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Quick Guide on Carriage Bolts and Their Uses

Quick Guide on Carriage Bolts and Their Uses

Carriage bolts are a type of fastener that many people might not be familiar with by name, but they play a crucial role in construction, woodworking, and various DIY projects. These versatile bolts are known for their unique design and numerous applications. In this quick guide, we will explore what carriage bolts are, how to use them, and the various situations where they come in handy.

What Are Carriage Bolts?

Carriage Bolts, also known as coach bolts or round head square neck bolts, are a type of threaded fastener. They are characterized by their distinctive features:

1. Round Head: The head of a carriage bolt is round or domed, which makes it stand out from other types of bolts with flat or hexagonal heads.

2. Square Neck: Carriage bolts have a square section directly under the head. This square neck fits into a square hole in the material being fastened, preventing the bolt from turning when you tighten the nut.

3. Threaded Shaft: The shaft of a carriage bolt is fully threaded from the head to the tip.

4. Smooth Shank: The shank below the square neck is smooth, which helps the bolt pull into the material securely.

 How to Use Carriage Bolts?

Using carriage bolts is relatively straightforward, but there are specific steps to ensure they function correctly:

1. Drill Holes: First, you need to drill holes in the materials you want to fasten together. The hole diameter should match the size of the carriage bolt.

2. Insert the Bolt: Place the carriage bolt through the hole from the side where you want the square neck to be. The square neck will prevent the bolt from rotating.

3. Add Washers: You can add washers under the bolt head and the nut to distribute the pressure evenly and protect the material surface.

4. Tighten the Nut: Secure the carriage bolt by tightening the nut on the other side of the material. Make sure it’s snug but not overly tight, as over-tightening can damage the materials.

5. Cut or File Excess: If the bolt sticks out too far, you can cut off the excess thread with a hacksaw or file it down to the desired length.

Common Uses of Carriage Bolts:

Carriage bolts are versatile fasteners and are used in a variety of applications:

1. Woodworking: Carriage bolts are often used to attach parts of wooden structures, like building decks, playsets, or fences. The square neck keeps them securely in place while the smooth shank ensures a clean appearance.

2. Metalworking: They can be used to fasten metal plates, angle brackets, and other metal components.

3. Vehicle Assembly: Carriage bolts are employed in the assembly of vehicles, especially in securing suspension components and frame connections.

4. Outdoor Structures: From swing sets to garden gates, carriage bolts are ideal for outdoor structures because of their resistance to weathering.

5. Machinery: In machinery and equipment manufacturing, they are used to secure moving parts and frame elements.

6. Furniture Assembly: Carriage bolts are commonly used in assembling furniture, particularly when a flush and smooth finish is desired.

7. Playground Equipment: Swing sets, slides, and climbing structures are often held together with carriage bolts because of their strength and durability.

8. Boat Building: In marine applications, where corrosion resistance is crucial, carriage bolts made of stainless steel are used to fasten various components.


Carriage bolts are an essential part of the fastener family, serving various industries and DIY enthusiasts. Their unique design, which combines a smooth shank, square neck, and round head, makes them reliable for securing materials and creating a polished appearance. Whether you are working on a construction project, woodworking, or machinery assembly, carriage bolts are a reliable choice to ensure stability and longevity. So, the next time you embark on a project, consider using carriage bolts for a secure and professional finish.

Bhansali Metalloys Inc is one of the leading Manufacturer, Exporters, and Suppliers of High Quality Carriage Bolts  all over in India. We are Manufacturer, Supplier and Dealer of various types of Fasteners such as Bolts, Nuts, Screws, Washers, Threaded Rods and many more. We are SS Carriage Bolts Manufacturer in India. These Bars are available in different grades and materials. We are Stainless Steel Carriage Bolts Manufacturer, Supplier, Dealer, and Exporter in India. We are Carriage Bolts Supplier in India. Contact Us +919152160158 or email to for Carriage Bolts price list.

For our full list of products that we offer check out our website here. Be sure to join the conversation in our Facebook, Instagram, Twitter, LinkedIn Group.

Each Stainless Steel Carriage Bolts is otherwise designed based on the characteristics of the applying and additionally the pressure. Consequently, different industries use different SS Carriage Bolts. We also produce customized Carriage Bolts Products at our factory as per our client’s requirements. For any types of Carriage Bolts Price List Call on +91 9152160158 or drop an Email to |

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