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Boltight Typhoon Bolt Tensioners

Boltight Typhoon Bolt Tensioners offer a high-load, low profile solution for space-restricted applications demanding high and accurate preloads, such as wind turbines.

Boltight Typhoon Hydraulic Tensioners exert a high load with both the multi-stage, ideal for radial obstruction applications and the single stage, for vertical obstruction applications.


  • Designed for high loads – up to 95% yield stress for 10.9 bolts
  • Spring loaded gear drive for nut rotation
  • Automatic piston retraction and positive stop facility
  • Single stage design for vertical obstruction applications
  • Internal fail safe mechanism
  • Multi stage design for radial obstruction applications
  • Suitable for height restricted areas
  • Durable coating on all components
  • Joint misalignment compensation features


  • Standard (M24 to M64 held in stock)
  • Specials are as common as standards
  • Predominantly Wind Turbine application (extensive data base held)
  • Other typical applications: Crane slew rings, Tunnel boring machines, Gas turbine casings
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Boltight Typhoon+ tensioners have been developed to meet the technical and environmental demands of the wind energy market where high bolt load and restricted access applications are common challenges.

The robust design ensures reliability during the frequent and repeated use necessary on wind turbine projects on and offshore. For low radial clearance applications.

  • EASE OF USE - Improves the ease of use and removes the need for any manual input. Fast automatic spring return design using a single reaction allowing a full return to zero stroke piston retraction. 
  • IMPROVED SEAL TECHNOLOGY - The latest design eases seal changeouts and enhances general performance throughout high cycle usage.
  • SAFETY - Internal fail-safe technology to keep the tensioner on the bolt in the event of puller bar failure. Over-stroke prevention removes the possibility of over-stroking the pistons. Supplied with an over-stroke indicator.
  • HIGH LIFE CYCLE - High-grade material puller bar to maximize cycle life and allow long service intervals, not restricted by a fixed number of cycles.
  • LOW MAINTENANCE - Improved spring-loaded auto engagement gear-driven nut rotating socket with a geared drive needs low maintenance making the Typhoon+ tensioner user-friendly. 
  • DURABILITY - Typhoon+ has Boltight’s unique surface finish as standard which provides long-lasting protection in harsh and hard working environments.
  • OPTIONS: Port guard handle, Nipple Coupling configurations, Cycle Counter
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Foundation Tensioners

Boltight’s range of foundation bolt tensioners have been specifically designed for wind turbine base and foundation bolts.

They meet the exacting requirements of the wind industry, while remaining reliable and easy to use.

Boltight tensioners are kept in stock for the most common wind turbine applications.


  • 1500 bar
  • Common to many bolt sizes
  • Economy (customer nut) and split nut types also available
  • Spring return, gearbox, positive stop etc available as options
  • Optional single or twin connectors
  • Optional cycle counter
  • Long life composite seals
  • Comprehensive operating manual
  • Over-stroke prevention device
  • Maximum stroke indicator


  • Easy to use
  • Durable and reliable design
  • Gear driven nut run-down
  • Extra durable gearbox
  • Optimised size and weight
  • Easy maintenance

Technical Guide

Suitable for the most common threadforms:

  • Williams
  • Standard metric
  • Standard imperial
  • Macalloy
  • Dyson

Suitable for the most common OEM wind turbines:

  • Clipper
  • Vestas
  • Gamesa
  • GE
  • Nordex
  • Siemens
  • RE Power
  • Sulzon
  • MHI
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