Flange Nut, Material Grade/Class Not Graded, Material Steel, Finish Black Oxide, Thread Size M20-2.5, Hex Width 30 mm, Hex Height 25 mm, Flange Diameter 40 mm, System of Measurement Metric, Color Black, Flange Thickness 6 mm, Hex Type Flange Nut, Overall Height 25 mm, Pack Size Small Pack, Rockwell Hardness 85-90 Rockwell on 15N Scale, Thread Direction Right Hand