What Is a 24mm Fiberglass Rock Bolt?
The 24mm fiberglass rock bolt is a ground-support element used in mining, tunneling, and civil construction. It is made from fiberglass reinforcement embedded in a thermoset resin matrix, so it is non-conductive and resists corrosion in damp or chemically aggressive ground. Full-length threading helps the bolt grip the borehole wall when installed with resin or mortar.
These bolts are often selected where steel may create handling, corrosion, or electrical hazards. They can be cut with standard mining or tunneling equipment, which can reduce the risk of damaging cutting tools compared with steel bolts of equal diameter.
Technical Details
| Feature | Description |
|---|---|
| Diameter | 24 mm nominal |
| Material | Fiberglass reinforcement with resin matrix |
| Thread | Full-length threading |
| Hole Size Needed | 26-28 mm |
| Common Lengths | 1 m, 1.5 m, 2 m, 2.5 m, 3 m (custom lengths available) |
| Weight | About one-third the weight of an equal-diameter steel bolt |
| Color | Typically tan or light yellow |
| Temperature Range | Suitable for cold and hot climates; confirm resin grade for extreme temperatures |
Where You Can Use These Bolts
Mining
- Support for mine roofs and walls
- Areas where bolts may need to be cut later
- Wet or damp sections where corrosion is a concern
- Locations near electrical equipment
Tunneling
- Support during tunnel construction
- Areas where water is present
- Sections with signal or electrical systems
- Temporary support that may later be removed
Construction and Civil Works
- Holding slopes in place
- Supporting retaining walls
- Coastal or waterfront projects
- Areas with corrosive soil or water
Why Choose Fiberglass Over Steel?
Corrosion Resistance
Fiberglass rock bolts resist corrosion from groundwater, salts, and many chemicals better than bare steel bolts. This can help extend service life in wet or aggressive ground conditions.
Lightweight Handling
Because a 24mm fiberglass rock bolt weighs about one-third as much as an equal-diameter steel bolt, workers can carry and install more bolts per shift with less fatigue.
Non-Conductive
Fiberglass does not conduct electricity. This makes these bolts suitable for use near electrical equipment, rail systems, or areas where stray currents are a concern.
Cuttable
When tunnels are advanced or openings are enlarged, fiberglass bolts can be cut through with less risk of damaging cutting tools than steel bolts of equal diameter.
What Comes in a Complete System
| Part | What It Does |
|---|---|
| Fiberglass Bolt | The main support element |
| Washer | Helps spread out the pressure |
| Plate | Bears against the rock surface |
| Nut | Holds the assembly in place |
| Resin or Mortar | Bonds the bolt to the borehole wall |
Frequently Asked Questions
What is the tensile strength of a 24mm fiberglass rock bolt?
Tensile strength depends on the glass content, resin system, and manufacturing standard. Contact us for the test reports and load ratings for the specific bolt grade you need.
What is the shear strength of a 24mm fiberglass rock bolt?
Shear strength varies with resin type, fiber architecture, and production process. We can provide project-specific mechanical data on request.
Why use a 24mm fiberglass rock bolt instead of a 24mm steel bolt?
A 24mm fiberglass rock bolt is about one-third the weight of an equal-diameter steel bolt, non-conductive, and resistant to corrosion. It can also be cut more easily, which can reduce wear on cutting equipment in mechanized excavation.
What are the dimensions of a 24mm fiberglass rock bolt?
The nominal diameter is 24 mm with full-length threading. Standard lengths commonly range from 1 m to 3 m, and longer or custom lengths are available on request.
How is a 24mm fiberglass rock bolt installed?
Drill a hole to the required diameter and depth, insert the bolt with the specified resin or mortar cartridge, rotate to mix the bonding agent, allow curing according to the resin manufacturer’s instructions, then install the plate and nut and tension as required.
What applications use 24mm fiberglass rock bolts?
These bolts are used for tunnel face support, mine roof and wall support, slope stabilization, retaining walls, dam anchors, and foundation improvement in mining, tunneling, and geotechnical projects.
Is a 24mm fiberglass rock bolt TBM compatible?
Yes. Fiberglass bolts can generally be cut by tunnel-boring-machine cutters with less risk of damaging cutters than steel bolts, which can help reduce downtime during mechanized tunneling.
Does a 24mm fiberglass rock bolt corrode?
Fiberglass rock bolts resist corrosion from groundwater, salts, and many chemicals. The actual service life depends on the ground conditions, resin system, and installation quality.
Related products: browse our FRP rebar for concrete reinforcement, pultruded structural profiles, and pultrusion machines and custom pultrusion dies used to manufacture them.
Compare all diameters on the main FRP rock bolt page, including TBM-cuttable options for mechanized tunneling.
Need ground support for mining or tunneling? Request a B2B quote for 24mm fiberglass rock bolts and related FRP reinforcement products. Contact us for a quote for your project.
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