Crown Bolt 86770 02330 5/16-Inch by 2-1/2-Inch Coarse Thread Zinc Plated Steel Carriage Bolts, 50-Pack Zinc Plated 5/16-Inch X 2-1/2-Inch Carriage Bolt Coarse USS For General Applications 5/16-Inch-18 Body Diameter And Thread Pitch 2-1/2-Inch Fastener Length Coarse Thread