How to Properly Install Carriage Bolts

Carriage bolts are widely used in wood structures, furniture, and mechanical connections. Their round head and square neck design make them ideal for applications where a flush finish and anti-rotation feature are needed. To ensure a secure fit, it’s important to follow the correct installation steps and use proper fastening methods.

As a professional carriage bolt supplier, Xinchi is glad to introduce how to properly install carriage bolts.

Installation Steps for Carriage Bolts

Drill the Hole
Prepare a hole that matches the diameter of the carriage bolt’s shank. The hole should be slightly larger than the bolt’s body but not oversized so that the square neck can lock firmly into the material.

Insert the Carriage Bolt
Place the bolt through the hole. Ensure that the square neck under the round head fits tightly into the wood or metal to prevent rotation during tightening.

Hammer the Bolt in Place
Lightly tap the round head with a hammer so the square neck bites into the material. This ensures the bolt won’t spin when tightening the nut later.

Tighten the Nut
Place the nut on the threaded end and use a wrench to tighten from the tail side. The round head stays flush on the surface without needing a tool.

Tool Recommendations for Carriage Bolts

When installing carriage bolts, only the nut side needs a wrench or socket. Since the round head has no driving slot, applying torque from the bolt head is not possible.

Use a spanner or socket wrench on the nut side.

For longer bolts or heavy-duty fastening, a ratchet wrench improves efficiency.

Avoid over-tightening to prevent crushing the wood surface.

Anti-Loosening Tips for Carriage Bolts

To prevent loosening under vibration or long-term use, additional fastening components are recommended:

• Spring Washers: Add between the nut and material to increase friction.
• Lock Nuts (Nyloc Nuts): Provide a stronger anti-loosening effect.
• Double Nut Method: Using two nuts tightened against each other can also improve locking strength.

Why Choose Xinchi Fasteners for Carriage Bolts?

Choosing the right supplier is just as important as proper installation. Xinchi Fasteners offers multiple advantages:

• Strong Production Capacity: With 102 cold heading machines, our factory achieves a daily output of over 10 million pieces, ensuring a reliable, large-scale supply.
• Comprehensive Product Range: We manufacture a full range of carriage bolts, matching nuts, washers, and other fasteners to cover a diverse array of applications.
• Quality Assurance: Each batch follows strict QC procedures, with precise dimensions and consistent surface treatment.
• Customization Support: OEM/ODM services are available to meet your unique size, finish, and packaging requirements.
• Global Service: With years of export experience, Xinchi provides efficient logistics and professional support for international buyers.

XINCHI is a trustworthy fastener company, especially in furniture nuts. We have a factory,  founded in 2007. We are the designated fastener supplier to“STAPLE”. As a trusted fastener supplier, XINCHI offers a wide range of high-quality fasteners, including nuts, screws, bolts, rivets, and washers. If you would like to learn more about fasteners or are interested in wholesale fasteners, please do not hesitate to contact us. Our experienced and expert service team will reply as soon as possible.

With Xinchi Fasteners, you get not only high-quality carriage bolts but also a reliable long-term partner for all your fastening needs.