enhancing load management and fastener longevity.