Spherical Flange Nut Material Grade/Class Not Graded Material Steel Finish Black Oxide Thread Size 5/8 In.-11 Hex Width 1 39/64 in Hex Height 5/8 in Flange Diameter 1 3/4 in System of Measurement Inch Color Black Compatible Washer Manufacturer Part Number 42746 Maximum Rotation 2 Degrees Nut Finish Black Oxide Pack Size Small Pack Rockwell Hardness 85-90 Rockwell on 15N Scale