Hex Nut, Hex Type Heavy Hex, Finish Black Oxide, Material Grade/Class Grade 2H, Material Steel, Thread Size 5/16 In.-18, Hex Width 9/16 in, Hex Height 19/64 in, Manufacturer Location Globally Sourced, Dimensional Standards ASME B18.2.2, Material Quality Standards ASTM A194, System of Measurement Inch, Thread Direction Right Hand, Color Black, Made in North America No, Maximum Temperature 850 Degrees F, Minimum Temperature -20 Degrees F, Minimum Yield Strength Not Applicable, Pack Size Small Pack