Hex Nut, Hex Type Standard Hex, Finish Black Oxide, Material Grade/Class Grade 2, Material Steel, Thread Size 1/2 In.-10, Hex Width 7/8 in, Hex Height 31/64 in, System of Measurement Inch, Thread Direction Right Hand, Rockwell Hardness B85, Thread Pitch 0.1 in, Thread Type Acme, Package Quantity 40