5/16-18 x 4 Hex Head Cap Screws Steel Grade 2 Zinc Plating (Quantity: 50 pcs) - Coarse Thread UNC Partially Threaded Length: 4 Inch Thread Size: 5/16 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 2 Hex Cap Screw should only utilize a Grade 2 hex nut