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Help CenterConcrete Expansion Bolt Long Thread Heavy Duty High Loading Capacity Full Sizes Available
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Hefei SENOTECH New Materials Co., Ltd is proud to present the Concrete Expansion Bolt Long Thread Heavy Duty High Loading Capacity Full Sizes Available. As a reliable trading partner established in 2020 with annual exports exceeding USD 1 million, we source only the highest-grade fasteners for global markets including North America, Europe, Southeast Asia, and the Middle East. This expansion bolt is engineered for demanding structural anchoring in concrete and masonry, featuring a deep-thread design that maximizes grip and load distribution. Whether you need a M6 for light fixtures or a heavy M24 for industrial machinery, our full size range ensures the right fit for your project.
Key Features & Technical Specifications
- Long Thread Design: The extended threaded section allows for deeper embedment and better locking, reducing the risk of loosening under vibration or dynamic loads.
- Heavy Duty Loading Capacity: Manufactured from high-strength carbon steel (Grade 4.8/8.8 optional) with a tensile strength exceeding 800 MPa for premium grades, ensuring reliable performance even in critical applications.
- Full Size Availability: We stock diameters from 6 mm to 24 mm (1/4" to 1") and lengths from 50 mm to 300 mm. Custom sizes are available upon request.
- Exceptional Corrosion Resistance: Choose from zinc-plated (standard), hot-dip galvanized, or stainless steel finishes to match your environmental conditions – ideal for outdoor, marine, or chemical exposure.
- Easy Installation: The expansion clip expands firmly against the concrete wall when torqued, providing an immediate and secure hold without the need for epoxy or grout.
| Parameter | Specification |
|---|---|
| Material | Carbon Steel (C45, 40Cr), Stainless Steel (SS304, SS316) |
| Thread Length | Full thread (standard) or custom partial thread |
| Load Capacity (example) | M10 bolt: ≥ 15 kN tension / 20 kN shear (C30 concrete) |
| Finishes | Zinc plated (white/blue), hot-dip galvanized, black oxide, plain |
| Applicable Substrate | Normal weight concrete (≥C20), solid brick, stone |
| Packaging | Poly bags, boxes, bulk pallets; OEM/private label available |
Our expansion bolts undergo rigorous batch testing to ensure dimensional accuracy and consistent expansion performance. The long thread profile allows for precise torque adjustment, making them ideal for seismic retrofitting, heavy machinery anchoring, and infrastructure projects. Contractors benefit from reduced installation time – no special tools required, just a standard wrench or socket.
Why Choose Hefei SENOTECH?
Since our founding in 2020, we have exported over USD 1 million annually in fasteners to more than 10 countries across North America, South America, Europe, Asia, and Africa. Our experienced team works directly with ISO-compliant factories to maintain strict quality control. We offer flexible order quantities (from 500 pcs per size) and fast turnaround times. Every shipment comes with a quality inspection report. We are committed to providing products that meet international standards such as ANSI, DIN, and GB (please consult for specific certifications).
Let our Heavy Duty Concrete Expansion Bolts be the reliable solution for your next project. Contact us today for a quote, technical data, or free samples; our engineering support is available to assist with anchor selection and installation guidance.
Frequently Asked Questions
Q1: What is the difference between a long thread and a standard thread expansion bolt?
A: Long thread bolts have a threaded section that extends from the head to near the expansion end, allowing for adjustable clamping depth and better vibration resistance. Standard thread bolts have a shorter threaded portion.
Q2: Can these bolts be used in cracked concrete?
A: Our standard expansion bolts are designed for uncracked concrete. For cracked concrete applications, special anchors with supplementary reinforcement may be required. Please contact us for recommendations.
Q3: Are stainless steel versions available for outdoor use?
A: Yes, we offer SS304 and SS316 stainless steel options. SS316 is recommended for coastal or highly corrosive environments.
Q4: What is the maximum embedment depth recommended?
A: Typically the embedment depth should be at least 4 times the diameter of the bolt. For M12 bolts, that would be 48 mm minimum. Our technical datasheet provides exact values per size.
Q5: Do you provide certificates of test?
A: Yes, we can provide mill test reports (MTR) and batch test certificates upon request. For material certifications, please inquire before ordering.
Q6: Can I order a mixed container with different sizes?
A: Absolutely. We support mixed-size orders with custom packing. Minimum quantity per size is usually 500 pcs for stock sizes.
Q7: What torque should I apply for a M10 bolt in C30 concrete?
A: Recommended installation torque is around 50-60 N·m. Overtightening may damage the concrete. We provide a torque chart with each shipment.
Q8: Do you offer samples before bulk order?
A: Yes, free samples are available; you only pay the shipping cost. Contact our sales team to arrange.
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