Flange Nut Material Grade/Class Not Graded Material Steel Finish Black Oxide Thread Size 5/8 In.-11 Hex Width 1 1/16 in Hex Height 13/16 in Flange Diameter 1 3/8 in System of Measurement Inch Color Black Flange Thickness 0.188 in Hex Type Flange Nut Overall Height 13/16 in Pack Size Small Pack Rockwell Hardness 85-90 Rockwell on 15N Scale Thread Direction Right Hand