1.Technical Specifications
| Item | R51L | R51N |
| Outer Diameter mm | 51 | 51 |
| Inner Diameter mm | 36 | 32 |
| Cross Section Area mm2 | 713 | 993 |
| Ultimate Load kN | 550 | 800 |
| Yield Load kN | 450 | 630 |
| Weight kg/m | 6.3 | 7.8 |
| Thread Type | ISO10208 | ISO10208 |
| Steel Grade | EN10083-1 | EN10083-1 |
| Thread Direction | Left or Right | Left or Right |
| Length m | 1, 2, 3, 4, 5, 6, 7, 8, 9 | 1, 2, 3, 4, 5, 6, 7, 8, 9 |
| Corrosion Protection | Optional | Optional |
2. Accessories
| Accessory | Main Specification |
| Nut | Size 75 mm, length 70 mm, hardness HRC 25-30, steel CK45, thread ISO10208, weight 1.5 kg |
| Coupler | Outer diameter 63 mm, length 140 mm or 200 mm, hardness HRC 23-30, thread ISO10208, steel EN10083-1 |
| Bearing Plate | 200 x 200 mm, thickness 12 mm, hole diameter 41 mm, weight 3.6 kg |
| Centralizer | Outer diameter 90 mm, length 54 mm, hole diameter 60 mm, steel CK45, weight 0.36 kg |
| Drill Bit Adapter | Anchor thread R51, drill bit thread T73 / T76, length 50 mm, weight 0.2 kg |
3. Applications
R51 self-drilling hollow anchor bars are widely used in underground and surface support projects.
Typical applications include:
4. Benefits
Save time by drilling, grouting and anchoring with one bar. These self-drilling anchor bars are great time savers as they can be used to quickly reinforce unstable ground. Much faster than conventional drill and blast anchors.
Due to the unique hollow design, less material is used in the bar making them lighter than solid bars but without compromising strength. The hollow center also allows you to inject grout through the center of the bar. This helps to fill cracks and voids around the bore hole.
5. Corrosion Protection Options
Hot dip galvanizing per ISO 14 61
Epoxy Coating:
Ability to Bend: ISO 15 19
Impact Resistance: ASTM D27 94
Adhesion: ISO 24 09:2007
6. Customization Options
We offer customization services for R51 hollow self drilling anchor bars and accessories to suit your project requirements. Customization available:
7. FAQ
Q: What is an R51 hollow anchor bar?
A: The R51 hollow anchor bar is a self-drilling anchor used for tunnel, mining and geotechnical ground support. Drilling, grouting and anchoring can all be achieved with just one piece of equipment.
Q: What is the difference between an R51L and an R51N?
A: The R51L has a larger inside diameter and is lighter in weight. The R51N has a larger profile with thicker cross section and higher load capacities.
Q: Can grout be pumped through the anchor bar?
A: Yes. Due to the hollow center of the anchor bar, grout can be pumped through the body of the bar.
Q: What accessories are compatible with R51 anchor bars?
A: Some common accessories include nuts, coupling bolts, bearing plates, centralizers, and drill bit adapters.
Q: Is corrosion protection available for these bars?
A: Yes. We offer both hot dip galvanizing and epoxy coatings for projects that require increased corrosion resistance.
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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.
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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.
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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.
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