ThePipingMart Blog Fasteners 5 Types of Carriage Bolts and Their Uses

5 Types of Carriage Bolts and Their Uses

Carriage Bolts

Carriage bolts have been widely used in construction and engineering because of their reliability and convenience. These bolts are designed to fasten wood and metal together and can be used for various applications, from setting up a fence to assembling heavy machinery. However, not all carriage bolts are created equal. In this article, we’ll explore the different types of carriage bolts available in the market and help you understand their unique features and functions.

Types of Carriage Bolts

Roundhead and Rib-Necked Bolts

Roundhead and rib-necked bolts are the most commonly used carriage bolts for woodworking. They are characterized by their round heads and necks with shallow grooves, providing greater resistance to pull-out forces. These bolts can be easily installed using a wrench or pliers, making them an ideal choice for DIYers and professionals. Thanks to their ribbed necks, these bolts can be safely used in areas that experience high vibrations without loosening over time. Roundhead and rib-necked carriage bolts come in various sizes, making them versatile and suitable for different projects.

Roundhead and Short-Necked Bolts

Roundhead and short-necked bolts, also known as mushroom head bolts, are designed to sit flush with the workpiece, creating a seamless look. They have a shorter neck than rib-necked bolts, making them more suitable for thinner materials, where longer necks may damage or penetrate the surface. Roundhead and short-necked bolts can be used in woodworking, automotive, and electrical applications where a decorative finish is preferred. They are easy to install, require minimal maintenance, and offer excellent holding strength.

Flathead and Square-Necked Bolts

Flathead and square-necked bolts are commonly used in metal-work applications and are characterized by their flat heads and square necks. These bolts are designed to sit flush with the material’s surface and are ideal for use in structural engineering, where a secure and permanent connection is required. Because they can distribute forces evenly, flathead and square-necked bolts can endure high-stress environments without failing. They are commonly used with nuts to create a secure fastening point that won’t slip or loosen over time.

Fin-Necked Bolts

Fin-necked bolts, also known as security bolts, are designed with an anti-tamper feature that provides additional protection against theft and vandalism. These bolts have fins on the neck that prevent them from being removed or loosened using common tools. Fin-necked bolts are used in high-security applications such as prison gates, electrical cabinets and machinery. They are ideal for outdoor use, exposed to harsh weather conditions. While they offer enhanced security features, fin-neck bolts can be challenging to install and require specialized tools.


Carriage bolts are an essential component of any construction or engineering project. By understanding the different types of carriage bolts available on the market, you can confidently choose the right product for your needs. Whether you’re replacing old bolts or installing new ones, consider factors such as the type of material you’re working with, the environment in which the bolts will be used, and the level of security required. With the proper knowledge and skills, you can install carriage bolts that provide reliable and long-lasting performance.

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