Split Lock Washer Lock Washer Type Split Lock Finish Blue Phosphate Material Steel For Screw Size M3 Inside Diameter 3.5 mm Outside Diameter 5.5 mm Maximum Thickness 1 mm Minimum Thickness 1 mm Color Blue Dimensional Standards DIN 7980 Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness HRC44 System of Measurement Metric Thickness Tolerance +/-0.100 mm Package Quantity 100