Hex Nut Hex Type Standard Hex Finish Black Oxide Material Grade/Class Grade 2 Material Steel Thread Size 2 1/4 In.-12 Hex Width 3 3/8 in Hex Height 1 15/16 in Dimensional Standards ASME B18.2.2 System of Measurement Inch Thread Direction Right Hand Pack Size Small Pack Removable Yes Rockwell Hardness B68 to C32 Thread Type Fine