SUPERBOLT® – BOLT TIGHTENING FACILITATOR & MECHANICAL TENSIONERS
The Superbolt range, the world leader in multi-jackbolt tensioning (MJT), is an innovative solution that achieves high preload using small nuts (jackbolts) distributed around a main body, limiting the torque applied and facilitating installation. This technology has been proven in thousands of critical industrial assemblies.
Superbolt® Product Range
Multi-Jackbolt Tensioner
The Superbolt tensioner converts large nuts/bolts into low manual-effort systems without compromising reliability or performance.
It delivers controlled preload, secure installation, simplified maintenance and full adaptability to demanding environments.
Load-Sensing Tensioner
The Superbolt Load-Sensing Tensioner (LST) is a multi-jackbolt tensioner equipped with an integrated sensor, designed to measure the bolt preload in real time with high accuracy.
It is an Industry 4.0 solution that allows a standard nut to be simply replaced by an LST without modifying the existing structure.
Superbolt NXT | Multi-Jackbolt Tensioner
The Superbolt NXT is the modernized version of the multi-jackbolt tensioner (MJT).
It was designed to simplify and secure the tightening of large bolts by reducing the number of jackbolts required, while ensuring a precise preload of ± 10%.
How to properly use a Superbolt multi-jackbolt tensioner?
The Superbolt multi-jackbolt tensioners meet the high preload requirements of large-diameter bolted joints by distributing that preload into smaller torques using the pressure screws integrated into the body of the nut.
- When the pressure screws are tightened, a high axial thrust is generated and directed against a hardened washer.
- Loads are transferred to the nut body which is hand-placed on the main thread.
- A hardened washer is used to transfer the force while protecting the flange face.
- The axial thrust of multiple pressure screws and the opposing reaction force from the main bolt head create a high clamping force on the flange.
- The axial thrust of the pressure screw generates an equal reaction force in the main bolt.
Key Advantages of Superbolt® Products
Superbolt tensioners provide a simple and cost-effective method for tightening large-diameter bolts. They are designed to directly replace hex nuts and bolts or other fastening solutions.
Products in the Superbolt range offer numerous user benefits such as:
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Simplified installation: manual tools are sufficient, assembly and disassembly are easy, reusable.
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Controlled preload with precision: up to ±10% for NXT, ±5% for Load-Sensing versions.
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Enhanced safety: eliminates loosening under vibration or thermal cycles.
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Smart maintenance: connected versions enable remote monitoring and predictive maintenance.
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High versatility: available across a wide range of diameters, pressures and temperatures, with advanced customization capability for complex cases.
NORD-LOCK GROUP, HUB OF INNOVATION AND ENGINEERING
Nord-Lock Group provides the essential technologies to meet your bolting challenges.
In 1982, the original Nord-Lock® wedge-locking technology, which truly secures bolted assemblies, was developed.
Since then, our range of assembly technologies and expertise has become the most comprehensive on the market, integrating mechanical tensioners Superbolt®, hydraulic tensioners Boltight® and shafts Expander®.
All solutions are developed and manufactured in-house, ensuring they meet the highest industry standards. Our dedicated team of experts works closely with customers worldwide.
Superbolt® — designed for your bolted-assembly challenges.
Superbolt was the world's first to revolutionize nuts and bolts with the multi-jackbolt tensioner (MJT).
Invented in Pittsburgh (USA) in 1984, this technology has since proven itself in thousands of successful installations around the world.
As a testament to its commitment to quality, Superbolt is certified ISO 9001:2015.
More recently, the Superbolt Tool received the prestigious Red Dot Award for "Best Product Design 2020" in the Innovation category.
Superbolt understands that each industry has its own challenges; that is why their broad product range includes solutions for your specific needs, and they continue to develop a wide array of solutions to address the bolting challenges of future generations.
Whether you need to replace existing bolts to achieve a precise preload safely, want to increase bolt or stud fatigue resistance, work with rotating couplings, or require a restricted-access application, there is a Superbolt® solution.
The Nord-Lock Group brand also offers tensioners with integrated smart technology that enables you to monitor preload remotely.
Creating sufficient load on large bolted assemblies
For large bolts, it becomes increasingly difficult to generate sufficient load using torque-based tightening methods.
Many traditional techniques can lead to serious problems, including injuries, inaccurate preload, thread damage, difficult disassembly, high equipment costs and excessive downtime.
Splitting the torque into multiple manageable forces
Superbolt multi-jackbolt tensioners (MJT) achieve very high preload and exceptional accuracy by dividing the torque into several manageable forces using the jackbolts and the nut body. Your assemblies can be retightened without requiring specialized skills or heavy tooling.
Only simple hand tools are required for installation. The operation is quick, safe and efficient.
Need a customized solution for a specific requirement?
When off-the-shelf parts simply won't do the job, you can rely on Superbolt®'s dedicated engineering teams to share their experience, knowledge and creativity to design a solution that meets the specific requirements of your application.
They design and manufacture special products up to 1500 mm in diameter and solutions for operating temperatures up to 700 °C (1292 °F).
Their custom solutions can also be developed from pre-engineered products, combine multiple technologies, or be integrated into the design of other components.
SUPERBOLT® LIBRARY :
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