Split Lock Washer, Lock Washer Type Split Lock, Finish Zinc Plated, Material Steel, For Screw Size M20, Inside Diameter 20.2 mm, Outside Diameter 33.6 mm, Maximum Thickness 4 mm, Minimum Thickness 4 mm, Color Silver, 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