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Tensioner Nut & Bolt

About

Normally, in industries, different bolted joints / connections are to be used. These can be easily tightened and untightened as and when required. In medium& heavy industries /plants, different bolted joints / connections are used which require high clamp force. So bolts /studs with bigger diameter are to be used. These bolts / studs require more efforts in tightening & untightening.

Standard hex nuts used in such connections are tightened by the known tightening systems, such as : Ordinary hand or Torque wrench / Hydraulic or Pneumatic impact wrench or Thermal tightening or Sledge hammering methods. These systems do not allow easily to tightening bolts of large diameter, to the stress level required for maintaining safe operations. The force exerted by such method, is insufficient to tighten bolts or studs above M24 effectively, to the required force -tension to maintain continue operational condition. However, when such connections, comes to untightening, such as in maintenance, often creates problems and they can not be dismantled by the way they have been tightened with, and, the only solution is to torch cut, when corrosion distorted threads makes it impossible to unload the bolts.

Working Principle

In Tensioner Nut & Bolt, total clamping force is divided into no. of clamping screw. By tightening the clamping screws, a strong clamp force is generated. This clamping force is directed against a thrust washer and bolt having small friction diameter so it will help to create high clamping force with relatively little torque input.

The clamp forces are transferred through the nut body which is positioned on the main threaded bolt or stud.

A thrust washer is hardened so it is able to transfer the force while protecting the flange face.

The clamp force of many clamping screws and the opposite reaction force of the main bolt head create a strong clamping force on the flange.

The clamp force from the clamping screws creates an equally strong reaction force in the main bolt.

Benefits Of Tensioner Nut & Bolt

  • Fast & easy mounting (only with hand tool / torque wrench),
  • Main bolt/stud is pre tightened 100 % (torsion-free):-
    • Tightening in pure tension allows higher preloads on the same size bolt versus other tightening methods,
    • Generating preload high enough above the separating forces means your bolting will not vibrate loose on properly designed joints.
  • No torsion under load (no thread wear):-
    • Tightening in pure tension eliminates thread wear that commonly occurs with direct torqueing methods.
  • Uniform load distribution, easy to dismantle,
  • More effective than any other existing tightening system,
  • Much less time & manpower for mounting,
  • Requiring less space than any conventional system and are reusable,
  • Offering higher reliability and ensuring better availability,
  • Properly designed and tightened joints will not come loose in operating time. This reduces downtime of any equipment,
  • More effective than any other existing tightening system,
  • Much less time & manpower for mounting,
  • Requiring less space than any conventional system and are reusable,
  • Offering higher reliability and ensuring better availability,
  • Properly designed and tightened joints will not come loose in operating time. This reduces downtime of any equipment,
  • Uniform distribution of clamp load lead to accurate and even tension across bolted joints reduces possibility for leakages or uneven loading of adjacent fasteners,
  • For same size of main thread of bolt or stud, if go with simple hex nut ( torsion will reduce clamping capacity) if go with Tensioner nut assembly ( torsion free will enhance clamping capacity ) so ultimately It can be possible to make compact design , reduction in tooling size, machinery size, material and even machining also.