We are the High Strength Rock Bolt Manufacturer
Main Components:
Self-drilling Anchor System Consists of five basic components:
- One Or More Steel Hollow Bar
- One Or More Extension Coupling To Connect The Hollow Bars
- A Steel Plate
- A Steel Nut
-A Sacrificial Drill Bit
Introduction to SDA
The self-drilling hollow anchor system performs drilling, anchoring and grouting in one step. It allows air and water to freely pass through the bar during drilling to remove debris and then allows the grout to be injected immediately after completely covering the entire bolt.
Features and Advantages
No predrilling
Rock at any depth
Can be installed in all soil types
Casing for lateral loads
Grout and bar are installed simultaneously
Only need rock drill & grout plant
Internal Quality Control System
Inspection ratio for anchor bars:
| Test Items |
Sampling Ratio |
| Pull Test |
≥5% |
| Dimension Inspection |
=100% |
| Thread Inspection |
=100% |
| Surface Inspection |
=100% |
Inspection ratio for anchor bars:
| Test Items |
Sampling Ratio |
| Thread Inspection |
=100% |
| Hardness Inspection |
=100% |
| Surface Inspection |
=100% |
| Dimension Inspection |
≥10% |
Technical Data Sheet
| R38 HOLLOW BAR |
| Specification |
R38N-21 |
R38N-19 |
| da(mm) |
38 |
38 |
| di(mm) |
21 |
19 |
| P(mm) |
12.7 |
12.7 |
| Ultimate Load(KN) |
500 |
500 |
| Yield Load(KN) |
400 |
400 |
| Weight(Kg/m) |
4.8 |
5.5 |
| Thread Type |
ISO 10208 |
| Type of Steel |
EN 10083-1 |
| Thread Type |
Left Hand / Right Hand |
| Option of Anti-Corrosion |
Hot-dipped Galvanization Standard |
| Painting Coating |
| Epoxy Coating |
| Length(m) |
1 m, 1.5m, 2m, 2.5m, 3m, 3.5m, 4m, 4.5m, 5m, 5.5m, 6m |
Audited Supplier 
Audited Supplier 
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