Split Lock Washer Finish Black Oxide Material Steel For Screw Size 9/16 in Inside Diameter 0.564 in Outside Diameter 0.975 in Maximum Thickness 0.17 in Minimum Thickness 0.17 in Color Black Dimensional Standards ASME B18.21.1 Inside Diameter Tolerance 0.564 in to 0.574 in Made in North America No Manufacturer Location Globally Sourced Material Grade/Class Grade 2 Maximum Temperature Not Applicable Minimum Temperature Not Applicable Outside Diameter Tolerance 0.975 in