Conveyor Idler Roller | Belt Conveyor Roller for Mining and Bulk Material Handling
Conveyor Idler Roller | Belt Conveyor Roller for Mining and Bulk Material Handling
1.Technical Specifications
| Item | R38N/21 | R38N/19 |
| Outer Diameter mm | 38 | 38 |
| Inner Diameter mm | 22 | 19 |
| Cross Section Area mm2 | 611 | 700 |
| Ultimate Load kN | 500 | 500 |
| Yield Load kN | 400 | 400 |
| Weight kg/m | 4.8 | 5.5 |
| 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 50 mm, length 60 mm, hardness HRC 25-30, steel CK45, ISO10208 thread, weight 0.25 kg |
| Coupler | Outer diameter 52 mm, length 40 mm, hardness HRC 23-30, steel EN10083-1, ISO10208 thread, weight 1.8 kg |
| Bearing Plate | 200 x 200 mm, thickness 12 mm, hole diameter 41 mm, weight 3.6 kg |
| Centralizer | Outer diameter 72 mm, length 41 mm, hole diameter 50 mm, steel CK45, weight 0.3 kg |
| Drill Bit Adapter | Anchor thread R38, drill bit thread R51 / T52 / T73 / T76, length 50 mm, weight 0.1 kg |
3. Applications
R38 self-drilling hollow anchor bars can be used in many underground and surface construction projects. Common uses include:
4. Advantages
Self-drilling hollow anchor bars simplify the construction process since they work as a drill rod and grouting pipe. Fewer steps are required for installation which reduces project time. Also, since conventional anchoring involves drilling the borehole first and then installing the anchor; there is risk of borehole collapse when working in unstable ground conditions. The self-drilling anchor system eliminates this problem.
Pressure grouting can be performed by injecting grout through the hollow body of the anchor bar. The grout fills up any cracks or voids in the ground around the borehole. This increases bonding strength between the ground and anchor; improves corrosion protection on the thread exposed to the ground; and helps maintain long-term stability.
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 R38 hollow self-drilling anchor bar?
A: Drill rod and grouting pipe all in one. Connect nut, insert into ground then drill and grout into place. Commonly used for tunnel support, mining support and geotechnical anchorage applications.
Q: What is the difference between R38N/21 and R38N/19?
A: The outer diameter and ultimate load value are same. The inner diameter of R38N/19 is smaller than R38N/21. So the cross section area and weight per meter of R38N/19 are bigger.
Q: Can you inject grout through the R38 hollow anchor bar?
A: Yes! The center is hollow so you can inject grout through the anchor body.
Q: What types of accessories are available for these anchor bars?
A: Available accessories include nuts, couplers, plates, centralizers and drill bit adapters.
Q: Does rust preventions options are available?
A: Yes. Hot dip galvanizing and epoxy coating options are available.
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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.
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.
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