1.Technical Specifications
| Item | Specification |
| Product Name | R25 Self-Drilling Hollow Anchor Bar |
| Outer Diameter | 25 mm |
| Inner Diameter | 12 mm |
| Cross Section Area | 292 mm虏 |
| Ultimate Load | 200 kN |
| Yield Load | 150 kN |
| Weight | 2.3 kg/m |
| Thread Type | ISO10208 |
| Steel Grade | EN10083-1 |
| Thread Direction | Left or right |
| Length | 1 m, 2 m, 3 m, 4 m, 5 m, 6 m, 7 m, 8 m, 9 m |
| Corrosion Protection | Optional |
2. Accessories
| Accessory | Main Specification |
| Nut | Size 41 mm, length 35 mm, hardness HRC 25-30, steel CK45, ISO10208 thread, weight 0.25 kg |
| Coupler | Outer diameter 42 mm, length 150 mm, hardness HRC 23-30, steel EN10083-1, ISO10208 thread, weight 0.60 kg |
| Bearing Plate | 150 x 150 mm, thickness 8 mm, hole diameter 30 mm, weight 1.4 kg |
| Drill Bit Adapter | Anchor thread R25, drill bit thread R32 / R38 / T40, length 50 mm, weight 0.1 kg |
3. Applications
R25 hollow anchor bars are used for tunnel or surface support projects.
Examples of applications:
√ Tunnel support
√ Mine roadway support
√ Rock bolt support system
√ Slope stabilization
√ Foundation anchorage support
√ Underground cavern support
√ Hydropower projects
√ Metro tunnels and railway tunnels
√ Fractured rock support
√ Ground support (Temporary/permanent)
4. Advantages
The construction efficiency is improved because drilling and grouting processes are done using the anchor bar itself. Acts as drill rod and grouting pipe. Simplifies the construction process and prevents grout loss caused when the grouting pipe is withdrawn.In addition, because R25 anchor bars allow full pressure grouting ,grout injected into the anchor body can fill in cracks around the borehole.
And wrap the anchor body throughout its length.This ensures better corrosion resistance,long-term bonding strength and support performance.
5. Corrosion Protection Options
We can provide optional corrosion protection to prolong service life. Options include:
* Hot-dip galvanized per ISO 14 61
* Epoxy coating with bending performance tested to ISO 15 19
* Impact tested per ASTM D27 94
* Adhesion tested to ISO 24 09:2007
6. Custom Options
In addition to providing R25 hollow anchor bars, we can customize other anchor bar accessories to meet project needs.
Custom Options Include
√ Anchor bar length
√ Threaded surface:left/right
√ Nut
√ Coupler length
√ Bearing plate size
√ Drill bit adapter
√ Corrosion protection options
√ Packaging method
7. FAQ
Q: What is an R25 self-drilling hollow anchor bar?
A: Hollow threaded anchor bar that can be used for drilling ,grouting and anchoring.The anchor bars are mainly used for tunnel support,mining support and geotechnical support.
Q: What is the load capacity of R25 hollow anchor bar?
A: The ultimate load is 200 kN.The yield load is 150 kN.
Q: Can you inject grout through the anchor bar?
A: Yes there is a hollow center that can be used as grouting channel. So you can inject grout through the anchor body.
Q: What accessories are available?
A: There are many accessories available. Common accessories include nuts,couplers,bearing plates and drill bit adapters.
Q: Is corrosion protection available?
A: Yes, there are optional hot-dip galvanizing or epoxy coatings available.
Related
Related News
service
We deliver complete support for underground reinforcement applications, covering: Mining roof and sidewall support systems Tunnel reinforcement solutions Slope stabilization engineering support Foundation anchoring systems Underground safety structural systems From early-stage project planning to on-site application, we help customers build safer and more stable underground environments.
Wanfeng provides a fully integrated product supply system, enabling customers to source all ground support materials from one supplier: Rock bolt systems (resin / FRP / threaded) Cable bolts & anchoring systems Steel arches & I-steel support systems Wire mesh & reinforcement mesh Plates, nuts, bolts & fastening components Resin & cement anchoring materials Mining tools & consumable accessories Our one-stop supply capability reduces procurement complexity and improves project efficiency.
We ensure stable and reliable product performance through strict manufacturing and quality control systems: Standardized production processes Raw material inspection and control Mechanical performance testing Load-bearing and tensile strength verification Batch consistency inspection Final quality inspection before shipment Every product is engineered to meet demanding underground safety requirements.
We also support customized solutions for different mining and engineering projects: Customized rock bolt specifications Non-standard steel support design Special mesh and reinforcement structures Project-based product configuration OEM / private label cooperation We work closely with global partners to develop tailored solutions for complex underground environments.
With strong export experience, we provide efficient global delivery and supply chain support: International export packaging standards Container loading optimization Multi-region shipping support Fast production scheduling for urgent projects Stable long-term supply agreements We ensure reliable delivery to mining projects across different countries and regions.
We support customers throughout the entire project lifecycle: Technical documentation support Installation guidance assistance Product replacement support Long-term supply continuity Engineering consultation for project expansion Our goal is to build long-term partnerships, not just single transactions.
Message
