Holding Down Bar Systems

Holding Down Bar Systems

Restraint system for bridges and viaducts

High Tensile Holding Down Bars are a special application for smooth Post Tensioning bar systems for the connection between steel and concrete elements or concrete to concrete elements.

The bars are typically used vertically for the holding down of structures or structural elements to concrete foundations.

Each bar tendon is typically terminated via a nut bearing onto steelwork or a steel plate. In order to eliminate bar stretch and hence movement under externally applied loads, the bar is usually tensioned using a hydraulic jack.


A type of anchorage to connect steel to concrete, or concrete to concrete elements

  • Typical applications include the holding down bars for bridges, viaducts, foundation works, offshore platforms, and towers.
  • Diameters range from 31mm (thread M33) to 100mm (thread M103).
  • 3 steel grades are available: 835/1030, 930/1080 and 1050/1200.
  • Rolled threads (obtained with cold plastic deformation of the metal between two dies) optimized for fatigue performance.
  • ISO metric thread as per ISO 965-1.
  • For corrosion protection, a protection cap can be supplied which bolts onto the end bearing plate over the bar end, nut and washer.


Wide range
Wide range
3 steel grade available in 12 diameters.
Engineering support
Engineering support
Dextra engineers available for support and advice
Full Traceability
Full identification from drawing to individual part labelling.
holding down bar


  • High ductility, fatigue resistance, impact resistance.
  • Full traceability and individual bar labelling.
  • Ready-to-install conditions.
  • Sea-worthy packing.
  • Project engineering support by Dextra dedicated Bar Systems Engineering team.


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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