Black Washers - 5/16 ID x 13/16 OD (10)

The Black Washers - 5/16 ID x 13/16 OD (10) from ARP represent a critical component for high-performance mechanical assemblies requiring precise load distribution. Engineered from premium chromoly steel, these specialized flat washers are designed to withstand significant stress without deforming. Whether you are looking to buy replacements for an automotive project or reviewing technical specifications for a custom build, these fasteners provide the industrial-grade reliability associated with the ARP brand.

Each washer in this set features a chamfered edge, a design element specifically included to accommodate the radius under the head of high-strength bolts. This ensures a flush fit and prevents interference that could lead to improper torque readings or fastener failure. The 0.313-inch inner diameter and 0.813-inch outer diameter are precision-machined to tight tolerances, ensuring consistent performance across all ten units in the package.

The black oxide finish on these Black Washers - 5/16 ID x 13/16 OD (10) serves both functional and aesthetic purposes. This chemical treatment enhances corrosion resistance, protecting the underlying chromoly steel from environmental degradation in demanding engine bays or industrial environments. At 0.12 inches thick, these washers provide a substantial bearing surface that effectively spreads clamping force to protect your mating surfaces.

Choosing the right hardware is essential for maintaining the structural integrity of any assembly. These ARP special-purpose washers are for sale as a complete set of ten, providing a uniform solution for multi-bolt patterns. By utilizing chromoly construction rather than standard mild steel, these components offer a higher tensile strength and superior resistance to crushing under high torque loads, making them a standard choice for professional technicians.