Nord-Lock Group About Boltight Products Hydraulic Nuts

Boltight has been at the forefront of hydraulic bolt tensioning for over a decade. Our tensioning tools provide fast, accurate and safe solutions to tighten and loosen multiple bolts simultaneously.

Hydraulic Nuts

Hydraulic nuts enable large diameter bolts to be tensioned with ease to high and accurate preloads. A hydraulic pump activates the internal jacking system, so the effort required to tighten a very large diameter bolt is reduced to the effort needed to operate the pump.

As there is no nut rotation during tightening, the operation can be performed in a confined space and torsional stresses on thread damage are eliminated. Any number of hydraulic nuts can be connected together for simultaneous operation, ensuring all bolts in the joint can be evenly loaded to the same high and accurate preload.

Features

  • Available as bottom collar, top collar and shim type
  • Standard 1500bar and 2500bar designs
  • A20/A15 range
  • Substitutes original nut – combines tensioner and permanent nut
  • All in one solution – nut remains in place post tensioning
  • Special designs available
  • Supplied up to M400 in size (to date) – larger sizes quoted
  • High temperature solutions available

Advantages

  • Quick and easy to install
  • Even and accurate load as it is developed hydraulically
  • Low loss of initial load (shim)
  • No torque or torsion stress
  • No flogging hammers or spanners
  • Self-aligning (shim)
  • Improved fatigue performance
  • 100% simultaneous tension
  • Long life of internal jack - very compact and cost effective
  • Less stud protrusion required than for tensioners

Testing & Certification

Boltight is LRQA certified for quality and environmental assurance to ISO 9001: 2015. All tools are assembled, filled with oil and pressure tested prior to despatch.

More insights and references

Customer Cases Bespoke Bolt Tensioners Secure Deep-Water Pipelines Boltight supplies tailormade bolt tensioning equipment for structural split repair clamps to Subsea Innovation in the UK. Read more
Customer Cases Tightened Just Right In a 2006, American Bridge and Fluor got the assignment to build the new eastern span of the San Francisco–Oakland Bay Bridge, the largest public works project in California’s history. Read more
Knowledge Boltight TSR+ Sometimes you know that a very good solution can be further improved. But actually figuring out how to make a good product great can be difficult. Here’s how the faster, safer and more robust Bolti... Read more
Customer Cases Hydraulic Tensioning Tool For Nuclear Reactor Pressure Vessel Doosan Heavy Industries & Construction required a bolt tensioning solution to tighten nuclear reactor pressure vessel stud bolts. Read more
News Boltight embraces augmented reality tooling Have you ever wished you could try out a tool without the hassle of carrying it around on site? Now you can experience working with a tensioner and augmented reality directly from your mobile device. Read more
Customer Cases On site, offshore, under pressure Dutch company Heat Solutions on Site BV (HSOS) is a leading service provider in the metal sector. Their services include heat treatment and machining on site. Read more

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Boltight product range

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Boltight Boltight Subsea Tensioners Secure your Subsea applications with this nickel-plated tensioner designed to withstand high initial bolt stress. Read more
Boltight Boltight Typhoon Tensioners A compact tensioner to fit tight-access locations, this tool suits wind turbine applications Read more
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Boltight Boltight TSR+ Tensioners Ensure quick and safe operations with the fastest auto return tensioner to date. Read more
Boltight Boltight Xtra Range For higher loads and reduced dimensions, the Xtra range fits all Norsok compact Oil & Gas flanges Read more
Boltight Boltight Foundation Tensioners For wind base and foundation bolts, this tensioner is suitable for most common threadforms Read more
Boltight Boltight Hydraulic Nuts For permanent replacement when nuts are required Read more
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Boltight Boltight Accessories We offer a range of accessories for your applications including Pumps, Hoses, Connectors and Fittings Read more
Boltight Boltight Multi-Stud Tensioners Custom-designed for simultaneous tensioning, reducing time compared to individual tooling Read more
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Solutions for your industry

Boltight for Oil & Gas
Boltight for Subsea
Boltight for Power Generation
Boltight for Wind
Boltight for Industrial Sectors

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