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What is bolt tensioning?

Precision Hydraulic Bolt Tensioning Solutions

Hydraulic bolt tensioning operates by applying hydraulic pressure to axially stretch the stud until it contacts the flange.  Once the pressure is released, the bolt behaves much like a spring, holding the required clamping force for the applied load.  This method eliminates the need to manually create torque and friction, reducing physical effort while ensuring greater accuracy and precision in tensioning.
 
Hydraulic bolt tensioning technology provides the highest level of accuracy, productivity, and safety on critical joints. Bolt tensioning can eliminate “cross-talk” and deliver simultaneous bolt load and gasket compression across the entire joint. Tensioning also drastically reduces the likelihood to gall threaded fasteners, avoiding potential delays and rework.

Hydraulic Tensioning vs Torque Tightening: Which is Better?

Hydraulic Tensioning uses controlled pressure to axially stretch the bolt, creating a precise "spring" load. This method eliminates "cross-talk" and thread friction, ensuring unmatched accuracy, faster disassembly, and superior on-site safety.

Torque Tightening relies on rotational force, which creates massive reactive forces and surface friction. This often leads to galling threaded fasteners, uneven joint loading, and increased risks of hand injuries and critical path delays.

Our unique systems improve efficiency and safety across all types of bolt tensioning applications.

Hydraulic bolt tensioner
Technofast delivers advanced systems that significantly outperform traditional manual torquing in speed and reliability.
 
By applying direct axial load to create precise bolt stretch, our solutions eliminate the friction variables and repetitive loading cycles that slow down major projects.
 
This ensures a consistent clamping force and the exact bolt preload required for critical industrial connections, allowing for a faster return to service.
We provide specialised controlled bolting and integrity solutions across the world’s most demanding sectors. 
 
Technofast expertise is essential for the high-torque, fast-turnaround environments of mining and quarry sites, steel mills, and sugar industry processing plants.
 
Our reach extends to mission-critical infrastructure in wind energy, power generation, oil and gas, and the petrochemical industry, as well as the strict sanitary standards of the food and beverage sector.

Beyond simple fastening, our systems are designed to protect the long-term health of your machinery.

By ensuring accurate tensioning from the initial build, we mitigate the primary causes of asset failure, such as bolt relaxation, vibration loosening, and fatigue.

This strategic approach to asset lifecycle management reduces the frequency of intrusive repairs and extends the operational window for equipment in subsea, offshore, and high-vibration environments.

The true cost of a connection isn’t the hardware; it’s the downtime, leaks, and rework caused by inaccurate loading. 

Technofast eliminates these risks by providing an integrated approach to structural integrity.

By combining our advanced controlled bolting systems with ultrasonic bolt measurement, we ensure every axial load and yield strength requirement is verified on-site.

This precision protects your budget from the massive expenses of unplanned maintenance, bolt galling, and catastrophic asset failure.

All Technofast equipment and methodologies are engineered to meet or exceed rigorous PCC-1 bolting standards for pressure vessels and pipeline flanges.
 
Our focus on load-sensing technology and advanced metallurgy prevents bolt galling and thread deformation.
 
This commitment to reliable, fast execution makes our systems the preferred choice for high-stakes environments like power generation maintenance and nuclear reactor bolting.

How does it work?

person using a large spanner to tighten a bolt

There are a number of different tooling designs using the basic hydraulic “direct tensioning” principle. Depending upon the application needs, these can take the form of:

  • The hydraulic nut — where the item remains in place.
  • A bolt tensioner — which applies the tensioning force but is subsequently removed from the job.
  • Any number of tailored solutions including Technofast’s high temperature products, such as EziTite TR Hydraulic Nuts or CamNut Systems.

In all of the products, the hydraulic pressure is produced externally by standard pumping equipment and directed to create the ideal force specified to load the subject bolt to its ideal tension.

By using the Direct Tension method, operators can avoid over-tensioning bolts, avoid galling of threaded fasteners, and avoid the need for rework whilst improving the efficiency of the operation and offering much improved safety for operators.

For EziJac Bolt Tensioners, the operation is similar. The Bolt Tensioner is built as a tool of modular components and is removed from the job after the tensioning operation is complete.

Install the tool onto the bolt

First, install the EziJac bolt tensioner or EziTite nut onto the bolt and connect the hose.

Activate the Pump

Activate the pump so that hydraulic oil flows into the load cell.

Load Generated

The load is generated within the sealed internal surface area of the tool or hydraulic nut and the force is transferred directly to the subject bolt.

Lock The Nut

The nut rotator/lockring can then be engaged to mechanically lock the load onto the bolt.

Release The Pressure

Release the pressure, disconnect the hose, and removed the tool. Tensioning is complete.

What are the benefits of using a Direct Tension hydraulic method?

It’s Safer

Eliminate physical exertion and keep your operators safe — they no longer need to use hammer tightening methods or hold torque tools in place during operation.

It’s Efficient

Eliminate physical exertion and keep your operators safe — they no longer need to use hammer tightening methods or hold torque tools in place during operation.

Less Physical Exertion

Technofast products use hydraulic pumps to generate bolt force, eliminating the need for physical labour and manual tightening. This thereby requires less physical exertion from your team and creates greater safety for your workers on-site. These products can prevent exertion-related injuries.

Better Accuracy

These products remove the need for repeated ‘star pattern’ tightening cycles needed for torque tensioning tools. Ideally, all bolts are tightened simultaneously from one pressure source. This allows a perfect balance of force across all bolts in the joint so that no bolt carries more or less load than others in the pattern.​

Innovation solutions for your industry.

Technofast Industries is an worldwide leader and specialist in Bolt Tensioning, providing innovative and effective technical solutions along with uncomprising customer service.

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