Torque Vs Tension

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Torque vs Tension. Which is right for you?

Before comparing Torque and Tension, we need to first understand what they are, and how do they work. “Torque” is a measure of how much force is required to spin the nut up along the threads of a bolt.  “Tension” is the stretch of a bolt that provides the clamping force of a joint. Both methods are suitable ways to seal joints, and they both have their pros and cons.

Pros and Cons of using Torque

  • More cost-effective than tensioning
  • Longer Threads are not required
  • Simple to use
  • Less accurate than tensioning
  • It is slower as you have to tighten each bolt individually
  • Various factors create friction and impact on the torque needed

Pros and Cons of using Tension.

  • More accurate than torquing
  • Easy to control
  • On large bolt diameters you will save time compared to using torque wrenches
  • More expensive than torquing
  • More complicated
  • Extra measurements and considerations needed

How do Hand Torque Wrenches Work?

Torque is the measurement of distance times force. One foot away from the fastener and one pound of force applied, is one foot pound of torque. A torque wrench allows fasteners to be tightened to the proper tension. The handle contains an internal indicator which connects to a calibrated scale. Once you have reached the desired torque, you can stop twisting the bolt. Most torque wrenches come with an easy-to-read screen.

How do Hydraulic Torque Wrenches Work?

There are 2 different types of hydraulic torque wrenches. Hydraulic square drive (TWHC) and a hydraulic low profile (TWLC). The Wrenches are placed over the nut or fastener then verifying that the reaction arm or pad firmly and squarely connects to the selected reaction point or area. Start the hydraulic pump and advance the hydraulic torque wrench. As the wrench strokes forward the reaction pad will react against the reaction point and the socket or hex will rotate. When the hydraulic torque wrench reaches the end of its stroke, the pump pressure will build rapidly.

To reattract the torque wrench simply release your finger from the advance button on the hand pendant control. The wrench ratchet mechanism will be heard clicking as it retracts, apply another forward stroke. Repeat this process until the desired input pressure has been achieved.

A hydraulic torque pump unit powered either through air (PA554, RWP554, RWP554-BS, PA60A) or electric (PE554, PE554TWP, PE39, PE45)  then connected to a torque wrench through twin line hoses (TWH15-BS) these system are capable of operating at 10,000psi.

Hydraulic Torque Wrench Hire

Hydraulic Torque Wrench Hire

TJI Solutions hire stock offers a wide range of hydraulic torque wrenches, such as, hydraulic square drives, low clearance torque wrenches, high cycle torque wrenches, slimline torque wrenches, for both hire and sale, each hydraulic torque wrench arrives fully certified and complete with all certification. If your requirement is tightening or breaking out, we can supply the bolt torque equipment and accessories to suit.

TJI Solutions are able to supply the best equipment available on the market such as SPX Bolting, SPX Powerteam, Enerpac, Rapid Torc, Atlas Copco, Norbar, Ingersoll Rand, Torque Safe and many more, making TJI Solutions your one stop shop for all your requirements covering all industries and applications.

We are offering 10% off a new hydraulic torque wrench when you trade in your old one. Our torque wrench pumps come with free twin line hoses, and a free calibration when it’s next due.

How do hydraulic tensioners work?

First, the nut is hand tightened on the stud. You then mount the tensioner on the stud-nut assembly. Hydraulic pressure is applied which then stretches the stud, the stud’s nut is wound down against the joint face, then pressure is released and the tool is removed.

Tensioners can be a lot faster than torque wrenches, as you can tighten all tensioner cells at the same time.  This does come at a larger cost than if you were to buy torque wrenches and there is a lot to consider and take into account to make sure the tensioning cells fit correctly.

The SPX SRT Spring Return Tensioner features unique automatic quick release bridge adaptation, piston stroke indication and piston over stroke prevention.

Spring Return Bolt Tensioner

The SRT is the most popular Spring Return Bolt Tensioner in the industry due to it’s ability to improve productivity whilst Increasing safety to the operator. The Spring Return Bolt Tensioner design dramatically increases productivity and safety on the job site when compared to older technology manual return tensioners. Furthermore you will find a fully enclosed load cell design which eliminates entry of debris into piston retraction mechanism.

Hydraulic Tensioner Hire

If you are looking for controlled bolting, TJI offer a complete range of topside tensioners for hire. We also offer wind tensioners and subsea tensioners for purchase. We can offer a lifetime warranty on all SPX Bolting products.

Contact us today if you have any question the team at TJI Solutions will be happy to help.

So, in conclusion – which is best? Torque or Tension?

If you base your decision on budget alone, this may cause more costs further down the line with trying to repair any issues.

Both options have their advantages and disadvantages as mentioned above, and it is important to use the method recommended by the manufacturer.

TJI Solutions is your one stop shop for all your requirements covering all industries and applications. Please get in touch today and we will be happy to answer any of your questions.


TJI Solutions – Torquing your language!!

Scotland: 01224 063 680

England & Wales: 0191 917 0576


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