R32 Self-Drilling Hollow Anchor Bar for Soil Nailing
R32 self-drilling hollow anchor bar for general soil nailing, slope stabilization, tunnel support and excavation reinforcement.
| Designation | R32N / R32S hollow self-drilling anchor bar |
| Outer Diameter | 32 mm |
| Typical Inner Diameter | 15-21 mm depending on variant |
| Typical Yield Load | About 230-280 kN |
| Typical Ultimate Load | About 280-360 kN |
| Typical Weight | About 2.9-4.1 kg/m |
| Common Drill Bit Diameter | Selected according to ground condition and grout cover requirement |
| Main Use | Soil nails, slope anchors, tunnel face bolts, excavation support |
R32 hollow self-drilling anchor bar for soil nailing, slope support, tunnel face bolting and general excavation reinforcement.
Product Overview
R32 is one of the most widely used self-drilling hollow anchor bar sizes because it balances drilling speed, load capacity, grout flow and cost. It is suitable for contractors who need a practical general-purpose anchor for soil and weak rock.
The bar can be drilled directly into loose or fractured ground with a sacrificial bit, then grouted through the hollow core. Couplers allow extension when anchor length exceeds a single bar section.
R32N and R32S variants can be selected according to required wall thickness and load capacity. The final choice should match project drawings and geotechnical design.
Product Image Gallery
Real anchor product images from the current SunSea Steel media library, showing hollow bars, threaded profiles, grouting anchor rods and accessory details.
Technical Specifications
| Designation | R32N / R32S hollow self-drilling anchor bar |
|---|---|
| Outer Diameter | 32 mm |
| Typical Inner Diameter | 15-21 mm depending on variant |
| Typical Yield Load | About 230-280 kN |
| Typical Ultimate Load | About 280-360 kN |
| Typical Weight | About 2.9-4.1 kg/m |
| Common Drill Bit Diameter | Selected according to ground condition and grout cover requirement |
| Main Use | Soil nails, slope anchors, tunnel face bolts, excavation support |
Applications and Ground Conditions
Soil nailing
Well suited to cut slopes, retaining faces and excavation walls.
Tunnel face bolting
Provides quick reinforcement for weak tunnel headings and shallow fractured zones.
Temporary works
Efficient for construction-stage support where installation speed matters.
Weathered rock
Works with suitable bit selection in broken, weathered and mixed ground.
Performance Advantages
Balanced capacity
Useful load range without requiring heavy drilling equipment.
Fast drilling
Smaller diameter helps maintain productivity on dense anchor patterns.
Flexible installation
Can be extended by couplers for longer support lengths.
Cost control
Often more economical than oversized anchor systems for general support.
Selection Guide
Choose R32 when the design calls for moderate load capacity, fast installation and practical handling on slope or tunnel support sites.
| R32N | General-purpose option where grout flow and installation speed are priorities. |
|---|---|
| R32S | Thicker-wall option for higher load demand within the R32 series. |
| Bit selection | Clay, cross or carbide bit according to soil, fill, gravel or weathered rock. |
| Accessories | Use matched R32 couplers, nuts, plates and centralizers. |
Quality Control and Installation Checks
Material and load verification
Confirm bar designation, wall thickness, yield load, ultimate load and weight per meter before production. Mill test certificates can be supplied for export orders.
Thread and coupler fit
Thread profile, coupler engagement, nut fit and plate compatibility should be checked as a complete system rather than separate parts.
Grouting control
Record grout mix, pressure, volume, return flow and curing time. Proper grout filling is essential for bond strength and corrosion protection.
Site acceptance
Installed length, drilling depth, bit diameter and accessory quantity should be recorded for each anchor position.
Accessories, Packaging and Export Supply
Matched accessory kits
Bars can be supplied with sacrificial drill bits, couplers, nuts, plates and centralizers according to project bill of materials.
Export packaging
Bundles are prepared for long-distance sea freight, container loading and jobsite handling.
Custom lengths
Standard and project-specific lengths are available. Couplers support staged installation in confined working areas.
Documentation
Packing list, commercial invoice, mill test certificate and inspection records can be prepared according to order terms.
Why Choose SunSea Steel
- Real anchor product images from the current media library, not generic placeholders.
- Specification-driven quotation covering bar, bit, coupler, nut, plate and centralizer.
- Support for R25, R32, R38, R51, T76 and project-specific self-drilling anchor systems.
- Export-oriented packaging and documentation for international buyers.
- Technical communication focused on ground condition, load requirement and installation method.
- Responsive quotation support through email and WhatsApp template variables.
Frequently Asked Questions
What is R32 self-drilling anchor bar used for?
R32 is commonly used for soil nailing, slope support, tunnel face bolting and excavation reinforcement.
What load range is typical for R32 self-drilling anchor bar?
Typical R32 reference values are about 230-280 kN yield load and about 280-360 kN ultimate load depending on variant.
Can the hollow anchor bar be grouted through the center?
Yes. Cement grout is injected through the hollow core and exits near the sacrificial drill bit, filling the annular space around the bar.
Which accessories should be ordered with the anchor bar?
A complete order usually includes drill bits, couplers, nuts, bearing plates and centralizers matched to the bar thread and ground condition.
Can self-drilling anchors be used in collapsing boreholes?
Yes. The bar drills and remains in place, so installation does not depend on maintaining a stable open borehole before inserting reinforcement.
How do I choose between R32, R38, R51 and T76?
Selection depends on design load, required length, ground condition, borehole diameter, grout volume, equipment capacity and corrosion protection requirement.
Can the surface be galvanized or coated?
Hot-dip galvanizing, epoxy coating or project-specified corrosion protection can be discussed for permanent works.
What information is needed for quotation?
Send anchor size, length, quantity, design load, drill bit type, plate size, coupler quantity, ground condition and destination port.
Request Technical Support and Quotation
Send your anchor size, length, quantity, design load, ground condition, drill bit type, plate size, coating requirement and destination port. We will match the hollow anchor bar, drill bit, coupler, nut, plate and centralizer as a complete self-drilling anchor system.