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The Mono-Strand Stressing Jack is a high-precision, single-strand hydraulic jack engineered for applying controlled tension to post-tensioning tendons in concrete structures-2-7. This specialized tool is a cornerstone of modern post-tensioning construction, enabling engineers to enhance the strength, durability, and span capabilities of concrete in projects ranging from high-rise buildings to major bridges-2-5. Designed to grip and tension a single steel strand—typically 12.7 mm (0.5") or 15.2 mm (0.6") in diameter—it works in tandem with strand wedge anchor systems to lock in the applied force permanently-2-3.
Operating on a robust hydraulic system, the jack generates immense force, often between 20 to 30 tons, to pull the strand-2-3. Once the target tension is reached, permanent wedges housed within the anchor head are seated to grip the strand. The jack then retracts, transferring the tensile force into the concrete structure as a beneficial compressive force, which significantly improves the concrete's load-bearing capacity and crack resistance-2.
Mono-strand jacks offer distinct benefits that make them indispensable on complex job sites:
Precision and Control: They allow for exact, calibrated tensioning of each individual tendon, which is critical for ensuring uniform stress distribution and meeting strict engineering specifications-2.
Compact and Lightweight Design: Compared to multi-strand systems, these jacks are relatively compact and lightweight, making them highly maneuverable and ideal for work in confined spaces or on elevated slabs where accessibility is a challenge-2-3-8.
Rugged Durability: Constructed from high-grade, hardened, and tempered alloy steel with corrosion-resistant finishes like hard chrome plating, they are built to withstand harsh job site conditions, including exposure to dirt and debris-1-3-6.
Operational Safety: Key safety features, such as integrated pressure relief valves, prevent over-pressurization during operation. Their design and testing often adhere to recognized standards like ASME, ensuring reliable performance-1-5-6.
System Versatility: A single jack can be configured to tension different strand diameters (e.g., 12.7mm, 15.2mm, 15.7mm) by using interchangeable components like nose cones and jack wedges-5-7. They are compatible with various wedge anchor systems and pocket styles-3.
Mono-strand jacks are available in various capacities and configurations to suit different project needs. The table below outlines common specifications based on industry-standard models:
| Specification | Common Range / Details | Key Considerations |
|---|---|---|
| Capacity | 20, 25, 27, 30 Tonne-1-3-7 | Select based on the ultimate breaking strength of the strand; a common safety practice is to use the jack at 80% of its rated capacity-1-6. |
| Stroke Length | 150mm, 200mm, 300mm, up to 1000mm-1-4-8 | Standard strokes (e.g., 200mm) suit most applications; long strokes (e.g., 750mm/1000mm) are for removing slack in very long tendons-4. |
| Compatible Strand | 12.7 mm (0.5"), 15.2 mm (0.6"), 15.7 mm-1-3-5 | Confirmed via interchangeable nose cones and gripping wedges-5. |
| Operating Pressure | Up to 700 bar / 10,000 PSI-1-5-6 | Requires a compatible high-pressure hydraulic pump-2. |
| Key Configurations | Front Gripping (OSFG): Grips strand in front for constrained spaces-4. Rear Gripping (OSRG): Grips strand at rear, often allows for longer strokes-4-6. Single/Double Acting: Double-acting models offer faster return cycles for high-efficiency work-3. | |
| Weight | ~15 kg to 40 kg (varies by capacity and stroke)-1-5-8 | Lighter models improve portability and ease of use on-site-8. |
Essential Accessories: For a complete, operational system, the jack must be paired with several key accessories-2-5:
A Hydraulic Power Pack with a calibrated gauge to supply and measure pressure.
Jack Wedges (e.g., MGJW13, MGJW15) sized to match the strand.
Nose Cones (e.g., GFNOSECONE15) and optional extensions for deep pockets.
Wedge Block for seating permanent anchors after stressing.
Mono-strand jacks are fundamental to post-tensioning applications across numerous sectors-2-7:
Building Construction: Creating post-tensioned slabs in commercial, residential, and high-rise buildings for longer spans and reduced material use.
Civil Infrastructure: Stressing tendons in bridge decks, girders, and in the construction of highways, metro systems, and railway projects.
Industrial & Special Structures: Reinforcing parking structures, stadiums, containment tanks, dams, and industrial floors.
Geotechnical and Mining: Used in slope stabilization, rock anchoring, and tunneling projects.
The Mono-Strand Stressing Jack is more than just a tool; it is a precision instrument that translates engineering design into real-world structural integrity. Its ability to deliver controlled, high-force tensioning to individual tendons makes it a critical component in the construction of safer, more efficient, and longer-lasting concrete structures.
For contractors and engineers, selecting the right jack—paired with a reliable strand wedge anchor system—is a direct investment in project quality, safety, and performance.
Ready to specify or integrate mono-strand stressing systems into
your project?
Contact our technical sales and engineering team today. We provide:
Expert Consultation to select the optimal jack model and capacity for your application.
Complete System Supply of jacks, power packs, and all compatible accessories, including wedge anchor components.
Technical Support & Drawings for seamless system integration.
Calibration & After-Sales Service to ensure long-term equipment performance and safety.
Submit your project specifications or request a detailed quote to get started.
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