Split Lock Washer Lock Washer Type Split Lock Finish Plain Material Stainless Steel For Screw Size M18 Inside Diameter 18.2 mm Outside Diameter 29.4 mm Maximum Thickness 3.5 mm Minimum Thickness 3.5 mm Dimensional Standards DIN 127 B Material Grade/Class 18-8 Pack Size Small Pack Rockwell Hardness C35 Package Quantity 10