FRP Hollow Rock Bolt

FRP Hollow Rock Bolt

Cuttable rod and grouting pipe in one!

GEOTEC FRP Hollow Rock Bolt is a rock-bolting system based on fully threaded hollow GFRP bars.

It is especially designed for the following applications :

  • Face-bolting and temporary applications : Cut-ability of FRP makes it the ideal solutions for face bolting or any other tunneling/mining application where further excavation is required.
  • Cohesive Soil & Hard Rock conditions. GEOTEC are inserted into pre-drilled hole. For non-cohesive soil environment, refer instead to FRP Self-Drilling Bolts.
  • Installation with grout. The hollow GFRP anchor rod also acts as a grouting pipe to ease installation.

Product features

  • 2 in 1 system = Act as both anchor rod and grouting pipe.
  • Standard range available in 4 diameters ranging from 25mm to 38mm.
  • Can be delivered with GFRP (cut-able) or steel plate and nuts.
  • Additional high performance ASTEC model available in 32mm with body tensile loads ≥480 kN. Delivered with Domed Plate & Nut, making system suitable for installation on uneven surfaces.
  • Designed as per BS EN 1997-1; BS EN 1537 and BS 7861-1.
Hollow rod
Hollow rod
Acts as a grouting pipe to simplify installation process.
Cuttable system
Cuttable systems
By standard earth moving and mining equipment, including the plate/nuts accessories!
Light weight
Light weight
Easy handling, transportation and installation inside the tunnel.


At every moment of your customer journey, Dextra teams dedicate themselves to the making of smart construction solutions that allow our customers to reach higher productivity and safety level on their construction sites.

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Network & Services

Network - Dextra holds physical stocks on several continents, complemented in each country by the local inventories of our distributors. With this extended network, Dextra make sure our products are always at reach and available in reasonable times.

Delivery - For solutions which required to be customized for each project, Dextra can also go beyond our standard delivery times and offer accelerated delivery schemes. Consult us for more information.

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Manufacturing capabilities

From 3 major industrial sites located in Bangkok (Thailand), Guangzhou (China) and Mumbai (India), Dextra completely owns its manufacturing facilities and processes. This allows us to have complete control over the timing of our operations and the quality of the solutions produced.

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Testing facility

An independently accredited material testing laboratory, accredited to ISO-IEC 17025, is located at Dextra’s main Bangkok factory, allowing the testing of material and products.

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Quality & Certifications

Dextra aims to supply products that exceed the most demanding international technical approvals and it is our goal to create maximum customer satisfaction by complying with our clients’ needs and specified requirements.

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