Carriage Bolts

Carriage Bolts for Secure, Clean, and Reliable Fastening

Carriage bolts are versatile fasteners designed to provide strong, tamper-resistant connections with a smooth, finished appearance. Recognized by their rounded, dome-shaped head and square neck, carriage bolts are commonly used in woodworking, construction, fencing, furniture assembly, and light structural applications where both performance and appearance matter.

Unique Design for Non-Rotating Installation

The defining feature of a carriage bolt is the square neck located directly beneath the head. When installed into a square or pre-drilled round hole in wood, the square neck bites into the material, preventing the bolt from turning as the nut is tightened. This design allows for one-sided installation and ensures a secure hold without damaging the surface. The smooth, low-profile head sits flush against the material, creating a clean and professional finish.

Strength, Materials, and Finish Options

Carriage bolts are typically manufactured from low- to medium-carbon steel for dependable strength in light- to medium-duty applications. They are also available in higher-strength options and materials such as stainless steel for enhanced corrosion resistance in outdoor or moisture-prone environments. Common finishes include plain, zinc-plated, and hot-dipped galvanized coatings, providing protection against rust while extending service life in exposed conditions.

Common Applications Across Industries

Carriage bolts are widely used in wood-to-wood and wood-to-metal connections, making them ideal for decks, docks, playground equipment, fencing, cabinetry, and outdoor structures. Their tamper-resistant head design makes them especially popular for public installations where safety and security are priorities. In agricultural and industrial settings, carriage bolts are often used in light equipment assembly and maintenance tasks.

Key Advantages of Carriage Bolts

Smooth, rounded head for a clean finished appearance

Square neck prevents rotation during tightening

Ideal for wood and light structural applications

Available in corrosion-resistant finishes

Suitable for indoor and outdoor use

For dependable fastening that combines strength, simplicity, and a polished look, carriage bolts remain a trusted solution for contractors, builders, and maintenance professionals alike.