Types of Expansion Bolts: Detailed guide from installation to application

Expansion bolts are designed to create a secure connection by expanding within a pre-drilled hole in the substrate.  When the bolt is inserted and tightened, the expansion mechanism spreads outward, gripping the sides of the hole and providing a stable anchor.   This allows the bolt to support significant loads and resist pulling or shearing forces.

 

Types of Expansion Bolts

1.  Wedge Anchor Bolts
Wedge anchor bolts consist of a bolt with a conical-shaped end and a nut and washer.  The wedge-shaped design provides a strong and reliable connection. When the bolt is tightened, the expansion sleeve expands outwards and fits tightly into the hole wall. They are suitable for both indoor and outdoor applications and can be used in a variety of substrates, including concrete, brick, and stone.

2.  Sleeve Anchor Bolts
Sleeve anchor bolts have a cylindrical sleeve that expands when the bolt is tightened. During installation, tightening the bolts causes the casing to expand, creating a firm grip in the hole. The sleeve is typically made of metal or plastic and is designed to deform and grip the hole walls. They are commonly used in applications where a flush-mounted or concealed fastener is required.  They are often used in the installation of electrical boxes, plumbing fixtures, and curtain walls.

3.  Drop-In Anchor Bolts
Drop-in anchor bolts are designed for use in concrete and masonry applications. They consist of a shell with internal threads and a plug.  During installation, tightening the bolts causes the casing to expand, creating a firm grip in the hole. They are suitable for high-load applications and can be used in both vertical and horizontal installations.  Drop-in anchor bolts are often used in applications where the bolt head needs to be flush with the surface.   Common applications of drop-in anchor bolts include securing heavy machinery, structural steel, and overhead cranes to concrete floors and walls.  They are also used in the installation of elevator rails and conveyor systems.

4. Chemical Anchor Bolts
Chemical anchor bolts use a chemical adhesive to bond the bolt to the substrate. The bolt is inserted into a pre-drilled hole, and a two-part epoxy or resin adhesive is injected into the hole.  The adhesive cures over time, creating a strong and durable bond between the bolt and the substrate.  Chemical anchor bolts offer high load-bearing capacity and excellent resistance to corrosion and seismic forces.  They are suitable for use in a variety of substrates, including concrete, brick, and stone.  Chemical anchor bolts can be used in applications where traditional mechanical anchors are not suitable, such as in cracked or deteriorated concrete.

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