Dextra Group | Reliable Connections

Close this search box.
My Dextra
Close this search box.

Expandable Friction Bolt | Expansion bolt

Clean and fast rock bolting solution

GEOTEC Expandable Friction Bolt (Expansion bolt) is a bolt made of a deformed steel tube which is expanded at the end of installation by injecting high-pressure water. It is especially recommended for the following applications:

  • Roof and wall bolting with irregular bore holes. The expanded tube will adjust the cavity’s shape.
  • No grouting or chemical required. Only high pressure water is required to expand the tube. No dirty grouting operation or chemicals required, this is especially recommended in case the ventilation in tunnel is limited.
  • Install and carry on! Instant anchor support is provided right after the tube is expanded.

Product features

Full system

Dextra provides a full
comprehensive system including
rod, plane and nuts.

Clean solution

No grouting, no chemical. Only
high pressure water is required to
expand the tube.

Instant support

Once expanded, the tube provides
its full support, letting you
continue the excavation right away.

Related solutions

Specific tunneling application of GFRP rebar cage allowing a TBM to break through a reinforcement cage in a minimum time.

Soil Stabilization: Fully cut-able FRP soil nail system used for the stabilization of slope.

Soil Retention: Post-tensioned steel ground anchor system used in excavation works.


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

Dextra holds physical stocks on several continents, complemented in each country by the local inventories of our distributors. With this extended network, Dextra makes sure our products are always at reach no matter where our partners are.

For solutions that require to be customized, Dextra can also go beyond our standard delivery times and offer accelerated delivery schemes. Consult us for more information.

From 3 major industrial sites located in Bangkok (Thailand), Guangzhou (China), and Pune (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.

An independently accredited material testing laboratory, accredited to ISO-IEC17025, is located at Dextra’s main Bangkok factory, allowing the testing of material and products.

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.

Contact us

   Share your information with us and we’ll get back to you as soon as possible.

Please enter your information