Hillman Paulin - 3/8 x 3" Carriage Bolt - Steel Galvanized

Hillman Paulin 3/8" x 3" Hot Dipped Galvanized Carriage Bolt – Heavy-Duty Exterior Fastener for Wood Construction 

Product description

This Hillman Paulin 3/8" x 3" hot dipped galvanized carriage bolt is a heavy-duty fastening solution designed for demanding wood construction and metal-to-wood connections where standard wood or deck screws are not strong enough. The square neck under the round carriage bolt head locks into the wood to prevent spinning during tightening, delivering a secure, long-lasting joint for decks, fences, pergolas, and other exterior wood structures.

Manufactured with a hot dipped galvanized coating, this carriage bolt offers superior corrosion resistance for outdoor and exposed environments compared to standard zinc-plated hardware. The thick galvanized layer provides excellent protection in pressure-treated lumber, coastal areas, and high-moisture locations, making these bolts ideal for professional contractors and serious DIY builders working on decks, fences, pergolas, sheds, and structural wood projects.

Use these structural carriage bolts for:

• Wood-to-wood and metal-to-wood construction in decks, fences, pergolas, and outdoor framing

• Attaching beams, posts, and brackets where high shear strength and pull-out resistance are required

• Exterior projects using treated lumber, cedar, or other outdoor-rated wood

For best performance, install these bolts with matching hot dipped galvanized nuts and flat or fender washers to create a larger bearing surface and prevent the head and nut from embedding into the wood. Pre-drill bolt holes to size, insert the carriage bolt with the square neck seated into the wood, then tighten the nut to draw the materials together for a solid, structural connection.

Key features

• Brand: Hillman Paulin – contractor-grade, trusted exterior fasteners

• Size: 3/8" diameter x 3" length galvanized carriage bolt

• Head type: round head with square neck (carriage bolt design to prevent spinning)

• Finish: hot dipped galvanized for superior rust and corrosion resistance in outdoor use

• Ideal for decks, fences, pergolas, sheds, and exterior wood structures

• Excellent for wood-to-wood and metal-to-wood construction where screws are not strong enough

• Compatible with flat washers or fender washers for improved load distribution and joint strength