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Expansion bolts

Expansion bolts, also known as expansion screws or expansion plug bolts, are a widely used fastener, especially suitable for fixing various equipment, brackets or pipelines on hard materials such as concrete, brick walls, rocks, etc. Its working principle is to generate an expansion force in the expansion pipe through the wedge-shaped slope of the bolt, so that a strong friction force is formed between the expansion pipe and the inner wall of the drilled hole, so as to firmly fix the bolt.
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    Structural composition

    Expansion bolts usually consist of the following parts:
    Bolt body: A threaded section that is used to screw in the expansion tube and create a wedge-shaped expansion force.
    Expanded tube: A tubular section with one or more cuts that expands radially to hold in place in the hole when the bolt is screwed in.
    Washers and nuts: used to connect bolts to the objects that need to be fixed and to apply preload.

    How it works

    When installing the expansion bolts, it is first necessary to drill a hole in the fixing body that matches the outer diameter of the expansion tube. The expansion tube is then placed into the hole and the bolt is screwed in. As the bolt is screwed in, the incut portion of the tube expands radially until a tight frictional contact is formed between the tube and the hole wall. At this point, by tightening the nuts and washers, enough preload is generated to hold the object in place.

    Features and Benefits

    Strong fixing force: The friction formed between the expansion bolt and the substrate is very large, which can provide a stable fixing effect.
    Easy installation: No special installation tools are required, just a regular screwdriver or wrench is required.
    Adaptable: Suitable for all kinds of hard materials, such as concrete, brick walls, rocks, etc.
    Reusable: The partial expansion bolt design allows for reinstallation after disassembly, improving efficiency of use.
    Fields of application
    Expansion bolts have a wide range of applications in a variety of fields, including but not limited to:
    Construction engineering: used to fix brackets, pipes, cable trays, etc.
    Machinery manufacturing: used to fix mechanical equipment, brackets and bases, etc.
    Power and energy: Used to secure equipment such as utility poles, transmission towers, and wind turbines.
    Transportation: used to fix bridges, tunnels and highway facilities, etc.
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