Hex Nut, Hex Type Heavy Hex, Finish Black Oxide, Material Grade/Class Grade 2H, Material Steel, Thread Size 9/16 In.-12, Manufacturer Location Globally Sourced, Material Quality Standards ASTM A194, System of Measurement Inch, Thread Direction Right Hand, Pack Size Small Pack, Rockwell Hardness B55 to C32, Thread Type Coarse/8UN, Package Quantity 200