Flange Nut Material Grade/Class 18-8 Material Stainless Steel Finish Plain Thread Size 1/4 In.-20 Hex Width 1/2 in Hex Height 7/32 in Flange Diameter 5/8 in System of Measurement Inch Flange Thickness 0.094 in Hex Type Flange Nut Overall Height 5/16 in Pack Size Small Pack Rockwell Hardness 27 Rockwell Thread Direction Right Hand