Concrete Anchors

Structural Supports

Undercut Concrete Anchors

Undercut anchors are specially designed for high-performance applications in concrete, ensuring a secure and reliable connection. Unlike traditional expansion anchors, undercut anchors create a mechanical interlock within the concrete, delivering exceptional load-bearing capacity and long-term stability

Advantages of Undercut Anchors

Superior holding power due to mechanical interlock
Suitable for high-load and safety-critical applications
Excellent performance in both cracked and non-cracked concrete
Reduced risk of concrete splitting or failure
Seismically rated for the toughest of environments

Undercut anchors are ideal for structural steel connections, façade systems, heavy-duty machinery installations, and seismic applications. Their high performance makes them a dependable solution for demanding construction environments.

How Do Undercut Anchors Work?

The Liebig Ultraplus uses a special undercutting tool to form a void at the bottom of the drilled hole. When inserted, its spring-loaded mechanism forces expansion keys into the void, creating a secure interlock. This ensures maximum load capacity, utilising the anchor’s steel strength rather than relying on concrete friction.

Undercut Anchor Installation Methods

Pre-Drilling: Liebig Anchors Self Under-cut
Self-Undercutting (Rotary): A stop drill forms a hole, and the anchor’s cutting teeth expand the undercut as it spins
Self-Undercutting (Percussion): A hammer drill drives the anchor, cutting the undercut shape as it installs.

Why Choose Undercut Anchors?

Unmatched Strength – Superior load resistance
Secure & Reliable – Ideal for cracked and non-cracked concrete
Structural Protection – Reduces stress on concrete
Edge Distance Safety – Removes risk of cracking

Key Considerations: Undercut Anchors

To ensure optimal performance and safety, several factors must be considered:

Concrete Strength – Cracked concrete requires anchors with high resistance to movement and stress, whereas non-cracked concrete doesn’t.
Anchor Spacing & Edge Distance – Ensure load distribution to prevent premature failure. Insufficient spacing can weaken the concrete.
Load Value & Angle – The magnitude and direction of applied forces (tension, shear) influence the anchor and installation choice.
Environmental Conditions – Exposure to moisture, chemicals, or extreme temperatures can affect the durability and corrosion resistance of the anchor.

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