Split Lock Washer Lock Washer Type Split Lock Finish Black Oxide Material Spring Steel For Screw Size M2 Inside Diameter 2.1 mm Outside Diameter 4.4 mm Maximum Thickness 0.5 mm Minimum Thickness 0.5 mm Color Black Dimensional Standards DIN 127 B Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C44 System of Measurement Metric Thickness Tolerance +/-0.10 mm Package Quantity 100