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Torque Graph

Torque/torque-angle tightening

Torque-controlled tightening

  • In the majority of cases where bolts are used, torque-controlled tightening is the method used to tighten.
  • With this method the friction on the thread and head of the bolt act as a precise pre-tensioning force, therefore the use of accurate tools is imperative.
  • Effectively the bolt can be tightened quicker.
  • This method is more practical and easy.
  • Light, compact tools can be used where space is limited.

Hydraulic Tensioning

  • As the nut is not rotated under load, there is no torsional load on the bolt.
  • After achieving the desired applied load, the nut can be tightened without causing stresses on it. The correct applied bolt load is therefore achieved.
  • Even different co-efficients (levels) of friction have no effect on the tensioning process.

Torque/torque-angle-controlled tightening

  • Torque/torque-angle-controlled tightening is more precise than purely torque-controlled tightening.
  • The defined amount of rotation of the bolt (torque angle) provides automatically and accurately the required pretension.
  • Control is achieved directly from the power pack, by means of microprocessor technology within the pump.
  • Higher quality bolting joints are achieved.
  • Results can be stored and used at a later date for documentation required in quality assurance processes.
  • The whole control process is achieved without the need of external sensors, hence no need for extra cables from the tool.
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