Lock Washer Lock Washer Type Internal Tooth Lock Finish Plain Material Stainless Steel For Screw Size 1/2 in Inside Diameter 0.512 in Outside Diameter 0.867 in Maximum Thickness 0.037 in Color Black Dimensional Standards ASME B18.21.1 Made in North America No Manufacturer Location Globally Sourced Material Grade/Class 410 Material Quality Standards SAE J405 410 Maximum Temperature 500 Degrees F Minimum Temperature -25 Degrees F Pack Size Small Pack REACH Compliant Yes