Flange Nut, Material Grade/Class 12L14, Material Steel, Finish Black Oxide, Thread Size 5/8 In. -18, Hex Width 1 1/16 in, Hex Height 13/16 in, Flange Diameter 1 3/8 in, System of Measurement Inch, Color Black, Dimensional Standards RoHS Compliant, Flange Thickness 0.188 in, Overall Height 13/16 in, Pack Size Small Pack, Rockwell Hardness 85-90 Rockwell on 15N Scale, Tensile Strength 78, 300 psi, Thread Direction Right Hand, Thread Fit 2B