Overview
How it works
Our GFRP rockbolts are made from high-strength glass fiber and resin, cured at high temperature into a solid bolt. The thread runs along the full length – left- or right-hand – typically with a 10 mm pitch and a rounded thread form.
Once installed and bonded with anchoring resin, the bolt locks into the surrounding ground. Working together, bolt and rock mass redistribute stress, stiffen the ground and raise its resistance to deformation – increasing its load-bearing capacity. Because the bolts can be cut easily, they are ideal for temporary support in tunnel faces and soft eyes.
Technical data
Technical parameters
Da – outer diameter · P – thread pitch · L – length
| Size | Tensile loadkN | Cross-sectionmm² | Load · FRP nutkN | Load · steel nutkN | Load · FRP platekN | Core strengthN/mm² | TorsionN·m | Weightg/m |
|---|---|---|---|---|---|---|---|---|
| Ø16 | 140 | 185 | 40 | – | 40 | 757 | – | 385 |
| Ø18 | 160 | 234 | 40 | – | 40 | 684 | – | 490 |
| Ø20 | 220 | 289 | 60 | 80 | 60 | 761 | 60 | 590 |
| Ø22 | 240 | 355 | 60 | 100 | 60 | 676 | 70 | 710 |
| Ø24 | 250 | 430 | 70 | 100 | 70 | 581 | 80 | 903 |
| Ø25 | 342 | 441.5 | 70 | 120 | 70 | 775 | 120 | 930 |
| Ø27 | 400 | 530 | 70 | 120 | 70 | 755 | 130 | 970 |
| Ø28 | 430 | 553.9 | 80 | 120 | 80 | 776 | 140 | 1160 |
| Ø32 | 550 | 737 | 80 | 150 | 80 | 746 | 200 | 1520 |
| Ø36 | 600 | 960 | 100 | 150 | 100 | 625 | 280 | 1900 |
| Ø40 | 750 | 1163 | 100 | 150 | 100 | 645 | 320 | 2400 |
Tensile modulus40 GPa
Double shear strength150 MPa
Strain at failure2%
Thread pitch10 mm, right hand
Diameter tolerance± 0.5 mm
End cut90°
Length tolerance± 10 mm
Straightness< 3 mm/m
Compared with steel
Key advantages
- Light weight
- High tensile strength
- Corrosion resistant
- Anti-static
- Easy to cut on site
- No electrical or thermal conductivity
- Flame resistant
- Continuous thread profile
- Flexible
- Wide choice of diameters
Enquire about GFRP Rockbolt
Share sizes, quantities and your project location – we will reply with availability and pricing.