Split Lock Washer Lock Washer Type Split Lock Finish Hot Dipped Galvanized Material Steel For Screw Size 5/16 in Inside Diameter 0.322 in Outside Diameter 0.583 in Maximum Thickness 0.078 in Minimum Thickness 0.078 in Color Silver Dimensional Standards ASME B18.21.1 Inside Diameter Tolerance 0.314 in to 0.322 in Made in North America No Manufacturer Location Globally Sourced Material Grade/Class Grade 2 Maximum Temperature Not Applicable Minimum Temperature Not Applicable