Superbolt was the world’s first to revolutionize nuts and bolts with multi-jackbolt tensioning (MJT) technology. Our technology has been proven in tens of thousands of successful installations and we continue to develop a multitude of solutions to solve the next generation of bolting challenges.

Multi-Jackbolt Tensioning

Superbolt multi-jackbolt tensioners (MJTs) take the high preload requirements in large diameter bolting and break it down into manageable torques using the jackbolts threaded through the nut body.

 

How it works

  1. By tightening the jackbolts, a strong thrust (axial) force is generated and directed against a hardened washer
  2. The loads are transferred through the nut body, which is positioned on the main thread by hand
  3. A hardened washer is used to transfer the force while protecting the flange face
  4. The thrust (axial) force of many jackbolts and the opposite reaction force of the main bolt head create a strong clamping force on the flange
  5. The thrust (axial) force from the jackbolt creates an equally strong reaction force in the main bolt

 

Advantages

  • Tremendous clamping force available
  • Low torque requirement – only hand tools needed
  • Safe method for installation personnel
  • Quick installation and removal
  • Tightens stud/bolts using pure tension
  • Tensioner flexibility adds elasticity to studs/bolts to create a better bolted joint
  • Fits in restricted areas
  • Provides even tension from stud to stud
  • Accurate within 10% of specified bolt tension

 

Expansion Sleeve Coupling Bolts

Superbolt expansion bolts are truly fitted into the hole due to the radial expansion of the conical bore sleeve.

By design, accurate radial force combined with the known axial clamping load, provides total protection against coupling slippage and thus prevents bolt and hole damage during subsequent removals. 

The expansion bolts can be retrofitted to replace traditional interference or force fitted bolts, reliably and cost-effectively.

How it works

By pulling a taper body bolt through a taper bore sleeve, the sleeve expands to completely fill the coupling hole, becoming a truly fitted bolt.

 

Advantages

  • Truly fitted bolt with radial expansion
  • Safe, reliable and easy installation and removal
  • No coupling slippage
  • No hole damage or re-machining
  • Easy retrofit package
  • Compact, ergonomic tooling
  • Accurate maintenance scheduling

Are you looking for?

Superbolt product range

Superbolt Superbolt NXT Multi-Jackbolt Tensioners Expect 30% faster installments with the world's easiest-to-use multi-jackbolt tensioner Read more
Superbolt mechanical tensioners are quick to install and remove Superbolt Superbolt Multi-Jackbolt Tensioners Replace or retrofit existing bolts to safely achieve accurate preload Read more
Flexnuts are reactive nuts designed to be used with Superbolt tensioners for through-hole applications Superbolt Superbolt Flexnuts Relieve stress concentrations and increase fatigue life of the bolt or stud Read more
Superbolt EzFit expansion bolts are designed for couplings that require bolts to transfer forces in shear Superbolt Superbolt EzFit For rotating couplings that require bolts to transfer forces to shear Read more
Superbolt Superbolt HyFit Hydraulically actuated, truly fitted, expanding coupling bolt Read more
Superbolt Superbolt Tool Apply torque fast and accurately to multiple jackbolts Read more
Superbolt Superbolt Load-Sensing Tensioner Tensioner with built-in preload monitoring system Read more
Superbolt Superbolt Load-Sensing Flexnut Use built-in sensors to automatically measure and communicate preload values for remote monitoring Read more
Custom designed Superbolt solutions for your unique bolting requirements Superbolt Superbolt Customized Solutions Custom designed bolting solutions for your unique application requirements Read more

