Split Lock Washer Lock Washer Type Split Lock Finish Zinc Plated Material Spring Steel For Screw Size #12 Inside Diameter 0.227 in Outside Diameter 0.377 in Maximum Thickness 0.056 in Minimum Thickness 0.056 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 0.056 in to 0.070 in Package Quantity 100