As global infrastructure projects push deeper into challenging ground conditions, the demand for reliable, high-capacity geotechnical reinforcement systems has never been greater. SupAnchor, recognized as Asia’s leading manufacturer and exporter of self-drilling anchors, has introduced its Grade 75 self-drilling hollow anchor—a high-strength variant designed to provide superior load-bearing capacity while retaining the proven 3-in-1 integration principle that defines the company's product line.
The Grade 75 anchor addresses a critical need in heavy-duty applications such as deep foundation support, large-scale tunnel reinforcement, and slope stabilization, where standard-grade anchors may fall short against extreme tensile and shear forces. By leveraging high-strength steel and standardized thread design, SupAnchor ensures this new offering integrates seamlessly into existing installation workflows, delivering enhanced performance without compromising efficiency.
The Grade 75 self-drilling hollow anchor builds on SupAnchor’s core technology, which combines a sacrificial drilling rod, injection tube, and reinforcing bar into a single hollow bar. This design enables simultaneous drilling and grouting—eliminating the need for separate casing systems and dramatically improving construction speed in unconsolidated or cohesive soils. The anchor’s high-strength steel (Grade 75) provides significantly higher ultimate and yield loads compared to standard carbon steel variants.
While exact technical data for independent Grade 75 models are outlined in SupAnchor’s product literature, the following inferred parameters illustrate the anchor’s capabilities for common diameters (R32 and R38):
| Parameter | Grade 75 R32 Model | Grade 75 R38 Model |
| Outside Diameter | 32 mm | 38 mm |
| Internal Diameter | 18–20 mm | 19–21 mm |
| Cross Sectional Area | 400–450 mm² | 600–650 mm² |
| Ultimate Load | ≥380–420 kN | ≥550–600 kN |
| Yield Load | ≥300–340 kN | ≥440–480 kN |
| Weight | 3.2–3.6 kg/m | 4.7–5.1 kg/m |
| Thread Type | ISO 10208 - R32 / Left or Right | ISO 10208 - R38 / Left or Right |
| 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 | 2–8 m (in 1 m increments) | 2–8 m (in 1 m increments) |
These specifications ensure the anchor can withstand heavy tensile and shear forces, making it suitable for deep foundation reinforcement, heavy-duty tunnel support, and large-scale slope stabilization. The rib structure, optimized with a relative rib area (fR) of 0.21–0.33, maximizes bonding with grout materials, while 45° angled rib surfaces reduce splitting forces in surrounding soil or rock—maintaining crack widths below 0.1 mm at maximum load for long-term structural integrity.
Additionally, the Grade 75 anchor is compatible with SupAnchor’s anti-corrosion options, including hot-dip galvanizing and SupCoating, extending its service life in moderately corrosive environments such as damp soil typical of inland heavy infrastructure projects.
The Grade 75 self-drilling anchor bolt is engineered for the most demanding geotechnical challenges. Typical applications include:
By offering superior load capacity while maintaining the installation efficiency of a self-drilling anchor system, the Grade 75 variant enables engineers to address high-load scenarios without resorting to complex, multi-step installation processes. This directly translates into reduced labor intensity, faster project timelines, and lower overall construction costs.
The launch of the Grade 75 hollow bar anchor reinforces SupAnchor’s role as a pioneer in geotechnical reinforcement systems. With a product portfolio that spans R thread, T thread, and stainless steel anchors, the company now provides a complete high-strength sub-line to meet diverse project needs. SupAnchor’s commitment to innovation is backed by ISO certifications and a track record of global projects, from urban metros to mining operations.
As the world’s infrastructure demands grow, the need for reliable, high-performance ground anchor bolt factory solutions becomes paramount. SupAnchor’s Grade 75 self-drilling anchor not only addresses this demand but also sets a new benchmark for strength and versatility in the geotechnical sector. With its focus on professional engineering, continuous innovation, and collaborative customer partnerships, SupAnchor continues to deliver solutions that build the foundations of tomorrow.
A major highway project in the Alps uses SupAnchor's self drilling anchor system to stabilize steep slopes and mitigate landslide risks, showcasing the efficiency of hollow bar anchors.
SupAnchor launches Grade 75 self-drilling hollow anchor, offering higher tensile strength for demanding geotechnical projects.
A major highway project in the Alps utilizes SupAnchor's self-drilling anchor system to stabilize unstable slopes. The innovative hollow bar anchors address challenging geology.
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A major highway project in the Alps uses SupAnchor's self drilling anchor system to address complex geology, ensuring long-term slope stability and safety.
