Hex Nut, Hex Type Heavy Hex, Finish Black Oxide, Material Grade/Class Grade 2HM, Material Steel, Thread Size 1 5/8 In.-8, 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 15