Hot-Dip Galvanized Expansion Series | Structural Anchoring Solutions for Corrosive Environments
Product Overview
The Hot-Dip Galvanized (HDG) Expansion Series comprises a range of high-strength mechanical anchors engineered for permanent, load-bearing fastenings into concrete, masonry, and solid stone. Each anchor in this series integrates a reliable mechanical expansion mechanism with a thick, metallurgically bonded zinc coating applied via the hot-dip galvanizing process. This dual design philosophy ensures superior pull-out and shear strength alongside exceptional, long-term corrosion resistance, making it the definitive choice for critical structural and safety-related applications in exposed, humid, or chemically aggressive outdoor and industrial environments.
Key Advantages
Unmatched Corrosion Protection: The hot-dip galvanized coating (typically 55-100µm) acts as a robust sacrificial barrier, offering a service life decades longer than standard electroplated finishes. It is engineered for C4 (Highly Corrosive) to C5 (Very Highly Corrosive) atmospheric categories as per ISO 12944.
Immediate Load Capacity & Verification: Provides instant load-bearing capability after installation and torque verification, with no curing time required—unlike chemical anchors. Installation quality is visually and mechanically verifiable.
High Reliability in Concrete: Specific anchor types within the series are designed and tested to perform reliably in both uncracked and cracked concrete, in compliance with rigorous assessment guidelines such as ETAG 001.
Zero Hoop Stress Installation: Generates minimal stress during installation compared to some mechanical anchors, making it suitable for use in brittle materials or near edges when selected and installed correctly.
Proven Mechanical Principle: Offers predictable, consistent performance based on controlled expansion and friction, backed by calculable engineering data.
Series Components & Material Specifications
The series is defined by its high-integrity materials and finishes:
Anchor Body (Stud/Bolt): Manufactured from quenched and tempered medium carbon or alloy steel, achieving property classes 8.8 or 10.9 (ISO 898-1) for guaranteed tensile and shear strength.
Expansion Elements (Clips, Cones, Sleeves): Precision-formed from high-grade steel to ensure consistent, controlled expansion.
Hot-Dip Galvanizing Process: Fully compliant with ISO 1461 and ASTM A153. All high-strength components undergo mandatory post-galvanizing hydrogen embrittlement relief (baking) to eliminate the risk of stress cracking.
Complete Assembly Kits: Each anchor is supplied as a matched system, including the HDG anchor body, expansion element, hex nut, and hardened washer, ensuring optimal compatibility and performance.
Product Types within the Series
The series encompasses several anchor types to suit specific base materials and installation requirements:
| Type | Mechanism | Key Feature | Best For |
|---|---|---|---|
| Heavy-Duty Wedge Anchor | A clip expands against the hole wall as the bolt is tightened. | Highest single-unit pull-out strength in solid concrete. | Securing structural steel columns, machinery, and heavy fixtures to solid concrete foundations. |
| Sleeve (Expansion) Anchor | A split sleeve expands outward as a cone is drawn into it. | Adjustable for material thickness; good general-purpose hold. | Fastening rails, brackets, and equipment to concrete and solid masonry. |
| Strike (Drop-in) Anchor | Set by driving a steel pin, which expands the sleeve internally. | Ideal for blind-hole or overhead applications. | Securing pipe hangers, ceiling supports, or fixtures where bolt-tightening access is limited. |
| Undercut Anchor | Creates a mechanical interlock in a specially drilled undercut hole. | Extraordinary pull-out strength, excellent for thin slabs and dynamic loads. | Critical facade attachments, seismic applications, and scenarios with minimal edge distance. |
Performance Data & International Compliance
Load Values: Characteristic resistance values (tension & shear) for each anchor type and diameter are derived from testing per ETAG 001 (Europe) and ACI 318 Appendix D (USA), published in technical datasheets and approval reports.
Corrosion Resistance: The HDG coating typically provides >500 hours to first red rust in neutral salt spray testing (ASTM B117), translating to extended service life in real-world conditions.
Approvals & Reports: Products are developed to secure European Technical Assessment (ETA) for CE Marking under the Construction Products Regulation (CPR) and/or ICC-ES Evaluation Service Reports for the North American market.
Fire Resistance: Select anchors in the series are tested to maintain load capacity during fire exposure per relevant standards.
Surface Finish: The Hot-Dip Galvanized Advantage
The defining feature of this series is its finish. Hot-dip galvanizing provides:
Complete Coverage: Uniform coating over all surfaces, including threads and complex geometries of the expansion mechanism.
Metallurgical Bond: The zinc-iron alloy layers are integral to the steel, offering superior adhesion and abrasion resistance compared to electroplated coatings.
Cathodic Protection: Sacrificially protects the underlying steel at scratches or cut edges, preventing rust creep.
Typical Applications
Civil Infrastructure: Bridge parapets, highway signage & gantries, sound barrier walls, railway track fastenings.
Industrial & Energy: Securing structural steel, heavy machinery, pipe racks, and crane rails in chemical plants, refineries, power stations, and offshore structures.
Commercial Construction: Anchoring curtain wall systems, sunshades, and canopies to building facades.
Utilities & Marine: Streetlight poles, flood defense barriers, dock furniture, and harbor equipment in coastal zones.
Quality Assurance & Manufacturing
Every anchor in the HDG Expansion Series is produced under a certified ISO 9001:2015 quality management system. Our process ensures:
Full Traceability: From certified raw material to final galvanized product.
Rigorous Testing: Batch testing for coating thickness (per ISO 2178), adherence, mechanical properties, and dimensional accuracy.
Technical Documentation: Provision of comprehensive installation instructions, calculation software/data, and, where applicable, third-party approval documents (ETA/ICC-ES reports).
About Hebei Wohe Fastener Manufacturing Co., Ltd.
This series is supplied by Hebei Wohe Fastener Manufacturing Co., Ltd., a specialized manufacturer and exporter based in China’s premier fastener manufacturing hub. With over 15 years of expertise in structural fastening solutions, we partner with certified hot-dip galvanizing processors to deliver this high-performance product series. Our integrated supply chain management—from precision forging and machining to controlled galvanizing and final inspection—ensures that each anchor meets the severe demands of global infrastructure and industrial projects. We provide comprehensive technical support, from product selection to on-site installation guidance, serving engineering firms and contractors worldwide who require reliable, certified anchoring solutions for corrosive environments.
Ordering & Project Support:
To Specify: Please provide Anchor Type, Thread Diameter & Length, Minimum Embedment Depth, Concrete Strength Class, and Project Environmental Conditions.
Packaging: Individual kits or bulk project packaging available.
MOQ & Lead Time: Project-based. Standard items typically ship within 25-35 working days after order confirmation.
Critical Disclaimer: The selection, design, and installation of expansion anchors for structural applications must be performed by a qualified engineer in compliance with all local building codes and the product’s current technical approval documents (e.g., ETA). Strict adherence to the manufacturer’s published installation instructions regarding hole drilling, cleaning, and torque is absolutely essential for achieving the published load ratings and ensuring long-term safety.
