5/16 in.-18 x 2-1/2 in. Galvanized Carriage Bolt (25-Pack)
Everbilt. $31.99. In stock.
Carriage bolts have a smooth rounded head with a square neck underneath that locks into wood when tightened. Use with a pre-drilled hole and secure with a hex nut and washer to prevent spinning. They are great fasteners for decks, play equipment, docks, fencing, and furniture.
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