Steel Combination Bolt

Steel Combination Bolt

Immediate and permanent rock bolting solution

GEOTEC™ Steel Combination Bolt is suitable for the most stringent requirements. A mechanical bolt combined with a corrugated pipe and a double grout layer all along tendon to provide both high bonding and protection against corrosion (similar to Double Corrosion Protection / DCP).

It is initially installed for immediate support by the use of an expansion shell, to be fully grouted at a later stage allowing it to be classified as permanent application.


Product features

  • Available for boreholes from 45mm to 68mm.
  • Full range of expansion shells available to adapt to a variety of ground conditions.
  • Dual anchorage: punctual + full encapsulation.
  • Difference types of coating against corrosive environment.
Shell range
Shell range
Available for every ground conditions.
Dry solution
Various applications
Such as roadways, hydropower and underground oil/gas storage, sub-sea and sewer tunnels
Instant support
Instant support
Once expanded, the shell and rod provide a full anchor, letting you continue the excavation right away.


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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