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6 Types of Bolts in Steel Structures

Bolts in Steel Structures

Bolts, one of the most crucial components of any steel structure, come in various sizes, shapes, and materials. Choosing the correct type of bolt for a steel structure is essential as it affects the overall strength and stability of the system. If you want to learn more about the types of bolts used in steel structures, you’ve come to the right place. In this blog post, we’ll take a closer look at the different types of bolts in steel structures and their applications.

Structural Bolts

Structural bolts are used in high load-bearing applications where a secure and robust connection is needed. These bolts come with a flat washer and a nut and are designed to withstand high tensile and shear forces. They also offer excellent resistance to vibrations. The head of a structural bolt is usually hexagonal or circular and is non-tamper-proof.

Anchor Bolts

Anchor bolts connect steel structures to concrete foundations. These bolts are usually embedded in the concrete and have a threaded end that protrudes above the surface. Anchor bolts come in various grades, sizes, and materials and are designed to resist shear and tensile forces.

A325 Bolts

The A325 bolt is a high-strength structural bolt commonly used in heavy construction projects. These bolts are made from medium carbon steel and are heat-treated to provide high tensile strength. Unlike other structural bolts, A325 bolts do not need a nut as they come with a built-in washer.

A490 Bolts

A490 bolts are similar to A325 bolts in strength but are made from a higher grade of steel. These bolts are used in heavy-duty applications like bridges, water towers, and high-rise buildings. A490 bolts have a yellow-coloured zinc coating and come in Type 1 and Type 3. Type 1 bolts are plain, while Type 3 bolts have a weathering steel coating.

A307 Bolts

Regarding industrial-strength fasteners, A307 bolts are a top choice for many professionals. These bolts are made from carbon steel and are designed to withstand high tension and stress levels. They come in various sizes and finishes, making them versatile and adaptable to many applications. If you need a fastener that won’t disappoint, A307 bolts are the way to go. As an expert, I highly recommend these durable and reliable bolts for all your industrial needs.

Eye Bolts

Eye bolts have a looped end and attach cables, wires, or chains to a steel structure. These bolts are typically used in lifting and rigging applications and come in various sizes and materials. The looped end of the bolt can be forged or welded depending on the application.


Choosing the correct type of bolt is crucial when constructing any steel structure. Each type of bolt has advantages and applications, and selecting the right one can make all the difference in safety and durability. By understanding the different types of bolts and their properties, you can make an informed decision for your next steel structure project.

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