Spherical Flange Nut Material Grade/Class 18-8 Material Stainless Steel Finish Black Oxide Thread Size 1/2 In.-13 Hex Width 7/8 in Hex Height 17/32 in Flange Diameter 1 1/4 in System of Measurement Inch Compatible Washer Manufacturer Part Number 47743 Maximum Rotation 2 Degrees Nut Finish Plain Pack Size Small Pack Rockwell Hardness 27 Rockwell