Black Washers - 9/16 ID x 1 OD (10)

The Black Washers – 9/16 ID x 1 OD (10) are precision fastener components engineered for high-performance automotive builds and critical mechanical assemblies. Whether you're rebuilding a stroker engine, installing custom headers, or securing suspension components, these hardened washers distribute load evenly and prevent fastener pull-through on aluminum, composite, or softer materials. Available in a pack of 10, they're an essential supply for any serious mechanic or enthusiast tackling engine bay modifications, brake system upgrades, or transmission work where bolt clamping integrity matters.

These washers feature a 9/16-inch inner diameter (ID) with a 1-inch outer diameter (OD), delivering a bearing surface large enough to support ARP fasteners and other premium hardware under sustained load and vibration cycles. The black oxide finish resists corrosion in engine compartments and underbody environments while maintaining a professional appearance. The precision geometry ensures proper seating against bolt heads and nuts, critical for maintaining clamping force in high-rpm applications where thermal expansion and vibration can loosen connections. Their compact 0.3-inch thickness integrates seamlessly into tight engine bay layouts without requiring modified hardware.

Mechanics and engine builders benefit most from these washers when pairing them with ARP fastening systems in cylinder head work, intake manifold installations, and performance fuel system plumbing. The 10-pack quantity ensures you have coverage for a complete engine build or as backup stock for future projects. Compatibility spans small-block and big-block platforms, LS engines, and vintage muscle car rebuilds where original fastener specifications demand proper load distribution. For anyone performing a top-end rebuild, turbo installation, or custom exhaust work, including quality washers in your fastener selection prevents costly stripped threads and ensures bolts stay tight through dyno runs and road miles.