Grade 8 USS Thick Flat Washer Zinc Plated 5/8

This Grade 8 USS thick flat washer is designed for 5/8-inch bolts and manufactured from through-hardened alloy steel for superior strength. Featuring a yellow zinc chromate finish for moderate corrosion resistance, it meets ASME B18.21.1 dimensional and mechanical standards. Its extra-thick design distributes loads over a larger area, reduces surface damage, and helps prevent loosening under vibration or dynamic loads.