Flange Nut Material Grade/Class Not Graded Material Steel Finish Black Oxide Thread Size M12-1.75 Hex Width 19 mm Hex Height 17 mm Flange Diameter 27 mm System of Measurement Metric Color Black Flange Thickness 4 mm Hex Type Flange Nut Overall Height 17 mm Pack Size Small Pack Rockwell Hardness 85-90 Rockwell on 15N Scale Thread Direction Right Hand