Spherical Flange Nut, Material Grade/Class Not Graded, Material Steel, Finish Black Oxide, Thread Size 1 In.-8, Hex Width 1 5/8 in, Hex Height 1 in, Flange Diameter 2 in, System of Measurement Inch, Color Black, Compatible Washer Manufacturer Part Number 42749, Maximum Rotation 3 Degrees , Nut Finish Black Oxide, Pack Size Small Pack, Rockwell Hardness 85-90 Rockwell on 15N Scale