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.