As infrastructure projects grow in scale and complexity, the demand for robust and reliable ground reinforcement solutions has never been greater. In response, SupAnchor—Asia's leading manufacturer and exporter of self-drilling anchors—has expanded its product portfolio with the new Grade 75 self-drilling hollow anchor. Designed for heavy-load applications, this high-strength variant retains the proven “3-in-1” principle that defines SupAnchor’s self-drilling anchor system, integrating a sacrificial drilling rod, injection tube, and reinforcing bar into a single component. The result is a versatile geotechnical reinforcement system that dramatically improves construction efficiency while delivering the elevated load-bearing capacity required for critical infrastructure.
“The Grade 75 anchor is a direct answer to the market’s need for higher tensile and yield strength without sacrificing installation speed or corrosion protection,” said a SupAnchor spokesperson. “Engineers working on deep foundations, heavy-duty tunnel supports, and large-scale slope stabilization can now rely on a single hollow bar anchor to meet stringent design loads.”
Traditional step-by-step drilling and grouting methods often struggle in unconsolidated or cohesive soils, where the risk of borehole collapse and inefficient grout placement leads to project delays and increased costs. SupAnchor’s self-drilling anchor bolt technology eliminates the need for a separate casing system. The ribbed hollow steel bar is drilled into the ground while simultaneously injecting grout, creating a consolidated bond with the surrounding soil or rock. This drill-and-grout bolt approach is already widely adopted in tunneling, mining, and slope engineering, but the Grade 75 variant pushes performance boundaries further.
Geological conditions worldwide—from soft alluvial deposits in river basins to fractured rock in mountainous regions—demand anchors that can withstand extreme tensile and shear forces. The Grade 75 series is engineered with a high-strength steel grade that significantly exceeds the ultimate and yield loads of standard carbon steel anchors. For instance, a standard R32N/20 anchor offers an ultimate load of ≥280 kN and yield load of ≥230 kN. In contrast, the inferred Grade 75 R32 model is estimated to deliver an ultimate load of ≥380–420 kN and yield load of ≥300–340 kN. Such capacity makes it a superior ground anchor bolt for permanent support in high-rise buildings, bridges, and industrial facilities.
While full technical sheets for each diameter are forthcoming, SupAnchor’s product line logic allows reliable inference of key parameters for common sizes. The table below provides estimated technical data for the Grade 75 R32 and R38 models, based on the company’s standardized R-thread series.
| Parameter | Grade 75 R32 Model | Grade 75 R38 Model |
|---|---|---|
| Outside Diameter (mm) | 32 | 38 |
| Internal Diameter (mm) | 18–20 | 19–21 |
| Cross-Sectional Area (mm²) | 400–450 | 600–650 |
| 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 |
| Nut Size | SW46/L65 | SW55/L70 |
| Coupler Size | D42/L190 | D50/L210 |
| Bearing Plate (mm) | 200 × 200 × 12 | 250 × 250 × 16 |
These estimates reveal a product line that outperforms standard anchors in the same diameter class. The optimized rib geometry—with a relative rib area (fR) of 0.21–0.33 and 45° angled rib surfaces—maximizes grout bonding while minimizing splitting forces. Crack widths under maximum load remain below 0.1 mm, ensuring long-term structural integrity. The Grade 75 hollow bar anchor also supports SupAnchor’s full suite of anti-corrosion treatments, such as hot-dip galvanizing and SupCoating, making it suitable for both high-load and moderately aggressive environments.
The Grade 75 self-drilling anchor system is poised to address a range of demanding scenarios:
In all these applications, the 3-in-1 design accelerates construction. The drill-and-grout bolt method eliminates separate drilling rods and casings, reduces labor, and minimizes spoil removal. Site crews appreciate the quick-connectability of the standardized thread system and the consistent performance of accessories like nuts, couplers, and plates, all engineered to match the anchor bar’s load capacity. This integrated approach directly translates into cost savings and schedule certainty for contractors.
The introduction of the Grade 75 series reinforces SupAnchor’s position as a global innovator in the geotechnical reinforcement system market. With a track record of supplying self-drilling anchors to major infrastructure projects across Asia, Europe, and the Americas, the company combines deep R&D expertise with ISO-certified manufacturing processes. Its portfolio spans the full spectrum of ground anchor bolt factory solutions—from standard R and T thread anchors to stainless steel and now Grade 75 high-strength options—ensuring that engineers can specify a tailored system for any geological or loading condition.
“The Grade 75 launch is not just a product extension; it’s a clear signal that we are committed to solving the most demanding geotechnical challenges,” the spokesperson added. “By maintaining a 3-in-1 philosophy across all variants, we give our clients a unified, proven platform that reduces design risk and streamlines logistics.”
As infrastructure spending rises globally—driven by urbanization, renewable energy, and transportation upgrades—the demand for reliable ground anchor systems continues to grow. The Grade 75 self-drilling anchor bolt is positioned to become a go-to solution for engineers who require heavy-duty performance without compromising on installation speed or corrosion protection. From the mountains of the Alps to the coastal plains of Southeast Asia, SupAnchor’s latest innovation is set to leave a lasting mark on the way we build the foundations of modern society.
A recent European tunnel construction project successfully utilized SupAnchor's self drilling anchor system to overcome difficult geology, highlighting the efficiency and reliability of hollow bar anchors in modern geotechnical engineering.
SupAnchor's new Grade 75 self-drilling hollow anchor delivers higher load capacity for deep foundations, tunnels, and slope stabilization, enhancing safety and efficiency in geotechnical projects.
SupAnchor’s self drilling anchor system solves complex geological challenges in a key European tunnel project, highlighting advancements in geotechnical reinforcement for infrastructure resilience.
SupAnchor introduces the SupCT Bolt System, a combination rock bolt with steel and GFRP options, offering duplex corrosion protection and high ductility for infrastructure, mining, and tunneling projects worldwide.
SupAnchor's self-drilling anchor system was deployed in a challenging Alpine highway project, showcasing advanced geotechnical reinforcement in fractured rock conditions.
