Black Washers - 7/16 ID x 13/16 OD (10)

Black Washers - 7/16 ID x 13/16 OD (10) are precision flat washers engineered for critical fastening applications where load distribution and dimensional accuracy are non-negotiable. Designed and manufactured by ARP, a trusted leader in high-performance fastener technology, these washers serve as essential components in engine builds, firearms assembly, and heavy-duty mechanical systems. The 10-pack format makes them ideal for both professional builders and enthusiasts who demand consistency across multiple projects.

Each washer features a 7/16-inch inner diameter and 13/16-inch outer diameter with a precisely controlled 0.12-inch thickness, engineered from chromoly steel and finished in black oxide coating. The black oxide treatment provides superior corrosion resistance while reducing friction between fastener and substrate, critical for applications requiring consistent clamping force and minimal relaxation over time. The chromoly construction delivers exceptional tensile strength and durability, making these washers suitable for high-vibration environments where standard mild steel alternatives would fail prematurely.

These Black Washers - 7/16 ID x 13/16 OD (10) excel in precision engine assembly, AR platform builds, and any application requiring validated fastening integrity. The substantial outer diameter relative to the inner opening provides exceptional bearing surface, distributing clamp load across a wider area and protecting soft substrates from fastener head indentation. Ideal for use with 7/16-inch fasteners in critical applications, these washers integrate seamlessly into ARP's complete fastener ecosystem and are compatible with both metric and SAE fastening standards.