1.Technical Specifications
| Item | Specification |
| Product Type | Split Set Friction Rock Bolt / Friction Stabilizer |
| Outer Diameter | 42mm |
| Initial Anchorage Force | 3-7 tons |
| Ring Pull-Off Load | 8-10 tons |
| Tensile / Breaking Capacity | 12-13 tons |
| Available Lengths | 1200mm, 1500mm, 1800mm, 2000mm, 2500mm |
| Material Options | Q235, 16Mn, 20MnSi |
| Application | Mining, tunnel support, underground engineering, rock reinforcement |
2. Size Reference
| Outer Diameter | Weight | Bolt Length | Minimum Ultimate Tensile Strength | Suggested Initial Load | Recommended Drill Hole Diameter |
| 33mm | 1.64 kg/m | 0.46-2.4m | 89 kN | 27-54 kN | 30-33mm |
| 35mm | 1.64 kg/m | 0.46-2.4m | 89 kN | 27-54 kN | 32-35mm |
| 39mm | 1.77 kg/m | 0.46-3.0m | 111 kN | 27-54 kN | 35-38mm |
| 46mm | 2.79 kg/m | 0.91-3.65m | 151 kN | 54-89 kN | 42-45mm |
3. Uses
Split set friction rock bolts are commonly used in applications such as:
Coal and ore/mineral underground mines
tunneling excavation projects and tunnel support/rehabilitation
Roadway, railways and metro projects
Hydropower, communication and utility tunneling
Slope stabilization projects and rock reinforcement
Foundation support and repair
4. Product Structure
Split set friction rock bolt is mainly made up of slit steel tube, bearing plate and accessories. It is hammered into the pre-drilled hole with smaller diameter. During driving in process, the tube is squeezed tightly and exerts constant radial force against the wall of hole. In addition, there exists frictional resistance along the entire length of bolt.
Split set friction rock bolt works quickly to enhance the strength of rock mass and limit deformation of underground opening.
5. FAQ
5.1 What is a split set friction rock bolt used for?
Split set rock bolts are commonly used for ground and rock support in mines, tunnels, slopes and underground civil engineering projects.
5.2 Do I need resin or grout for a 42mm split set bolt?
For typical friction rock bolt applications no resin or grout is necessary as the bolt installs using friction between the steel tube and the borehole wall.
5.3 What types of materials do you have available?
The most common types of materials are Q235 steel, 16Mn steel, and 20MnSi steel.
5.4 What length options are available for the 42mm bolt?
Common lengths are 1200mm, 1500mm, 1800mm, 2000mm and 2500mm.
5.5 What keywords should I target for this page?
Try targeting “42mm split set rock bolt”, “friction rock bolt”, “split set bolt”, “mining rock bolt” and “tunnel support bolt”.
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