Flat Washer, Flat Washer Type Oversized, Dimensional Standards ASME B18.22.1, Material Steel, Material Grade/Class Class 8.8, Finish Black Oxide, For Screw Size #4, Inside Diameter 0.125 in, Outside Diameter 5/16 in, Maximum Thickness 0.078 in, System of Measurement Inch, Minimum Thickness 0.078 in, Color Clear, Inside Diameter Tolerance 0.12-0.133, Made in North America No, Manufacturer Location Globally Sourced, Material Quality Standards ASTM A-325, Maximum Temperature 350 Degrees C