Grade 8 USS Thick Flat Washer Zinc Plated 3/8

This Grade 8 USS thick flat washer fits 3/8-inch bolts and is manufactured from high-strength, through-hardened alloy steel with a yellow zinc chromate finish to provide excellent tensile strength and moderate corrosion resistance. Designed to meet ASME B18.21.1 specifications, it delivers a wide bearing surface to distribute loads, reduce joint damage, and help prevent loosening under vibration in demanding applications.