Conquest 5/16″ x 1-1/4″ A307 Carriage Bolt with Galvanized Finish

When pairing a nut with a hex bolt, the material and finish must match. If these do not match, the nut will not fit the bolt.

The Conquest 5/16″ A307 Carriage Bolt with a hot dip galvanized finish delivers strength, corrosion resistance, and a clean finished appearance for demanding outdoor and treated lumber applications. Manufactured to ASTM A307 specifications and designed with a square neck to prevent spin during installation, this carriage bolt provides dependable fastening you can trust.

Durable Galvanized Fasteners for Decks, Fencing & Wood Frames

Featuring coarse threads (18 TPI) and a smooth, rounded head, this galvanized carriage bolt is ideal for woodtowood or woodtometal structural connections where both performance and appearance are important. Pair with compatible hot dip galvanized hex nuts and washers for secure, longlasting results in decks, pergolas, fencing, and marineadjacent builds.

Key Features

• ASTM A307 Compliant: Built to meet industry standards for lowcarbon steel tensile strength and generalpurpose use.
• Hot Dip Galvanized Finish: Provides excellent corrosion resistance for outdoor, treated lumber, and highmoisture environments.
• Square Neck Design: Prevents rotation while tightening for quick, secure installation.
• Rounded Head Profile: Creates a smooth, finished look and reduces snag hazards on exposed surfaces.
• Coarse 18 TPI Thread: Delivers strong engagement in wood, metal, and composite assemblies.
• Versatile Applications: Perfect for decks, fencing, pergolas, framing, marine adjacent projects, and more.

Common Applications

• Deck construction in outdoor and high-moisture environments
• Wood fencing installations including treated lumber and pasture fencing
• Pergolas, timber frames, and other outdoor wooden structures
• Marine or coastal projects where corrosion resistance is critical
• Structural wood-to-wood or wood-to-metal joints in construction and landscaping

Installation Tips

• Drill a clearance hole so the square neck seats securely into the wood and prevents spinning
• Use only hot dip galvanized nuts and washers to maintain full corrosion resistance and proper thread fit
• Tighten from the nut side using a wrench or socket, no need to grip the head
• Ensure full thread engagement when selecting bolt length based on material thickness
• Recheck connections periodically in high-vibration or outdoor installations for long-term integrity

California Residents: WARNING