Spherical Flange Nut Material Grade/Class 18-8 Material Stainless Steel Finish Black Oxide Thread Size 5/16 In.-18 Hex Width 9/16 in Hex Height 9/32 in Flange Diameter 1 3/4 in System of Measurement Inch Compatible Washer Manufacturer Part Number 47742 Maximum Rotation 5 Degrees Nut Finish Plain Pack Size Small Pack Rockwell Hardness 27 Rockwell