Engineered for outdoor strength and dependable wood-to-wood connections, the A307 Grade A Steel Hot Dipped Galvanized Coarse Carriage Bolts (5/16-18 x 1-1/2) deliver reliable performance in decking, fencing, timber framing, and other demanding projects. The hot-dip galvanized finish provides excellent corrosion resistance, while the coarse 5/16-18 threads offer solid bite in wood. Each bolt features a round carriage head with a square neck to prevent rotation during installation.

Key Features

• Material: A307 Grade A steel for dependable strength and ductility.
• Finish: Hot-dip galvanized coating for superior corrosion resistance in outdoor and damp locations.
• Thread: Coarse 5/16-18 thread for quick, secure gripping in softwoods and many hardwoods.
• Size: 5/16″ diameter, 1-1/2″ length (coarse thread standard).
• Head & Design: Round carriage bolt head with square neck to prevent rotation during installation.
• Applications: Ideal for decks, fences, timber framing, outdoor furniture, and other wood-to-wood assemblies.

Applications

• Decking and outdoor living projects
• Fence construction and repairs
• Timber framing and structural wood connections
• Outdoor furniture and pergolas

Specifications

• Diameter: 5/16 in
• Thread: Coarse 5/16-18
• Length: 1-1/2 in
• Material: A307 Grade A steel
• Finish: Hot-dip galvanized
• Head style: Round carriage bolt with square neck