9/16-18 x 6 Hex Head Cap Screws Steel Grade 5 Plain Finish (Quantity: 75 pcs) - Fine Thread UNF Partially Threaded Length: 6 Inch Thread Size: 9/16 Inch

When selecting a nut to be used for a graded hex cap screw keep in mind that the nut should have the same grade as the bolt/screw. For instance a Grade 5 Hex Cap Screw should only utilize a Grade 5 hex nut