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Help Center304 Stainless Steel Expansion Bolt for Infrastructure Projects High Hardness ETA Approved Full Sizes Available Free Samples
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Welcome to Hefei SENOTECH New Materials Co., Ltd – your reliable partner for high-grade fastening solutions. Our 304 Stainless Steel Expansion Bolt is specifically engineered for demanding infrastructure projects where durability and safety are non-negotiable. Featuring high hardness and full ETA approval, this expansion bolt delivers consistent performance under heavy loads and harsh environments. We offer full size availability from M6 to M24 and provide free samples for your evaluation, ensuring you get the right fit for every application.
Key Features & Technical Specifications
- Material Excellence: Made from premium 304 stainless steel, offering superior corrosion resistance against moisture, chemicals, and UV exposure – ideal for outdoor and underground infrastructure.
- High Hardness Performance: Through controlled heat treatment, the bolt achieves a hardness of ≥HRC 35, ensuring it can withstand high tension and shear forces without deformation.
- ETA Approved: The product carries European Technical Assessment (ETA) certification, confirming compliance with strict European standards for structural fasteners in concrete. This approval is critical for projects requiring regulatory validation.
- Full Size Availability: Available in diameters M6, M8, M10, M12, M16, M20, and M24, with corresponding lengths from 50mm to 300mm. Custom lengths can be produced upon request.
- Easy Installation: Designed with a wedge expansion mechanism – simply drill a hole, insert the bolt, and tighten. The expansion sleeve secures firmly in concrete, reducing installation time by up to 30% compared to traditional anchors.
- Free Samples & Customization: We offer free samples for quality verification. Additional surface treatments (e.g., sandblasting, passivation) or special packaging are available as options.
| Parameter | Value |
|---|---|
| Material | 304 Stainless Steel (A2-70) |
| Hardness | HRC 35-40 |
| Thread Standard | DIN 934 / ISO 4032 |
| Pull-out Load (M12 in C20/25 concrete) | ≥ 25 kN |
| Operating Temperature | -40°C to +80°C |
| Approval | ETA (European Technical Assessment) – Option 1 for cracked concrete |
Why Choose Our Expansion Bolt for Infrastructure Projects?
- Long-term Reliability: 304 stainless steel eliminates rust and galvanic corrosion, ensuring 50+ years of service life in normal environments – a crucial factor for bridges, tunnels, and rail systems.
- Compliance with Global Standards: Our bolts meet or exceed the requirements of ASTM F593, DIN 933, and European ETAG 001. The ETA mark guarantees traceability and quality consistency.
- Cost Efficiency: By offering full sizes with competitive pricing and free samples, we help clients validate performance before bulk orders, reducing project risk.
- Versatility: Suitable for both cracked and non-cracked concrete, this bolt can be used in seismic zones, high-vibration areas, and heavy machinery anchoring.
Trusted by Global Markets
Hefei SENOTECH New Materials Co., Ltd, established in 2020, has rapidly grown into a trusted exporter serving North America, South America, Europe, Southeast Asia, Africa, Oceania, and the Middle East. With an annual export value of US$1 million – US$1.5 million, we are committed to delivering quality products backed by rigorous inspection. Each batch of expansion bolts undergoes dimensional, hardness, and tensile testing to ensure 100% compliance. Our free sample program allows you to test our product in your specific application – contact us today for a sample and discover the difference in performance and service.
Frequently Asked Questions (FAQ)
Q1: What concrete strength is required for this expansion bolt?
A: The bolt is designed for use in concrete with compressive strength ≥ C20/25. For lower strength concrete, we recommend a reduced load or a larger anchor size. Full load tables are available upon request.
Q2: Can the bolt be used outdoors or in coastal areas?
A: Yes, 304 stainless steel offers excellent resistance to atmospheric corrosion, including marine environments. For extreme conditions (e.g., chlorides), we suggest 316 stainless steel as an alternative – please consult our sales team.
Q3: How do I obtain the ETA certificate for my project?
A: Each shipment includes a Declaration of Performance (DoP) referencing the ETA number. A digital copy of the full ETA document can be provided upon request. Ensure the product code matches the scope of the assessment.
Q4: What is the maximum embedment depth?
A: The standard recommendation is 1.5x to 2.0x the bolt diameter (e.g., for M12, min. embedment = 48 mm). Detailed installation instructions are included in each box. For special requirements, check with our engineers.
Q5: Are free samples limited to one type or size?
A: We provide up to 5 free samples per inquiry, covering different diameters or lengths. You only pay for shipping. This allows you to test multiple configurations before placing an order.
Q6: What packaging options are available for export?
A: Standard packaging is cardboard cartons on pallets (20-25 kg each). For large orders, we use shrink-wrapped bundles or wooden crates. Custom labeling and barcoding can be arranged.
Q7: How long is the lead time for bulk orders?
A: For popular sizes (M8, M10, M12), typical lead time is 15–20 working days. Custom lengths or special finishes may require 25–30 days. We maintain inventory for quick dispatch.
Q8: Does the bolt work in overhead applications?
A: Yes, the wedge expansion mechanism provides reliable grip even when installed overhead, as long as the hole is properly cleaned and the torque matches the recommended value.
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