Hydraulic Tensioners

Hydraulic Tensioners

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.

Standard Hydraulic Tensioners

Boltight’s standard range of hydraulic bolt tensioners are designed for general use on top side applications. Each tool comprises of a hydraulic cylinder, bridge, puller and socket.

Interchangeable adaptor kits fit common hydraulic cylinders to enable the tightening of multiple bolt sizes.


Designed to fit most ANSI B16.5, MSS SP44 and API17D flanges. Compatible with metric and imperial bolts from ¾” (M20) – 4” (M100).


Indicator ring
Seal kit
Blanking plug
Bonded washer seal (where applicable)
Male quick connector
Male - Male adaptor
Snap ring
Grub screw


  • 1500 bar MWP​
  • 15mm stroke​
  • Profiling for weight saving​
  • Quick release bridge​
  • Single or twin port options​
  • Long life composite seals​


  • Easy to install and remove
  • High wear and corrosion resistant surface treatment
  • Extremely durable due to surface coating of components (Nitride)
  • Internal features to compensate for joint misalignment
  • Tools can be connected in sequence improving operation speed and ensuring even joint compression
  • Available from stock

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.

Hydraulic Bolt Tensioning

Boltight solutions make it possible to tighten and loosen multiple bolts simultaneously using high-pressure hydraulics.

Bolt tensioners stretch the bolt before the nut is wound down under zero friction, ensuring extreme accuracy, speed and uniformity.


  1. A tensioner is attached to the bolt or stud
  2. High-pressure hydraulics are used to axially stretch the bolt
  3. Bolt stretch/elongation creates the clamping force, as the bolt is stretched, the nut lifts clear of the flange
  4. An access window in the tensioner allows the nut to be turned down with very little friction
  5. When the hydraulic pressure is released, the nut traps the stretch in the bolt retaining the ‘load’


  • Tension is applied directly to stretch the bolt, meaning that no friction needs to be overcome
  • Applied load is very accurately controlled, as it is directly proportional to the pressure applied to the hydraulic bolt tensioner
  • Loss of load between applied and retained load after tensioning is 20% less than frictional loss associated with torque
  • Accurate residual load outcomes due to calculable load loss
  • Tensioning can be repeated

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