Spherical 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 1/4 in System of Measurement Inch Color Black Compatible Washer Manufacturer Part Number 42745 Maximum Rotation 2 Degrees Nut Finish Black Oxide Pack Size Small Pack Rockwell Hardness 85-90 Rockwell on 15N Scale