Fender Washer, Flat Washer Type Oversized, Dimensional Standards ASME B18.22.1, Material Steel, Material Grade/Class Case Hardened, Finish Zinc-Plated, For Screw Size 5/16 in, Inside Diameter 0.344 in, Outside Diameter 2 in, Maximum Thickness 3/64 in, System of Measurement Inch, Minimum Thickness 3/64 in, Inside Diameter Tolerance +/-0.029 in, Material Quality Standards ASTM A108, Outside Diameter Tolerance +/-0.029 in, Pack Size Small Pack, Rockwell Hardness B40, Thickness Tolerance +0.029 in