Carriage bolts have a smooth rounded head with a square neck underneath that locks into wood to prevent spinning when tightened. Use with a pre-drilled hole and secure with a hex nut and washer. They are great fasteners for decks, play equipment, docks, fencing, and furniture.
The unique design is great for connections where the head is not accessible for tightening. The self-locking square neck and coarse threads fasten very securely.
All carriage bolts we stock have coarse threading as a standard.
Flat Washers, USS & SAE
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