Split Lock Washer Lock Washer Type Split Lock Finish Black Oxide Material Steel For Screw Size M8 Inside Diameter 8.1 mm Outside Diameter 14.8 mm Maximum Thickness 2 mm Minimum Thickness 2 mm Color Black Dimensional Standards DIN 127 B Inside Diameter Tolerance +/-0.127 mm Made in North America No Manufacturer Location Globally Sourced Material Grade/Class Not Graded Material Quality Standards ASTM A307A SAE J429 Maximum Temperature 275 Degrees F