Flange Nut Material Grade/Class Not Graded Material Steel Finish Black Oxide Thread Size 1/2 In.-20 Hex Width 7/8 in Hex Height 11/16 in Flange Diameter 1 1/8 in System of Measurement Inch Color Black Flange Thickness 0.188 in Hex Type Flange Nut Overall Height 11/16 in Pack Size Small Pack Rockwell Hardness 85-90 Rockwell on 15N Scale Thread Direction Right Hand