Flange Nut, Material Grade/Class Not Graded, Material Steel, Finish Black Oxide, Thread Size 5/16 In.-18, 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