As global infrastructure projects push into more challenging ground conditions, the demand for high-capacity anchoring solutions has never been greater. SupAnchor, the No.1 manufacturer and exporter of self drilling anchor systems in Asia, has officially launched its Grade 75 self-drilling hollow anchor—a high-strength variant engineered to meet the most demanding load-bearing requirements in geotechnical reinforcement systems. This new product expands the company’s portfolio, offering contractors a reliable solution for heavy-load applications where standard anchors may fall short.
The Grade 75 hollow bar anchor follows the proven 3-in-1 principle that defines SupAnchor’s self drilling anchor bolt range: a sacrificial drilling rod, injection tube, and reinforcing bar combined into one ribbed hollow steel bar. This integration allows simultaneous drilling and grouting, eliminating the need for separate casing systems and dramatically improving efficiency in unconsolidated or cohesive soils. For engineers facing tight schedules and difficult geology, the Grade 75 delivers both speed and uncompromising strength.
At the core of the Grade 75 self-drilling hollow anchor is its high-strength steel composition, which provides significantly higher ultimate and yield loads compared to standard carbon steel grades. This makes it ideal for deep foundation reinforcement, heavy-duty tunnel support, and large-scale slope stabilization. The anchor’s ribbed profile, with an optimized relative rib area (fR = 0.21–0.33), maximizes bond with grout while the 45° angled ribs reduce splitting forces on surrounding soil or rock—critical for maintaining structural integrity under extreme loads.
To illustrate the performance leap, consider the inferred technical data for two common diameters in the Grade 75 series:
| 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 |
| Elongation | A100mm ≥6% / Agt ≥5% | A100mm ≥6% / Agt ≥5% |
| Standard Lengths (m) | 2, 3, 4, 5, 6, 7, 8 | 2, 3, 4, 5, 6, 7, 8 |
These figures demonstrate a substantial increase in load-bearing capacity over standard R-thread models. For example, the standard R32/20 offers an ultimate load of ≥280 kN, while the Grade 75 R32 model exceeds 380 kN—a 35% improvement. This extra capacity translates directly into safer designs, fewer anchors required, and reduced overall project costs. The Grade 75 anchor also supports SupAnchor’s anti-corrosion treatments, including hot-dip galvanizing and SupCoating, extending its service life in damp or moderately aggressive environments.
Installation remains as straightforward as with any SupAnchor system. The standardized thread design allows quick on-site connection with nuts, couplers, and plates, while the hollow core enables efficient grout injection. Contractors already familiar with SupAnchor’s R or T thread self drilling anchor bolts can seamlessly integrate Grade 75 components without retraining crews or altering equipment.
The Grade 75 self-drilling hollow anchor is engineered for projects where failure is not an option. Its high tensile and yield strengths make it suitable for:
As a leading soil nail system manufacturer, SupAnchor understands that different projects demand different performance characteristics. The Grade 75 variant complements the company’s existing range—including corrosion-resistant stainless steel anchors and standard R/T thread options—to cover the full spectrum of geotechnical challenges. Whether it’s a highway tunnel under a mountain range or a critical retaining wall for a water conservancy project, the Grade 75 delivers the reliability that structural engineers require.
The global push toward resilient infrastructure and underground space utilization is driving demand for robust drill-and-grout bolt solutions. Tunneling, mining, and geotechnical safety all benefit from anchors that can withstand higher loads without excessive deformation. The Grade 75 self drilling anchor system directly addresses this need, offering a balanced combination of strength, corrosion resistance, and installation efficiency.
SupAnchor’s reputation as a ground anchor bolt factory with rigorous quality control is reinforced by this launch. The company’s ISO 10208-compliant thread designs, ISO 9001-certified manufacturing processes, and track record on major projects across Asia, Europe, and the Americas position it as a trusted partner for global contractors. The Grade 75 series embodies SupAnchor’s brand message: Professional in engineering precision, Innovative in product development, and Collaborative in supporting clients from design to installation.
As infrastructure investments accelerate worldwide, high-capacity anchoring systems like the Grade 75 will play an increasingly vital role in ensuring the safety and longevity of critical structures. With this new addition, SupAnchor continues to lead the self drilling anchor market, offering solutions that meet the demands of modern geotechnical engineering.
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