Expansion Anchor | High-Strength Mechanical Fastening for Concrete and Masonry
Product Overview
An Expansion Anchor is a mechanical fastener designed to create a secure, load-bearing connection in solid base materials such as concrete, masonry, and natural stone. It functions by expanding within a pre-drilled hole, generating substantial friction and mechanical interlock against the hole walls. This versatile and reliable anchoring method is fundamental to construction, manufacturing, and infrastructure projects, providing a robust solution for attaching structural and non-structural elements where pre-installed fixings are not available.
Key Advantages
High Load Capacity: Engineered to deliver reliable tensile (pull-out) and shear strength, suitable for a wide range of static and dynamic loads.
Immediate Load Transfer: Can be loaded immediately after correct installation, with no curing time required, unlike adhesive anchors.
Material Versatility: Effective in a variety of solid base materials, including cracked and uncracked concrete (subject to specific product approvals).
Simple & Verifiable Installation: Installation typically requires only standard drilling and torque tools. Correct setting is often visually or mechanically verifiable.
Durable & Predictable Performance: Made from high-strength materials with optional corrosion-resistant coatings, offering long-term, calculable performance.
Material Specifications & Grades
| Component | Standard Material | Common Grades/Treatments | Purpose |
|---|---|---|---|
| Bolt / Stud | Carbon Steel, Alloy Steel | Grade 5.8, 8.8, 10.9 (ISO 898-1); Quenched & Tempered | Provides core tensile strength and thread for clamping. |
| Expansion Sleeve/Clip | Steel, Stainless Steel | Case Hardened or Spring Steel | The element that deforms to create the holding force against the hole wall. |
| Nut & Washer | Carbon Steel, Stainless Steel | Matched to bolt grade | Completes the assembly, distributes load, and allows for tightening. |
Primary Types & Mechanisms
| Type | Common Name | Mechanism | Best For |
|---|---|---|---|
| Wedge Anchor | Heavy-Duty Wedge Anchor | A clip expands against concrete as the bolt is tightened. | Highest strength in solid concrete for structural connections (e.g., column bases, machinery). |
| Sleeve Anchor | Expansion Sleeve Anchor | A split sleeve expands as a cone is pulled into it by the nut. | Versatile, general-purpose anchoring in concrete, brick, and block. Adjustable for material thickness. |
| Drop-In Anchor | Strike Anchor | Internally expanded by driving a setting tool (pin). | Flush-mounted applications in concrete (e.g., securing bolt-down equipment to floors). |
| Hammer-Drive Anchor | Nail-In Anchor | Set by hammering a center pin, expanding the sleeve. | Rapid, light-duty fastening for fixtures like electrical conduit, pipe hangers. |
Performance Standards & Approvals
Expansion anchors for structural use are rigorously tested and certified to international standards:
Europe: ETA (European Technical Assessment) according to ETAG 001 guideline, allowing for CE marking and use in calculated applications in cracked or uncracked concrete.
North America: ICC-ES Evaluation Report demonstrating compliance with ACI 318 Appendix D and the International Building Code (IBC).
General Testing: Performance is validated through pull-out, shear, and seismic simulation tests.
Available Finishes & Corrosion Protection
| Finish Type | Specification | Protection Level & Application |
|---|---|---|
| Zinc Plated | ASTM B633 | Basic protection for indoor, dry environments. |
| Hot-Dip Galvanized (HDG) | ASTM A153 / ISO 1461 | Heavy-duty protection for outdoor, industrial, and coastal applications. |
| Stainless Steel | A2-304 / A4-316 | Excellent corrosion resistance for harsh chemical, marine, or high-hygiene environments. |
| Mechanical Galvanizing | ASTM B695 | Good corrosion resistance without hydrogen embrittlement risk for high-strength bolts. |
Quality Assurance & Traceability
Our expansion anchors are manufactured under a certified ISO 9001:2015 quality management system. We ensure:
Material Certification: Mill Test Certificates (MTC) for all steel components.
Dimensional & Mechanical Testing: Verification of thread fit, hardness, and proof load capacity.
Batch Traceability: Full documentation from raw material to finished product lot.
About Hebei Wohe Fastener Manufacturing Co., Ltd.
Hebei Wohe Fastener Manufacturing Co., Ltd. is a specialized producer of engineered fastening systems, including a comprehensive range of certified expansion anchors. Our manufacturing expertise encompasses precision cold forging, heat treatment, and strategic partnerships with certified coating specialists. We supply a global network of distributors and construction firms, providing not only products but also the technical data sheets, ETA reports, and installation guidance necessary for specifying and using these critical components safely and effectively in projects worldwide.
Ordering Information:
To Specify: Provide Anchor Type, Diameter, Length, Minimum Embedment Depth, Base Material, and Required Finish.
Packaging: Standard commercial packaging or custom project packaging available.
MOQ: Varies by product type; typically starts from 1,000 pieces for standard items.
Lead Time: Standard items: 20-25 working days. Custom/Certified items: 30-40 days.
Disclaimer: The selection and installation of expansion anchors for structural or overhead applications must be performed by a qualified professional in accordance with local building codes and the manufacturer’s instructions. Incorrect hole size, depth, or installation torque will compromise performance and safety.
