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Help CenterChina Manufacturer Through Bolt Long Thread ETA Approved High Hardness Carbon Steel Full Sizes Available
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Hefei SENOTECH New Materials Co., Ltd is proud to introduce our premium Through Bolt Long Thread series – a robust fastening solution engineered for demanding structural applications. As a reliable trading company established in 2020 and exporting over US$1 million annually to markets across North America, South America, Europe, Asia, Africa, and Oceania, we combine strict quality control with competitive pricing. Our through bolts feature ETA approval, high-hardness carbon steel construction, and full-size availability to meet diverse project requirements.
These bolts are designed with an extended threaded portion to provide superior grip and load distribution in concrete and steel connections. Whether you need them for bridge construction, wind tower foundations, or heavy machinery anchoring, our full size range ensures you find the exact dimensions. Manufactured from high-carbon steel with advanced heat treatment, they deliver exceptional tensile strength and durability even under extreme conditions.
Key Features & Benefits
- ETA Approved – Meets European Technical Assessment standards for construction products, ensuring reliable performance in safety-critical applications.
- High Hardness Carbon Steel – Increased wear resistance and load-bearing capacity, reducing risk of thread stripping or bolt failure.
- Long Thread Design – Provides deeper embedment in concrete or nut engagement, enhancing pull-out resistance and clamping force.
- Full Sizes Available – From M12 to M48 (or custom diameters) with lengths up to 1500 mm, catering to a wide spectrum of engineering needs.
- Customizable Surface Treatment – Plain (as-rolled), zinc-plated, hot-dip galvanized, or Dacromet coating options for corrosion protection in different environments.
- Consistent Quality – We implement stringent inspections including chemical composition analysis, mechanical testing, and dimensional checks per batch.
Technical Specifications (Typical)
| Parameter | Value |
|---|---|
| Material Grade | Carbon Steel (e.g., 4.6, 5.6, 8.8, 10.9 – optional) |
| Hardness (HRC) | 22–32 (depending on grade) |
| Thread Length | ≥ 2x bolt diameter (customizable) |
| Tensile Strength | Up to 1000 N/mm² (grade dependent) |
| Standard Compliance | ETA, DIN 975/976, ASTM A325/A490 (upon request) |
| Coating Thickness | Zinc: 5–15 µm / HDG: 50–85 µm |
Why Choose SENOTECH?
Since 2020, Hefei SENOTECH has been bridging Chinese manufacturing excellence with global demand. With an annual export value of US$1–1.5 million, we have served clients in over 10 regional markets including North America, Europe, Southeast Asia, and Africa. Our dedicated team ensures that every through bolt meets rigorous quality standards before shipment. We offer flexible packaging (cartons, pallets, or as per buyer's request) and competitive lead times.
Our long-thread bolts have been used in notable infrastructure projects, providing reliable connections in steel-to-concrete anchoring. Combined with ETA approval, they give engineers confidence in design safety. We also provide batch traceability reports and third-party inspection certificates when required.
Ready to place an order or need a quote? Contact us today to discuss your specific size, grade, and surface finish requirements. With full sizes available and fast shipping, SENOTECH is your trusted partner for high-quality through bolts.
Frequently Asked Questions
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Q: What does ETA approval mean for these bolts?
A: ETA (European Technical Assessment) confirms that the product complies with European standards for construction products, ensuring reliable performance and legal market access in EU countries. -
Q: Can I get bolts smaller than M12 or larger than M48?
A: Yes, we can customize diameters from M6 to M64 based on your engineering drawings. Contact us with your requirements. -
Q: What is the typical lead time for bulk orders?
A: For standard sizes (M16–M36), lead time is around 15–25 working days after confirmation, depending on quantity and surface treatment. -
Q: Do you provide samples before mass production?
A: Yes, we offer samples (shipping cost borne by buyer) for quality evaluation. Samples can be produced within 7 working days. -
Q: How do you ensure high hardness and consistent quality?
A: We use controlled heat treatment processes and perform hardness tests (Rockwell) and tensile tests on every batch, with reports available. -
Q: Which markets do you mainly export to?
A: Our main markets include North America, South America, Europe, Southeast Asia, Africa, Oceania, and the Middle East. We ship globally. -
Q: Are there minimum order quantities (MOQ)?
A: MOQ varies by size. For popular sizes, MOQ is around 500 pieces. For special lengths, MOQ may be 1000 pieces. Contact us for details. -
Q: What payment terms do you accept?
A: We typically accept T/T, L/C, or Western Union. Custom terms can be negotiated for regular clients.
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