Grade 8 USS Thick Flat Washer Zinc Plated 1/4

This Grade 8 USS thick flat washer is designed for 1/4-inch bolts, made from high-strength alloy steel with a yellow zinc chromate finish for moderate corrosion resistance. It provides a large bearing surface to distribute loads, reduce surface damage, and prevent loosening under vibration, meeting ASME B18.21.1 dimensional standards and Grade 8 hardness specifications.