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Hefei SENOTECH New Materials Co., Ltd is proud to present our Stainless Steel 304 Concrete Expansion Bolt – a premium fastening solution engineered for demanding construction and industrial environments. As a dedicated trading company with annual export value exceeding USD 1 million, we source and supply only the highest quality products that meet rigorous international standards. Our expansion bolts are ETA approved, ensuring full compliance with European technical assessments for safety and reliability. With full size availability (M6 to M20) and exceptional hardness, these bolts deliver secure anchoring in concrete, brick, and stone bases, making them ideal for structural, mechanical, and safety-critical applications across global markets including North America, Europe, Southeast Asia, and Oceania.
Every bolt is manufactured from premium Stainless Steel 304, known for its outstanding corrosion resistance, durability, and strength. The high hardness treatment further enhances the bolt’s load-bearing capacity and resistance to wear, ensuring long-term performance even in outdoor or humid conditions. Whether you need a reliable anchor for handrails, machinery, shelving, or facade systems, our expansion bolts provide consistent clamping force and easy installation.
Our company, established in 2020, has quickly built a strong reputation for supplying high-quality fasteners to clients worldwide. We maintain strict quality control procedures, and our ETA certification underscores our commitment to product excellence. Below we detail the key features, technical specifications, and benefits that make our stainless steel expansion bolts a superior choice for your projects.
Key Features & Benefits
- Stainless Steel 304 Material: Provides excellent resistance to rust, oxidation, and many chemicals. Suitable for indoor and outdoor use, including near coastal areas.
- ETA Approved: Conforms to European Technical Assessment standards, giving you confidence in performance and safety.
- Full Size Range: Available from M6, M8, M10, M12, M16, to M20, covering most common anchoring requirements.
- High Hardness: Enhanced hardness (≥ HRB 70) ensures the bolt resists deformation and provides strong, reliable clamping under heavy loads.
- Easy Installation: Pre-assembled with nut and washer; simply drill a hole, insert the bolt, and tighten. No special tools needed.
- Consistent Expansion: Precision-cut cone and expansion sleeve ensure uniform expansion for maximum holding strength.
- Versatile Applications: Ideal for concrete, solid brick, natural stone, and hollow block bases.
- Low Maintenance: Corrosion-resistant finish reduces need for frequent inspection or replacement, lowering long-term costs.
Technical Specifications
| Parameter | Value / Range |
|---|---|
| Material Grade | 304 Stainless Steel (A2) |
| Diameter Range | M6 – M20 |
| Length Options | 25 mm – 200 mm (customizable upon request) |
| Hardness (Rockwell B) | ≥ 70 HRB |
| Tensile Strength | ≥ 700 N/mm² (approx.) |
| Operating Temperature | -40°C to 80°C |
| Approval | ETA (European Technical Assessment) – available per batch |
| Surface Finish | Bright or mill finish as standard |
Product Details
Our Stainless Steel 304 Concrete Expansion Bolt is designed for secure anchorage in concrete bases with compressive strength up to C30/C40. The bolt consists of a stud, expansion clip, nut, and flat washer, all made from 304 stainless steel. When the nut is tightened, the cone at the end of the stud forces the expansion clip to expand outward, pressing tightly against the concrete, creating a mechanical interlock. This design delivers high load capacity and vibration resistance.
The full-size availability allows you to choose the exact diameter and length needed for your project, reducing waste and ensuring optimal performance. The high hardness of the material (≥ 70 HRB) comes from precise heat treatment, which not only improves strength but also reduces the risk of thread galling during installation.
These expansion bolts are perfect for anchoring structural steel, brackets, handrails, cable trays, heavy machinery, and equipment to concrete floors and walls. Their corrosion resistance makes them suitable for environments exposed to moisture, such as swimming pools, marine applications, wastewater treatment plants, and food processing facilities.
Installation is straightforward:
- Drill a hole of the specified diameter and depth in the concrete base.
- Clean the hole of dust and debris.
- Insert the expansion bolt with the nut and washer loosely attached.
- Use a torque wrench to tighten the nut to the recommended torque value (provided with the product).
- Check that the bolt is firmly seated and the expansion is complete.
Our bolts are pre-assembled for convenience, and each batch comes with a test certificate confirming ETA compliance upon request.
Why Choose Hefei SENOTECH New Materials Co., Ltd?
Since our establishment in 2020, we have focused on delivering reliable fastening solutions to a global clientele. With an annual export value of USD 1 million to USD 1.5 million, we have successfully supplied products to more than 15 countries across North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Middle East, East Asia, Western Europe, Central America, Northern Europe, Southern Europe, and South Asia. Our experienced team ensures that every shipment meets the required standards and is packed securely for international transport.
We understand that trust is built on product quality and after-sales support. Therefore, we offer:
- Full traceability of batches with material test reports and ETA documentation.
- Flexible packaging: bulk, poly bags, boxes, or custom branded packaging per your request.
- Competitive pricing without compromising on quality.
- Fast response for inquiries, samples, and technical support.
Our commitment to continuous improvement and customer satisfaction makes us a preferred partner for construction companies, distributors, and OEMs worldwide. When you choose our Stainless Steel 304 Concrete Expansion Bolt ETA Approved Full Sizes High Hardness, you are investing in a product that delivers safety, longevity, and value. Contact us today for a quote, sample, or technical specifications. We look forward to supporting your next project.
Frequently Asked Questions (FAQ)
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Q1: What does ETA approval mean for your expansion bolts?
ETA (European Technical Assessment) confirms that our expansion bolts meet the performance requirements defined in European Assessment Documents. It provides assurance of load capacity, safety, and reliability for use in construction projects across Europe and other regions that recognize ETA standards. -
Q2: Are these bolts suitable for outdoor use in coastal areas?
Yes. Stainless Steel 304 offers good resistance to salt spray and humidity, making it suitable for coastal environments. For extremely aggressive conditions (e.g., underwater or high chloride), we recommend evaluating 316 stainless steel, which is also available upon request. -
Q3: What is the temperature range for these bolts?
The recommended operating temperature is -40°C to +80°C. For higher-temperature applications, please consult our technical team for specialized options. -
Q4: Do you provide technical datasheets or installation guides?
Yes. We supply product datasheets with torque values, edge distances, and installation instructions. ETA certificates are available upon request for each batch. -
Q5: Can I get samples before placing a bulk order?
Absolutely. We offer free samples for evaluation (customer pays shipping). Please contact us with your required size and quantity. -
Q6: Are custom lengths or diameters available?
While we stock full sizes from M6 to M20 in standard lengths, custom lengths can be produced with a reasonable MOQ. Contact our sales team for details. -
Q7: How is the high hardness achieved? Does it affect corrosion resistance?
High hardness is achieved through controlled heat treatment (solution annealing and quenching). This process maintains the corrosion resistance of 304 stainless steel. Even with increased hardness, the material remains highly resistant to rust and chemical attack. -
Q8: What packaging options do you offer for export?
We pack bolts in strong poly bags, then in cartons, or as requested by the customer. For sea freight, we use pallets with shrink wrap to ensure safe transportation. Custom packaging with your branding is available.
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