An expansion bolt is designed for applications where material must be securely attached to a fixed location, typically in concrete or other construction materials. The primary function of an expansion bolt is to create a secure and robust connection between the material and a specific mounting point.

The operation of an expansion bolt is as follows:

1. When not installed: The expansion bolt includes an internal washer or spacer cavity. When not installed, this bolt can be placed in an incomplete hole in the mounting material and fixing position.

2. Installation: As you twist the expansion bolt with the screw head, the inner washer will expand or "expand." This happens because there is a compression member inside the mattress, usually a fastener, that is pushed up by the tension from twisting the bolt. As the pin expands, it creates a convection pressure, squeezing the surrounding object (usually concrete) and creating a secure and tight bond.

Main Uses of Expansion Bolts:

1. Securing into Concrete: Expansion bolts are commonly used to secure materials into concrete, such as beams, bars, pipes, and other building structures.

2. Creating Strong Connections: Expansion bolts create a strong connection between the material and the concrete surface, ensuring that the structure or material being fastened does not shift from its position.

3. Applications in Construction and Industry: Expansion bolts are frequently employed in the construction and industrial sectors to securely attach components and equipment to concrete, brick, or other building materials.

In summary, expansion bolts are an essential tool in construction and industry, used to securely fasten materials to concrete or other building surfaces, creating a safe and robust connection.