R25 Self-Drilling Anchor Bar for Light Soil Nailing
R25 hollow self-drilling anchor bar for light soil nailing and shallow ground support. Typical R25N-14 reference values include 25 mm outside diameter, 14 mm internal diameter, 150 kN yield load and 200 kN ultimate load.
| Designation | R25N-14 hollow self-drilling anchor bar |
| Outer Diameter | 25 mm |
| Typical Inner Diameter | 14 mm |
| Typical Yield Load | 150 kN reference value |
| Typical Ultimate Load | 200 kN reference value |
| Typical Weight | About 2.3 kg/m |
| Thread Type | Continuous R-thread hollow bar |
| Common Applications | Light soil nailing, shallow slope support, temporary excavation support |
R25 hollow self-drilling anchor bar for light soil nailing, shallow slope stabilization, portal trimming and low-load ground support where small diameter and easy handling are priorities.
Product Overview
R25 self-drilling anchor bar is a compact hollow threaded bar used where the project needs light reinforcement, fast installation and practical manual handling. It combines drilling, grouting and anchoring in one operation.
The product is suitable for shallow slopes, temporary excavation faces, low-height soil nail walls and local stabilization works where oversized anchor systems would increase cost and drilling effort.
R25 should be selected only when project load demand, bond length and ground condition fit a light-duty anchor system. For higher loads, R32, R38 or R51 may be more appropriate.
Technical Specifications
| Designation | R25N-14 hollow self-drilling anchor bar |
|---|---|
| Outer Diameter | 25 mm |
| Typical Inner Diameter | 14 mm |
| Typical Yield Load | 150 kN reference value |
| Typical Ultimate Load | 200 kN reference value |
| Typical Weight | About 2.3 kg/m |
| Thread Type | Continuous R-thread hollow bar |
| Common Applications | Light soil nailing, shallow slope support, temporary excavation support |
Product Image Gallery
Real images from the current Self Drilling Anchor media group, used to show bar body, thread profile, hollow grouting rod and accessory details.
Applications and Real Ground Conditions
Light soil nailing
Used for shallow cut slopes and soil nail walls where moderate reinforcement is enough.
Temporary excavation faces
Suitable for short-term support in low-height excavations and site access works.
Portal trimming
Can stabilize weak ground near tunnel or culvert entrances before heavier support is installed.
Local repair
Useful for small-scale retaining, washout repair and weathered surface reinforcement.
Performance Advantages
Compact and economical
Smaller steel section keeps cost and drilling demand low for light support.
Fast installation
One-step drilling and grouting reduces work cycles in unstable shallow ground.
Easy handling
Lower bar weight helps transport and installation in restricted areas.
Complete accessories
R25 drill bits, couplers, nuts and plates can be supplied as a matched kit.
Selection Guide
Choose R25 when the ground support design is light-duty and the drilling pattern requires many small anchors rather than a few high-capacity bars.
| Use R25 | Low-load soil nails, temporary support, shallow slope stabilization. |
|---|---|
| Move to R32 | When design load, length or ground condition exceeds light-duty support. |
| Drill bit | Select clay, cross or carbide bit according to soil and weathered rock condition. |
| Corrosion | For permanent works, specify grout cover and coating requirements. |
Quality Control and Installation Checks
Material verification
Confirm nominal diameter, internal diameter, wall thickness, weight, yield load and ultimate load against the order specification and mill certificate.
Thread and coupler fit
Check thread profile, coupler engagement, nut fit and bearing plate compatibility before dispatch.
Grouting records
On site, record grout mix, pressure, volume, return flow and curing time because bond quality controls final anchor performance.
Installation traceability
Track installed length, drilling depth, bit diameter, coupler quantity and anchor location for each support point.
Export Packing and Matched Accessories
Matched system supply
Bars can ship with sacrificial drill bits, couplers, nuts, bearing plates and centralizers according to the bill of materials.
Export bundles
Bundles are prepared for container loading, sea freight and jobsite handling.
Length options
Standard and project-specific lengths can be supplied; couplers support staged installation in restricted work areas.
Documents
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 placeholder stock images.
- Specification-based quotation covering bar, drill bit, coupler, nut, plate and centralizer.
- Support for R25, R32, R38, R51, T76 and project-specific hollow bar systems.
- Export-oriented packing and documentation for international ground engineering buyers.
- Professional communication around design load, ground condition, grout plan and installation method.
- Contact-ready CTA with email and WhatsApp template variables.
Frequently Asked Questions
What is R25 self-drilling anchor bar used for?
It is used for light soil nailing, shallow slope support, temporary excavation reinforcement and local ground stabilization.
How does a self-drilling anchor work?
The hollow threaded bar acts as the drill string during installation. Cement grout is pumped through the hollow core and the same bar remains in the ground as the reinforcement tendon.
Why use a hollow bar instead of a conventional solid bar anchor?
A hollow bar system reduces the need for a stable open borehole before tendon insertion, which is useful in loose soil, fractured rock, fill and water-bearing ground.
What load information should be checked?
Typical R25N reference values are about 150 kN yield load and 200 kN ultimate load, but project design values depend on ground bond and installation quality.
How should the correct anchor size be selected?
Select R25 for light support; use R32, R38 or R51 when higher load, longer anchors or more difficult ground conditions are specified.
Which accessories are normally required?
A complete system normally includes sacrificial drill bit, coupler, nut, bearing plate and centralizer matched to the bar thread.
Can the product be used for permanent works?
Permanent works require project-specified corrosion protection, full grout cover and inspection records. Hot-dip galvanizing or other coatings can be discussed when required.
What information is needed for quotation?
Send bar size, length, quantity, design load, ground condition, drill bit type, plate size, corrosion protection requirement and destination port.
Request Technical Support and Quotation
Send anchor size, length, quantity, design load, ground condition, drill bit type, plate size, corrosion requirement and destination port. We will match the bar, bit, coupler, nut, plate and centralizer as a complete self-drilling anchor system.