Flange Nut Material Grade/Class Not Graded Material Steel Finish Black Oxide Thread Size 5/16 In.-24 Hex Width 9/16 in Hex Height 3/8 in Flange Diameter 3/4 in System of Measurement Inch Color Black Flange Thickness 0.125 in Hex Type Flange Nut Overall Height 3/8 in Pack Size Small Pack Rockwell Hardness 85-90 Rockwell on 15N Scale Thread Direction Right Hand