Undercut Concrete Expansion Anchor Bolt

Through professional drilling and hole bottom reaming construction, the Undercut Concrete Expansion Anchor Bolt supplied by Wanluo factory expands and clamps tightly with the concrete hole wall, forming a permanent mechanical interlocking structure. It features ultra-high pull-out resistance, no expansion gap, no displacement and stable load-bearing performance. It is a safety-grade anchoring solution widely used in building renovation, curtain wall installation, mechanical equipment fixing and infrastructure engineering.

Precision Machining Technology & High-Strength Material Forming Craft

This Undercut Concrete Expansion Anchor Bolt is made of high-quality carbon steel or stainless steel raw materials, processed through integral precision turning and thread rolling forming. The expansion sleeve adopts integrated slotted cutting design with uniform stress and flexible expansion, which can perfectly fit the reamed hole bottom without slipping or empty expansion. The standard precision thread ensures smooth meshing and uniform locking force. The whole bolt body undergoes strict quenching and tempering heat treatment to improve overall hardness and tensile strength, effectively resisting tensile load and shear force. The surface is treated with electro galvanizing, hot-dip galvanizing or Dacromet anti-corrosion process, which greatly enhances rust resistance, aging resistance and environmental adaptability, meeting long-term outdoor engineering and humid environment use standards.

Product Parameter

Structural Anchoring Strength & Construction Engineering Application Values

1. Physical mechanical locking, safer and more stable. Different from traditional friction expansion bolts, post undercut anchors form rigid interlocking with concrete hole walls after reaming and expansion. It avoids the risk of loose anchoring caused by friction attenuation, with ultra-high tensile and shear resistance, meeting building safety load standards.

2. No gap expansion & no base damage. The bottom expansion design will not cause surface extrusion crack or base deformation of concrete. It protects the integrity of the building base, suitable for high-standard construction and renovation projects with strict requirements on wall structure.

3. Excellent anti-vibration and fatigue resistance. The integrated mechanical self-locking structure can resist long-term mechanical vibration, wind load and temperature alternating changes. It will not loose or displace during long-term service, realizing permanent fixed anchoring effect.

4. Wide environmental and structural adaptability. With diversified anti-corrosion treatments, the anchor bolt can adapt to indoor dry environment, outdoor open air, coastal humid and high-salt corrosion environment. It is compatible with various hard concrete and stone base materials.

5. Standardized construction & high project compatibility. Mature construction process, simple and efficient installation, suitable for large-scale engineering batch operation. Widely recognized in construction, municipal, mechanical and curtain wall engineering fields, with stable batch quality and high cost performance.

FAQ

Q1: What is the difference between mechanical undercut anchors and ordinary expansion bolts? 

A1: Ordinary expansion bolts rely on friction force for fixing, which is easy to loosen after vibration; post expansion mechanical anchors adopt physical hole-bottom locking, with stronger bearing capacity, higher safety and no loosening risk, belonging to structural safety anchor parts.

Q2: What base materials are suitable for this anchor bolt? 

A2: It is mainly applicable to solid concrete, dense stone and other rigid base materials. It is widely used for building structural fixing and equipment anchoring, not suitable for hollow and loose wall bases.

Q3: Is this anchor bolt suitable for outdoor engineering? 

A3: Yes. Equipped with hot-dip galvanizing and Dacromet anti-corrosion processes, it has excellent weather resistance and corrosion resistance, which can adapt to long-term outdoor exposure and harsh environmental conditions.

Q4: Can it bear heavy equipment load? 

A4: Absolutely. The mechanical interlocking structure provides super tensile and shear strength, fully meeting the heavy-load anchoring requirements of mechanical equipment, curtain wall structures and engineering supports.

Q5: Support engineering customized specifications? 

A5: We support full-size customization and special process treatment, and can provide official test reports and qualification documents to meet engineering bidding and construction acceptance standards.