Hex Nut Hex Type Heavy Hex Finish Black Oxide Material Grade/Class Grade C Material Steel Thread Size 1/2 In.-13 Hex Width 7/8 in Hex Height 1/2 in Material Quality Standards ASTM 563 System of Measurement Inch Thread Direction Right Hand Pack Size Small Pack Removable Yes Rockwell Hardness B78 to C38 Thread Type Coarse Package Quantity 50