How to Use a Torque Multiplier

By Richard S. Clark | Last Updated: September 9, 2022

There are three types of torque multipliers, and the procedure of using each one of them differs slightly from the other. Tightening or even loosening the heavy-duty bolts can be a daunting task, requiring one to be creative when working on the same. These various types of torque multipliers are there to assist you to do your work easily. In the automobile industry, for example, you have to tighten the bolts securely to prevent parts from moving! That can be possible with the use of a torque multiplier. Read through this article to find out how to use it when working with bolts and nuts.

Also ready how does multiplier work?

What are the different types of torque multipliers?

They are:

  1. Manual multipliers
  2. Electrical
  3. The pneumatic

We are going to look at each one of them individually.

The manual torque multiplier

It works best for heavy-duty nuts and bolts. With this, you can tighten or loosen these parts with a lot of precision. The manual one is best for use when dealing with advanced duties such as the gearbox assembly. When in use, you can get to know when to end the task. That is because when you reach the desired levels, it will stop delivering torque. Generally, manual multipliers are portable, light, and they are suitable for job sites where there is no electric power. That means its work is not affected by a lack of electric energy!

The electric torque multiplier

You have to connect it to a power source before using it. It features a microprocessor that controls the system and its functionality. Therefore, its torque will correspond to the power that is in the controller. It works well for either continuous loosening or tightening of the heavy-duty nuts and bolts. The international standards dictate that this multiplier should be inspected regularly by a professional. The timing inspection is on the following parameters:

  • Once in a year, or
  • After one thousand hours of constant use.

You should conduct the inspection based on whichever occurs earlier between the two. If, for example, a year elapses before you achieve the thousand hours, then you should do the inspection. Consequently, if you happen to use it for two thousand hours within the year, then you have to service and inspect it twice!

The pneumatic torque multiplier

It is another version of the electric multiplier but which is more powerful. Instead of using electric currents, it uses compressed air for more power. You can use it for the extra-heavy-duty fastening and loosening of nuts and bolts. Despite the heavy work that it does, it is easy to use and works with a smooth and continuous rotation.

How to use a torque multiplier

After getting to understand the different types of torque multipliers, we are now going to look at their applications. Surprisingly, apart from the range of application and the power source, all three work similarly. The intensity of the work can be the only difference.

The manual torque multiplier

  • Check on the multiplication factor for the model that you are using. You may need to reset the wrench based on what you have reviewed.
  • Assemble the wrench, especially the socket’s “O” ring, but retain the pin.
  • Use a short socket as it works well for such types of multipliers.
  • Place it on the fastener and make sure that it rotates in the appropriate direction. The wrench should also revolve in correspondence with the system.
  • Select the best and appropriate reaction point.
  • Tighten the multiplier and be keen to hear the “click” sound. When you hear the sound, it would mean that the multiplier is now locked and that it is ready for use. However, when in use, avoid striking the anti-wind-up ratchet.

The electric torque multiplier

  • Place it on a flat surface and insert the reaction device to its spline.
  • Onto the square drive, place a standard type socket.
  • Move the rubber safety ring over the pin.
  • Connect to a power source and switch it on and off to test if it works.
  • Onto the screw or the nut, secure either a connector or the standard socket.
  • Make sure that the multiplier is in the correct position to avoid damages.
  • The motor will stop when it achieves the preset torque levels.

The pneumatic torque multiplier

  • Connect it to the air supply and check the airflow when it is running.
  • Assemble the wrench, especially the socket’s “O” ring, but retain the pin.
  • Use a short socket as it works well for such types of multipliers.
  • Refer to the user manual for specifications on the nut settings.
  • It should be running free as you put the air pressure to the correct setup.
  • Tighten the connection until it comes to a complete stop.
  • Release all the air in the system and detach the air hose.


There are three types of multipliers. They have the same functionality, only that the setting can be somewhat different. Always observe safety when using such tools.

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