Split Lock Washer Lock Washer Type Split Lock Finish Zinc Plated Material Spring Steel For Screw Size 1/4 in Inside Diameter 0.26 in Outside Diameter 0.487 in Maximum Thickness 0.062 in Minimum Thickness 0.062 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 0.062 in to 0.109 in Package Quantity 100