Self-Cutting Undercut Anchor Bolt

Undercut Anchor? Wanluo's Self-Cutting Undercut Anchor Bolt are upgraded high-efficiency mechanical undercut anchors, optimized on the basis of traditional back cut anchors and wedge anchors. Unlike conventional undercut anchors that require professional reaming bits for secondary hole expansion, this self-cutting mechanical anchor integrates a high-hardness cutting tooth structure on the expansion sleeve.

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Product Description

The Self-Cutting Undercut Anchor Bolt produced by Wanluo supplier can automatically cut and form a standard undercut counterbore inside the concrete and stone base during installation, realizing one-hole drilling and one-step locking. Adopting pure mechanical rigid interlock principle with zero expansion stress, it avoids substrate cracking caused by extrusion force. Featuring tool-free reaming, fast installation and ultra-high anchoring safety, it is widely used in engineering renovation, curtain wall fixing, equipment anchoring and various high-reliability building fastening scenarios.

Precautions

The Self-Cutting Undercut Anchor Bolt adopts integrated high-precision forging and CNC machining, composed of high-hardness self-cutting expansion sleeve, high-strength threaded rod, precision flat washer and hexagonal locking nut. The unique integral cutting tooth structure is quenched and hardened as a whole, with strong cutting and chiseling ability, which can quickly trim the hole wall and form a standardized undercut groove matching the anchor body without special reaming tools. The split expansion sleeve opens synchronously during tightening, achieving full-circle close fitting and mechanical biting with the self-cut counterbore, forming a permanent rigid lock structure. The rolled dense standard thread ensures uniform stress and stable locking without slipping. Made of high-purity stainless steel and high-grade carbon steel with strict mechanical property testing, the product boasts high tensile strength, strong shear resistance and excellent fatigue resistance, maintaining stable anchoring performance under long-term vibration, wind pressure and alternating load.

Product Parameter

Parameter Item	Detailed Specification
Product Name	Self-Cutting Undercut Anchor, One-Piece Mechanical Anchor, Self-Reaming Underwall Anchor
Executive Standard	DIN Standard, ISO Standard, Building Mechanical Anchor GB Standard, Custom Non-Standard
Available Material	304, 316L Stainless Steel, 8.8/10.9 Grade High-Strength Carbon Steel
Size Range	M6-M20 full standard sizes, customized anchor length and special cutting tooth specification
Structure Type	Self-cutting tooth integrated structure, automatic undercut forming, zero-stress mechanical interlock
Processing Technology	Precision forging, tooth surface hardening treatment, thread rolling, integral toughening, deburring finishing
Applicable Base Material	Solid concrete, hard stone, marble, granite, brick wall and other rigid substrates
Surface Treatment	Pickling & passivation / Hot-dip galvanized / Electric galvanized / Black oxidation
Mechanical Properties	Self-reaming & self-forming, ultra-high tensile & shear strength, anti-vibration, crack-proof, permanent locking
Packaging Method	Moisture-proof inner bag + export carton, pallet packing for bulk engineering orders
Supply Service	Spot bulk supply, engineering custom processing, one-stop mechanical anchor fastener procurement

Self Cutting Undercut Anchor

Screw Thread d	M10 18×60	M10 18×100	M12 18×80	M12 18×100	M12 18×120	M12 18×150	M12 22×80	M12 22×100	M12 22×120	M12 22×150	M16 22×130	M16 22×150	M16 22×180
Borehole diameter	18	18	18	18	18	18	22	22	22	22	22	22	22
Effective burial depth	60	100	80	100	120	150	80	100	120	150	130	150	180
Drilling depth	80	120	100	120	140	170	100	120	140	170	150	170	200
Bolt length	110	150	130	150	170	200	130	150	170	200	190	210	240

Screw Thread d	M16 22×200	M16 28×130	M16 28×150	M16 28×180	M16 28×200	M20 28×150	M20 28×180	M20 28×210	M20 28×250	M20 28×280	M20 35×150	M20 35×180	M20 35×210
Borehole diameter	22	28	28	28	28	28	28	28	28	28	35	35	35
Effective burial depth	200	130	150	180	200	150	180	210	250	280	150	180	210
Drlling depth	220	150	170	200	220	170	200	230	270	300	170	200	230
Bolt length	260	190	210	240	260	230	260	290	330	360	230	260	290

Screw Thread d	M20 35×250	M20 35×280	M24 32×200	M24 32×250	M24 32×300	M24 32×350	M24 38×200	M24 38×250	M24 38×300	M24 38×350	M30 38×350	M30 38×450
Borehole diameter	35	35	32	32	32	32	38	38	38	38	38	38
Effective burial depth	250	280	200	250	300	350	200	250	300	350	350	450
Drilng depth	270	300	220	270	320	370	220	270	320	370	370	470
Bolt length	330	360	300	350	400	450	300	350	400	450	470	570

Product Manufacturing Process

1. Innovative self-cutting integrated structure eliminates the need for professional undercut reaming bits. The anchor itself can complete hole wall trimming and counterbore forming in one step, greatly reducing construction tool cost and improving on-site installation efficiency.

2. Pure mechanical rigid interlock principle with zero expansion stress during installation, effectively preventing cracking and damage of brittle substrates such as stone and concrete. It solves the pain points of traditional expansion anchors and ordinary back cut anchors in complex construction scenarios.

3. High-hardness quenched cutting teeth ensure precise and standardized undercut forming. The full-circle fitting mechanical bite structure provides higher pull-out resistance and shear strength than ordinary friction anchors, with stronger overall structural stability.

4. Simplified installation process, no secondary hole processing and glue curing required. Self-Cutting Undercut Anchor Bolt can be locked and loaded immediately after installation, adapting to rapid construction and emergency anchoring projects, and reducing overall engineering cycle.

5. Diversified material and anti-corrosion treatments adapt to indoor decoration, outdoor engineering, coastal corrosive environments and high-altitude building facilities, widely used in curtain wall installation, mechanical equipment fixing, pipeline support, building renovation and heavy-load anchoring projects.

Self Cutting Undercut Anchor

FAQ

Q1: What is the difference between self-cutting undercut anchors and ordinary back cut anchors?

A1: Traditional back cut anchors require special reaming tools for secondary hole expansion; self-cutting undercut anchors have built-in cutting teeth, which can self-ream and form undercut holes without professional bits. They feature faster installation, lower construction cost and more flexible operation, while retaining zero-stress mechanical locking advantages.

Q2: Is the locking strength of self-cutting mechanical anchors reliable?

A2: Absolutely reliable. After self-cut forming, the anchor forms a full-circle rigid interlock with the substrate, with tensile and shear strength far exceeding ordinary wedge expansion anchors. It can withstand long-term wind pressure, vibration and alternating load, meeting national building engineering safety standards.

Q3: What base materials are not suitable for this anchor?

A3: It is suitable for solid and rigid substrates such as solid concrete, granite and hard brick walls. It is not recommended for hollow bricks, foam concrete, loose and soft substrates to avoid insufficient cutting forming and locking force failure.

Q4: Is it reusable after disassembly?

A4: Self-cutting undercut anchors belong to permanent mechanical locking fasteners. The self-reamed counterbore is formed irreversibly, so they are not suitable for repeated disassembly and reuse, ensuring long-term anchoring safety of engineering structures.

Q5: Can customized specifications be provided for special engineering?

A5: Yes. We support customizing non-standard lengths, thickened reinforced bodies, enhanced cutting teeth and special anti-corrosion surface treatments to meet personalized heavy-load and special environment anchoring requirements.

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