In coastal construction and chemical‑zone ground engineering, conventional steel anchors degrade rapidly, forcing frequent replacement and risking structural failure. SupAnchor, Asia’s leading manufacturer of self‑drilling anchor systems, now addresses this challenge with a dedicated stainless steel variant of its proven hollow bar anchor technology. The new R32SS/15 and unlisted larger‑diameter models bring inherent rust‑resistance to the drill‑and‑grout bolt method, ensuring decades of maintenance‑free service in saltwater, acid‑vapor, and high‑humidity conditions.
The stainless steel self‑drilling hollow anchor retains SupAnchor’s signature 3‑in‑1 principle: a sacrificial drilling rod, injection tube, and load‑bearing reinforcing bar are integrated into a single ribbed hollow stainless steel bar. This allows simultaneous drilling and grouting without a separate casing, dramatically speeding installation in unconsolidated or cohesive soils while preventing borehole collapse. Unlike zinc‑coated or epoxy‑painted carbon steel bolts, the anchor’s stainless steel composition inherently resists pitting, crevice corrosion, and stress‑corrosion cracking, even when constantly exposed to chloride‑rich seawater or industrial chemicals. The threaded profile follows either the ISO 10208‑compliant R thread or the T international standard, guaranteeing instant compatibility with standard nuts, couplers, and plates on site. Optimized rib geometry – with a relative rib area fR between 0.21 and 0.33 and 45° angled rib faces – maximizes grout bonding while limiting splitting forces on the surrounding ground, keeping crack widths below 0.1 mm at maximum load.
The representative R32SS/15 model demonstrates the mechanical robustness that accompanies the corrosion‑resistant material. Key parameters are summarized below.
| Parameter | Value |
|---|---|
| Outside Diameter | 32 mm |
| Internal Diameter | 14 mm |
| Cross‑Sectional Area | 509 mm² |
| Ultimate Load | ≥405 kN |
| Yield Load | ≥300 kN |
| Weight | 4.00 kg/m |
| Thread Standard | ISO 10208 – R32 (Left or Right) |
| Steel Type | Stainless steel (EN‑compliant) |
| Elongation | A100mm ≥6% / Agt ≥5% / A200mm ≥6% |
| Available Lengths | 1 m increments: ×2, ×3, ×4, ×5, ×6 |
| Anchor Nut / Coupler / Plate | SW46/L75 / D42/L220 / 200×200×12 mm |
Beyond this model, the stainless steel series extends to diameters of 25 mm, 38 mm, and 51 mm, matching the size range of the R‑thread and T‑thread families. All variants maintain the same rib‑optimized bonding and accessory compatibility, enabling engineers to specify a corrosion‑proof ground anchor bolt for virtually any project load and soil type.
The product portfolio directly targets environments where carbon steel anchors fail prematurely. Typical deployment scenarios include:
Owners and contractors gain measurable benefits: elimination of epoxy‑coating field repairs, no cathodic protection requirements, and drastically reduced whole‑life costs. The system’s ability to drill and grout in a single pass further trims construction schedules by avoiding casing extraction, particularly in collapsing soils and water‑bearing strata. In a recent marine terminal rehabilitation, substituting stainless steel self‑drilling anchor bolts for coated carbon steel reduced anchor replacement projections from 15 years to a design life exceeding 75 years, with no additional protective layers needed.
The stainless steel variant reinforces SupAnchor’s position as the world’s top‑tier geotechnical reinforcement system supplier. Already holding ISO 9001, ISO 14001, and OHSAS 18001 certifications, the company continues to push innovation in soil nail system manufacturing. By integrating corrosion‑resistant alloys directly into the hollow bar anchor production, SupAnchor enables engineers to meet the most recent Eurocode 7 durability requirements without resorting to secondary protection measures that often fail in field conditions. Global projects – from container ports in Southeast Asia to coastal railway tunnels in Latin America – now have access to a factory‑produced ground anchor bolt that combines drill‑and‑grout speed with inherent longevity. This aligns with the industry’s shift toward design‑for‑durability and whole‑life asset management, where the initial material investment yields exponential savings in maintenance and operational continuity.
As infrastructure budgets face increasing scrutiny and climate change raises exposure to aggressive environments, SupAnchor’s stainless steel self‑drilling anchor system delivers the professional, innovative, and collaborative solution that modern geotechnical engineering demands. With on‑demand custom lengths and a full range of certified accessories, design teams can now specify a fully corrosion‑resistant hollow bar anchor without compromising on installation speed or mechanical capacity, cementing the company’s role as the partner of choice for resilient ground engineering worldwide.
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