S/S Flat Washer - 1/4 ID x 9/16 OD (1)

The ARP S/S Flat Washer – 1/4 ID x 9/16 OD is a precision stainless steel fastener component engineered for general-purpose applications where corrosion resistance and load distribution are critical. Flat washers serve as load spreaders under bolt heads and nuts, protecting softer materials from surface damage and distributing clamping force across a wider footprint. Whether you're assembling tactical equipment, performing maintenance on firearms, or working on marine and outdoor projects, this stainless steel washer provides reliable performance in demanding environments.

Manufactured to exacting standards, this flat washer features a 0.25-inch inner diameter sized for 1/4-inch fasteners and a 0.563-inch outer diameter that delivers optimal load distribution without excess material. The 0.075-inch thickness provides adequate rigidity while maintaining compatibility with standard fastener assemblies. Constructed from 300-series stainless steel, the washer resists oxidation, rust, and corrosion even in high-humidity, saltwater, or chemically aggressive environments—making it ideal for field operations, coastal applications, and long-term storage. The smooth finish and precision dimensions ensure consistent seating and predictable performance across multiple installations.

Tactical professionals, armorers, and maintenance technicians rely on stainless steel washers to prevent fastener pull-through on polymer, composite, and softer metal surfaces common in rifle builds, optic mounts, and equipment assembly. This washer integrates seamlessly with standard 1/4-inch hardware and pairs naturally with ARP fasteners and other quality fastening systems. Sold individually, it serves as a replacement component or bulk inventory item for shops, ranges, and field kits where corrosion-resistant fastener hardware is non-negotiable.