A Step-by-Step Guide on How to Use a Torque Wrench 

 April 15, 2023

By  Mia H.

A torque wrench is a tool or equipment used to tighten bolts and nuts with precision and accuracy. It measures the force applied to the bolt and ensures that it is tightened to a specific level, known as the torque spec. Using a torque wrench ensures that bolts are tightened correctly and prevents over-tightening, which can lead to damage or failure. It also helps to maintain the integrity of the bolted joint and prevent leaks or other problems. 

How to Use a Torque Wrench 

  1. Select the Correct Torque Wrench  

Choose a torque wrench that is suitable for the application and the torque spec required. Check the manufacturer's instructions for the correct wrench size and type. 

  1. Prepare the Bolts and Nuts  

Ensure that the bolts and nuts are clean and free from debris or rust. Lubricate the threads if necessary, and check for any damage or wear. 

  1. Set the Torque Wrench to the Desired Level  

Check the torque spec for the bolt or nut and set the torque wrench to the correct level. Use the adjustment mechanism on the wrench to set the desired torque. 

  1. Tighten the Bolt or Nut  

Place the torque wrench over the bolt or nut and apply force until the wrench clicks or signals that the desired torque has been reached. Use a smooth, even motion to apply the force. 

  1. Verify the Torque Setting  

After tightening the bolt or nut, double-check the torque setting by reapplying the wrench and checking the reading. This helps to ensure that the bolt is tightened correctly and prevents any potential issues. 

Calibrating a Torque Wrench 

Why Calibrate a Torque Wrench?  

Calibrating a torque wrench ensures that it is accurate and provides consistent readings. Over time, a torque wrench may lose its calibration, which can result in incorrect torque settings and potential issues. 

How Often Should You Calibrate Your Torque Wrench?  

The frequency of calibration depends on the usage and the manufacturer's instructions. Some torque wrenches require calibration every 5,000 cycles, while others may need calibration after 10,000 cycles. 

How to Calibrate a Torque Wrench?  

To calibrate a torque wrench, use a torque tester or a calibration device to check the readings. If the readings are off, adjust the wrench to the correct level and retest until the readings are accurate. 

Understanding Torque Specs 

What are Torque Specs?  

Torque specs are the recommended torque levels for specific bolts or nuts. They must ensure that the bolts are tightened to the perfect level and prevent damage or failure. 

How to Read Torque Specs?  

Torque specs are typically provided in a table or chart format and list the torque level for each bolt or nut. The specs may be listed in foot-pounds (ft-lbs) or Newton-meters (Nm). 

Why are Torque Specs Important?  

Using the correct torque spec helps to ensure that bolts are tightened correctly and prevent issues such as leaks or failures. It also helps to maintain the integrity of the bolted joint and prevent damage. 


To use a torque wrench, select the correct wrench, prepare the bolts and nuts, set the torque wrench to the desired level, tighten the bolt or nut, and verify the torque setting. Calibrating the torque wrench and understanding torque specs are also important for accuracy and precision. Using a torque wrench is essential for accurate and precise tightening of bolts and nuts. It helps to prevent damage or failure and maintain the integrity of the bolted joint. 


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