Lock Washer Lock Washer Type Internal and External Tooth Lock Finish Zinc Plated Material Steel For Screw Size #4 Inside Diameter 0.123 in Outside Diameter 0.475 in Maximum Thickness 0.021 in Color Silver Dimensional Standards ASME B18.21.1 For Use With Lock Washers Made in North America No Manufacturer Location Globally Sourced Material Grade/Class Grade 2 Maximum Temperature Not Applicable Minimum Temperature Not Applicable Pack Size Small Pack REACH Compliant Yes