Wedge Anchor Concrete Expansion Anchor

Wedge Anchor Concrete Expansion Anchor

(also known as expansion anchor bolt or wedge anchor) is a high performance mechanical fastening device specifically developed for use in cracked and uncracked concrete and solid masonry substrates. It derives its holding power by virtue of a tight tolerance expansion mechanism. As the bolt is tightened, the conical wedge at the bottom of the bolt is pulled up, causing the split collar or expansion sleeve of the anchor to press tightly against the walls of the pre-drilled hole, creating an extremely tight interlock, resistant to vibrations, and in fact, increases in strength as the load increases.

Key Features of Wedge Anchor Concrete Expansion Anchors

In every important way, our Wedge Anchor products beat mechanical attaching:

• Instant full load-bearing. The anchor reaches its rated tensile and shear values without cure or adhesive waiting when installed and torqued to specification.
• The expansion mechanism was checked. To maintain expansion force between batches, the split expansion collar and tapered wedge are machined to close tolerances.
• Pull-resistant concrete anchor. The expansion design maximises the anchor body's contact with the concrete hole wall, boosting pull-out resistance over generic sleeve anchors.
• Shock- and vibration-resistant. Dynamics-resistant mechanical interlock anchors are appropriate for equipment subject to vibration, seismic activity, or cyclic loading.
• Available in multiple finishes. Standard zinc plating indoors, hot-dip galvanising outdoors and corrosives, and stainless steel (304/316) for chemical, marine, and food-processing industries.
• Flexible threads. Hex flange, reduced washer head, UNC, metric, and BSW threads; full- and partial-thread.
• Choice of embedding depth. Engineers can use conventional and reduced embedment variations to choose anchors for concrete thickness and load.

Workings of Wedge Anchor Expansion

A Concrete Expansion Anchor works by controlled axial displacement creating radial expansion pressure. The four-step installation process:

• Drill a concrete or masonry hole to the anchor size's diameter and depth. The hole must be dust-free for optimal expansion contact.
• Insert the anchor body through the fixture (if pre-assembled) or drilled hole until the washer and nut are on the mounting surface.
• Use a calibrated torque wrench to provide the nut's installation torque. The tapered wedge rises into the split collar as the nut tightens.
• Expand, lock. Wedge upward forces split collar outward against hole wall. Permanent, vibration-dampening mechanical locks result from friction and interference fit.

Never lower the embedment depth below the manufacturer's minimum. Insufficient embedment greatly lowers pull-out and shear capability, can cause anchor failure under load.

Product Specifications

Industry Applications

The combination of high load capacity, immediate usability, and proven expansion mechanics makes Wedge Anchor products suitable across a broad range of structural and non-structural fixing applications:

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