Black Washer 5/8 ID x 1.30 OD 1pk

The Black Washer 5/8 ID x 1.30 OD 1pk is a precision flat washer engineered for fastener applications requiring reliable load distribution and vibration resistance. This component serves as a critical spacer and bearing surface in mechanical assemblies across automotive, firearms, industrial, and tactical equipment builds. By spreading fastener load across a wider surface area, the washer prevents bolt heads and nuts from sinking into softer materials while maintaining consistent clamping force under operational stress.

Manufactured to ARP specifications, this black-finished washer features a 5/8-inch inner diameter (ID) with a 1.30-inch outer diameter (OD), providing optimal surface contact for medium-duty fastening applications. The black oxide or phosphate finish delivers corrosion resistance and a professional appearance while reducing light reflection—a practical advantage in tactical and firearms assembly work. The washer's compact profile and precise dimensional tolerance ensure compatibility with standard fastening systems and eliminate binding or misalignment during installation.

Builders, gunsmiths, and equipment technicians depend on ARP washers for critical fastening applications where joint integrity and longevity matter. This single-pack washer integrates seamlessly into bolt-together assemblies, chassis work, rail systems, and component mounting where load distribution and vibration damping are essential. The flat design accommodates both countersunk and protruding fastener heads, making it suitable for AR platform builds, precision rifle work, and general mechanical assembly requiring professional-grade hardware.