Customer success stories

Bolted Bolt Maintenance with Huge Potential – how Nord-Lock Group works with Hydropower MRO Solve coupling alignment, secure bolts and mitigate the risks of extreme vibrations with Nord-Lock Group’s expertise in hydropower and turbine bolt maintenance. Read more
subperbolt-ezfit Customer Cases Ensuring alignment on hydropower turbines Coupling alignment is key for the smooth operation of hydropower turbines, however, many plants are forced to schedule frequent maintenance due to misalignment. When a hydropower plant in Vietnam w... Read more
Customer Cases Imagining the successful solution in your mind Like a winning athlete, can a maintenance manager see the perfect fix in his mind before actually doing it? Japan Steel Works might have the answer. Read more
Customer Cases Solving a Pressing Issue with Superbolt Tensioners From hydropower generation facilities to bookbinding press, the usability of Superbolt multi-jackbolt tensioners transcends across different types of applications to keep bolted connections firmly together. Read more
Customer Cases Alstom and Nord-Lock Group: A secure coupling French multinational Alstom is a global player in the rail transport industry with a raft of international customers seeking the most comprehensive range of products and services on the rail market. Read more
Customer Cases Swivel shackle with impressive lifting power The Swivel Shackle Giga DSS from Codipro incorporates a Superbolt tensioner. This is the most efficient lifting ring ever made and can handle turning loads. Read more
Customer Cases Looking deep into the stars The Large Binocular Telescope (LBT) on Mount Graham in Arizona, USA, is already one of the world’s most advanced optical telescopes. It consists of two 8.4-meter primary mirrors on a common mount s... Read more
Customer Cases Converting Sea Wave Motion Into Energy With oceans covering more than 70 per cent of the earth’s surface, wave power is potentially a huge untapped source of renewable energy. Read more
Customer Cases Pressing problem solved with Superbolt Superbolt tensioners secure Sodick's moulding machines allowing to control the force on the joints and guaranteeing optimal performance of the machines. Read more
Customer Cases The wind turbine time machine With the sector growing globally every year, the wind energy industry is looking to use less material for producing big wind turbine parts. Read more
Customer Cases Taking wind energy to new depths Offshore wind turbines are an increasingly common sight as the world moves towards more sustainable forms of energy production. Read more
Customer Cases Fusion Power Swiss Plasma Center's problems with vertical, horizontal and axial vibrations are solved with the installation of Superbolt expansion bolts. Read more
Customer Cases Superbolt tensioners secure slurry pump cover Two sets of hydraulic wrenches were used previously, with one used to achieve 21,000 lb•ft (28,470 Nm) on the 16 perimeter bolts and another used to achieve the 35,000 lb•ft (47,450 Nm) for the cut water bolt. Read more
Customer Cases Towering challenge for a giant crane Challenges are nothing new to Terex Tower Cranes, an Italian-based manufacturer of cranes for construction and industrial use founded (as Comedil S.r.l) in 1962. Read more
Customer Cases China: Opportunities on the coal market Xi’an Coal Mining Machinery has approved Nord-Lock washers and Superbolt tensioners as specialised components for its shearers and roadheaders. Read more
Customer Cases Ecuador's new power Ecuador already meets 45 percent of its energy needs with hydroelectric power, but is aiming to increase this to 93 percent by 2016. Read more
Customer Cases Superbolt tensioners secure Tata Steel’s BOS converters The Tata Steel’s Port Talbot Basic Oxygen Steelmaking (BOS) plant in South Wales produces some 4.5m tonnes of strip steel a year, making it one of the largest plants in Europe. Read more
Customer Cases Tensioners on Alcoa 50,000-ton press When Alcoa decided to redesign and rebuild their iconic 50,000 ton press located in Cleveland, OH, they contacted Superbolt to design specialty tensioners that could handle the demanding bolting requirements. Read more
Customer Cases A charge from the Alps Backdropped by the Alps, a Swiss power plant has solved the problem of storing electricity. Read more
Customer Cases Giant hammer Driving a pile into the ground involves lifting a 6,000 kg (13,200 pound) weight and accelerating it from a 150 cm (five feet) height, creating a 105 kilojoule force (78,000 foot pound) collision –... Read more

Secure connections

Looking for the right solutions for your bolting needs?

Get more than just the products you need Technical support Let us help you solve your bolting challenges Contact us

Select your country