Stainless Carriage Bolts Size Black Galvanized Carriage Bolt Brass Carriage Bolts

Descripción

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.