Black Washer - 18mm ID x 2.900 OD (1pk) Chamfer

The ARP Black Washer — 18mm ID x 2.900 OD (1pk) Chamfer is a precision fastener component engineered for high-performance engine assembly and critical structural applications. Built from chromoly steel with black oxide coating, this washer delivers superior load distribution and corrosion resistance in demanding environments where standard fasteners fall short. The 0.45-inch thickness and chamfered design ensure proper seating under extreme pressures and temperature cycling common in racing engines, high-horsepower builds, and heavy-duty industrial equipment.

ARP's chromoly construction provides significantly higher tensile strength than conventional steel, critical for maintaining clamping force and preventing fastener relaxation in turbocharged or supercharged applications. The 18mm inner diameter and 2.9-inch outer diameter geometry is designed to distribute load across a wide contact patch, reducing surface stress and protecting underlying components from deformation. The chamfered edge prevents sharp corners that can catch on gaskets or create stress concentrations, a design detail that extends component life in precision engine work.

This single-pack washer serves engine builders, automotive technicians, and motorsports professionals assembling cylinder heads, manifold flanges, and other critical pressure-containing joints. The black oxide finish resists corrosion in humid shop environments and under engine bay conditions where bare steel would flash rust. Sold individually, this fastener component integrates seamlessly into ARP stud kits and custom fastening systems for engines ranging from naturally aspirated to forced-induction platforms.

ARP fasteners are trusted across professional racing series and serious street/performance builds where fastener failure is not an option. The MPN 200-8793 designation ensures exact fitment with ARP's cylinder head stud kits and engine assembly specifications.