Extra Thick USS Washer, Flat Washer Type USS, Material Steel, Material Grade/Class Grade 8, Finish Zinc Yellow, For Screw Size 5/16 in, Inside Diameter 0.375 in, Outside Diameter 7/8 in, Maximum Thickness 1/8 in, System of Measurement Inch, Minimum Thickness 7/64 in, Color Yellow, Material Quality Standards ASTM A325, ASTM A490, ASTM F436, Pack Size Small Pack, Resistance Properties Corrosion-Resistant, Rockwell Hardness C38, Package Quantity 100