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