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Carriage bolts are designed with a smooth, rounded head and a square section that helps grip the material as the bolt is tightened. Originally used in horse-drawn carriage manufacturing, these bolts have become staples in woodworking, metalworking, and other applications where a strong, secure joint is required. The added square neck keeps the bolt from spinning when a nut is tightened, making installation easier and ensuring a powerful grip on the materials being joined.


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3 4 16 nut