Split Lock Washer Lock Washer Type Split Lock Finish Zinc Plated Material Spring Steel For Screw Size #6 Inside Diameter 0.148 in Outside Diameter 0.25 in Maximum Thickness 0.031 in Minimum Thickness 0.031 in Dimensional Standards ASME B18.21.1 Material Grade/Class Grade 2 Pack Size Small Pack Rockwell Hardness C38 System of Measurement Inch Thickness Tolerance 0.031 in to 0.047 in Package Quantity 100