Stainless Carriage Bolts Size Black Galvanized Carriage Bolt Brass Carriage Bolts

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Stainless Carriage Bolts Size Black Galvanized Carriage Bolt Brass Carriage Bolts

What Are Carriage Bolts?

Carriage bolts (also known as coach bolts ) are a type of fastener with a smooth, domed head and a square neck beneath the head. They are designed to prevent rotation when tightened, making them ideal for wood-to-metal or wood-to-wood connections.

Materials of Carriage Bolts

Carriage bolts are made from various materials depending on strength and environmental needs:

Surface Finishes

Specifications & Types

Carriage bolts are categorized by head type, thread, and length :

A. Standard Carriage Bolt (ASTM A307 / DIN 603)
Head: Smooth, rounded dome
Neck: Square section under the head (prevents spinning)
Thread: Partially or fully threaded
Sizes:
Diameter: 1/4″ to 3/4″ (imperial), M6 to M20 (metric)
Length: 1/2″ to 12″ (varies by application)

B. Heavy-Duty Carriage Bolt
Material: Grade 5 or 8 carbon steel
Used in: Structural applications (e.g., timber framing)

C. Stainless Steel Carriage Bolt
Material: 304 or 316 stainless steel
Used in: Marine, food processing, chemical industries

Applications

Wood Construction: Decking, fencing, timber framing
Furniture Assembly: Bed frames, wooden benches
Agriculture & Trailers: Securing wooden planks to metal frames
Marine & Outdoor: Dock construction, boat fittings (stainless steel)
Playground Equipment: Safe, smooth-head design reduces injury risk

Case Examples

Deck Building: Hot-dip galvanized 1/2″ x 4″ carriage bolts secure wooden beams to metal brackets.
Farm Fencing: Zinc-plated 3/8″ x 6″ carriage bolts attach wooden fence posts to rails.
Boat Dock: 316 stainless steel 5/16″ x 3″ carriage bolts fasten wooden planks to steel pilings.

Safety & Installation Tips

✔ Pre-drill holes in wood to prevent splitting.
✔ Ensure the square neck is fully seated to prevent rotation.
✔ Use washers under the nut for better load distribution.