SAE Flat Washers 5/16 25pk

SAE Flat Washers 5/16 in a 25-pack from ALLSTAR PERFORMANCE are essential fastening components designed for mechanics, fabricators, and DIY enthusiasts who demand reliable hardware for automotive, machinery, and structural assembly work. These washers serve a critical function: they distribute load evenly across bolt heads and nuts, preventing fasteners from sinking into softer materials and reducing stress concentration at connection points. Whether you're building a hot rod, assembling engine components, or performing routine maintenance, a bulk supply of SAE-standard flat washers eliminates frequent trips to the hardware store and ensures you always have the right size on hand.

Each washer in this 25-pack features a 0.313-inch inner diameter sized to fit 5/16-inch fasteners, with an outer diameter of 0.697 inches that provides substantial load-spreading surface area. The 0.065-inch thickness delivers adequate rigidity while maintaining compatibility with standard bolt and screw lengths. Manufactured from hardened steel and finished with a protective zinc oxide coating, these washers resist corrosion and oxidation in both indoor and outdoor environments, extending the service life of your fastened assemblies. The zinc oxide plating also reduces galvanic corrosion when used with dissimilar metals, making these washers suitable for mixed-material automotive and marine applications where durability matters.

Professional mechanics and performance builders rely on SAE flat washers for engine block work, chassis assembly, and suspension fastening where proper load distribution prevents vibration loosening and material damage. The 25-count packaging provides excellent value for high-volume projects or shops that maintain a working inventory of common fastener sizes. Installation is straightforward: simply slide the washer onto your 5/16-inch bolt or screw before tightening, positioning the larger surface against the softer material. These washers meet or exceed SAE standards and are compatible with virtually all 5/16-inch fastening applications, from automotive restoration to equipment maintenance.