5/16-18X1 Carriage Bolt Grade 8 Fully Threaded Plain (Pack Qty 1,275) BC-3116C8P

Low Carbon Steel Carriage: The square neck is designed to keep the bolt from turning as a nut is tightened. Hot-Dip Galvanized Steel Carriage: Same design advantages as a low carbon carriage bolt but with a thicker protective coating for outdoor use. Often used in outdoor furniture Low Carbon Steel & Hot-Dip Galvanized Steel Carriage: AISI 1006 - 1050 or equivalent steel used to fasten metal to metal or metal to wood