Swivel Flange Nut Material Grade/Class Not Graded Material Steel Finish Black Oxide Thread Size 1/2 In.-13 Hex Width 7/8 in Hex Height 1/2 in Flange Diameter 1 1/8 in System of Measurement Inch Color Black Flange Thickness 0.219 in Hex Type Swivel Flange Nut Overall Height 23/32 in Pack Size Small Pack Rockwell Hardness Nut - 25 Rokwell Collar - 85-90 Rockwell on 15N Scale Thread Direction Right Hand