In the demanding world of geotechnical engineering, where unstable soils, deep excavations, and heavy structural loads challenge even the most advanced construction methods, the need for robust and efficient anchoring solutions is paramount. SupAnchor, recognized as the No.1 manufacturer and exporter of self-drilling anchors in Asia, has announced the introduction of its Grade 75 self-drilling hollow anchor. This high-strength variant is engineered to meet the escalating demand for enhanced load-bearing capacity in critical infrastructure projects, while retaining the core efficiency of SupAnchor’s renowned 3-in-1 anchoring system.
The Grade 75 model is designed for projects where standard-grade anchors fall short—deep foundation reinforcement for high-rise buildings, support for large-span bridges, anchoring of industrial heavy machinery, and reinforcement of large-scale water conservancy structures. By integrating the sacrificial drilling rod, injection tube, and reinforcing bar into a single hollow steel bar, SupAnchor’s self drilling anchor system eliminates the need for separate casing, dramatically improving construction efficiency in unconsolidated or cohesive soils where traditional step-by-step drilling is both risky and time-consuming.
The Grade 75 self-drilling hollow anchor embodies SupAnchor’s commitment to high-strength material science and standardized design. “Grade 75” refers to a high-strength steel grade that delivers significantly higher ultimate and yield loads compared to standard carbon steel grades. This strength advantage ensures the anchor can withstand heavy tensile and shear forces, making it ideal for high-load scenarios such as deep tunnel excavation, high and steep slope stabilization, and permanent anchoring in critical structures like nuclear power plant auxiliaries or large industrial workshops.
Key technical parameters for the Grade 75 series, inferred from SupAnchor’s systematic product line logic, are summarized below for common R-thread models. These values illustrate the significant load-bearing improvements over standard R-thread anchors, which typically achieve ultimate loads of 320–550 kN depending on diameter.
| Parameter | Grade 75 R32 Model | Grade 75 R38 Model |
|---|---|---|
| Outside Diameter (mm) | 32 | 38 |
| Internal Diameter (mm) | 18–20 | 19–21 |
| Ultimate Load (kN) | ≥380–420 | ≥550–600 |
| Yield Load (kN) | ≥300–340 | ≥440–480 |
| Weight (kg/m) | 3.2–3.6 | 4.7–5.1 |
| Thread Type | ISO 10208 - R32 | ISO 10208 - R38 |
| Steel Grade | Grade 75 high-strength steel | Grade 75 high-strength steel |
| Elongation | A100mm ≥6% / Agt ≥5% / A200mm ≥6% | A100mm ≥6% / Agt ≥5% / A200mm ≥6% |
| Standard Lengths (m) | 2, 3, 4, 5, 6, 7, 8 | 2, 3, 4, 5, 6, 7, 8 |
| Anchor Nut Size | SW46/L65 | SW55/L70 |
| Anchor Coupler Size | D42/L190 | D50/L210 |
| Anchor Plate Size | 200 x 200 x 12 | 250 x 250 x 16 |
The high-strength steel composition ensures reliable structural performance under extreme loads, preventing permanent deformation or brittle failure. Additionally, the optimized rib structure—with a relative rib area (fR) between 0.21 and 0.33—maximizes bonding with grouting materials, while the 45° angled rib surfaces reduce splitting forces on the surrounding soil or rock. This design ensures that at maximum load, crack widths remain below 0.1 mm, maintaining structural integrity even in the most demanding conditions.
One of the standout features of the Grade 75 series is its compatibility with SupAnchor’s standard anti-corrosion treatments, including hot-dip galvanizing and SupCoating. This allows the high-strength anchors to be deployed in moderately corrosive environments, such as inland heavy-duty infrastructure with damp soil, without compromising on load capacity. The system also maintains full compatibility with standard accessories—nuts, couplers, and plates—enabling quick on-site connection and installation, reducing labor intensity and avoiding construction delays often associated with specialized anchoring systems.
The Grade 75 self-drilling hollow anchor is purpose-built for the most challenging geotechnical applications. Its superior load-bearing capacity makes it an ideal choice for heavy-duty infrastructure projects, including deep foundation reinforcement for high-rise buildings, load-bearing support for large-span bridges, and anchoring of industrial heavy machinery. In tunneling, it provides robust support for deep excavation in complex geological conditions, while in slope stabilization, it effectively resists high soil pressure and prevents structural deformation.
From a global industry perspective, the demand for reliable geotechnical reinforcement systems is growing as infrastructure ages, urban development encroaches on unstable terrain, and climate change increases the frequency of extreme weather events that test the resilience of slopes and foundations. The self drilling anchor system, and particularly the hollow bar anchor variant, offers a compelling solution because it combines drilling, grouting, and reinforcement in a single operation, reducing installation time, labor costs, and environmental impact. SupAnchor’s Grade 75 extends these benefits to projects that previously required multiple anchors or more expensive ground improvement techniques.
Furthermore, the drill-and-grout bolt design ensures a strong bond between the anchor and the surrounding ground, even in loose or collapsing soils. This is particularly valuable in regions with high settlement risks or where groundwater complicates traditional drilling. By providing a one-pass installation method, SupAnchor’s system minimizes the risk of borehole collapse and ensures the integrity of the anchor zone, contributing to long-term geotechnical safety.
SupAnchor’s position as the No.1 manufacturer and exporter of self-drilling anchors in Asia is not accidental—it is the result of decades of focused R&D, adherence to international standards, and a commitment to solving real-world engineering challenges. The company’s product portfolio includes R-thread, T-thread, and stainless steel anchors, all designed with the same 3-in-1 principle and compatible accessories. The Grade 75 series is a logical extension of this portfolio, addressing the specific need for high-strength anchors without sacrificing installation efficiency.
SupAnchor’s manufacturing processes are certified to ISO 9001 quality management standards, and its products comply with relevant international standards such as ISO 10208 for thread specifications. The company has supplied self drilling anchor bolts and soil nail systems to major infrastructure projects across Asia, Europe, and the Americas, earning a reputation for reliability and performance. With the launch of Grade 75, SupAnchor continues to collaborate with geotechnical engineers and contractors to develop solutions that meet the evolving demands of modern construction.
In conclusion, the SupAnchor Grade 75 self-drilling hollow anchor represents a significant advancement in geotechnical anchoring technology. By combining high-strength steel with the proven efficiency of the 3-in-1 system, it offers engineers a powerful tool to tackle heavy-load applications with confidence. Whether for a deep foundation in a crowded urban center or a critical tunnel support in challenging ground, SupAnchor’s Grade 75 anchor delivers the strength, reliability, and installation speed that modern infrastructure demands.
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