How to use a torque wrench?

A torque wrench is an essential tool for achieving accurate and consistent torque settings when tightening nuts, bolts and fasteners. Whether you are a seasoned mechanic, a DIY enthusiast or a student of science, understanding how to use different types of torque wrenches properly is crucial for ensuring the integrity of your projects. In this article, we will delve into the world of torque wrenches, exploring their various types and torque wrench use step-by-step instructions on their proper usage. Additionally, we will touch upon maintenance tips to prolong the lifespan and accuracy of these valuable tools.

 

What is a torque wrench?

A torque wrench is a precision tool designed to apply a specific amount of torque to a fastener, ensuring that it is tightened to the manufacturer’s specifications. This prevents over-tightening, which can lead to damage, as well as under-tightening, which may result in inadequate fastening. Torque wrenches are commonly used in automotive, industrial, and construction applications, as well as in various scientific fields where precise torque settings are crucial.

 

How to use a torque wrench?

Using a torque wrench correctly involves a few simple yet vital steps. Here’s a general guideline:

Select the correct torque wrench: Different torque wrenches are designed for various torque ranges. Ensure you choose the appropriate type based on the torque requirements of your project.

Prepare the fastener: Insert the appropriate socket onto the torque wrench. Place the socket onto the fastener you intend to tighten.

Set the desired torque value: Most torque wrenches allow you to set the desired torque value using a built-in scale, knob, or digital display. Consult the manufacturer’s specifications for the correct torque setting.

Tighten gradually and steadily: Apply force to the torque wrench in a smooth, controlled manner. As you tighten, the wrench will emit a distinct signal once the preset torque level is reached.

Stop at the click or signal: When using a click-type torque wrench, you will feel a noticeable click or hear an audible sound once the target torque is achieved. At this point, stop applying force.

Release pressure: After reaching the desired torque, release pressure on the torque wrench. Remove the tool from the fastener.

 

How to use a digital torque wrench?

Digital torque wrenches offer precise torque measurement with the added benefit of a digital display. Follow these steps to effectively use a digital torque wrench:

Power on: Turn on the digital torque wrench using the power button or switch.

Select units: Choose the appropriate torque units (Nm, lb-ft, etc.) using the unit selector button.

Set target torque: Input the desired torque value using the digital interface or keypad. Ensure you set the correct units as well.

Attach socket and fastener: Attach the socket to the wrench and place it on the fastener to be tightened.

Apply torque: Gradually apply force to the wrench until the digital display indicates that the preset torque value has been reached.

Stop and release: Cease applying force as soon as the wrench signals that the target torque has been achieved. Release pressure and remove the tool from the fastener.

 

How to use a dial torque wrench?

Dial torque wrenches are known for their simplicity and reliability. Here’s how to use one effectively:

Set the scale: Rotate the dial on the torque wrench’s handle to align the desired torque value with the reference line or indicator.

Attach socket: Attach the appropriate socket to the wrench and place it on the fastener.

Apply torque: Apply gradual force to the wrench until the dial’s indicator aligns with the reference line. This indicates that the preset torque has been reached.

Release pressure: As the indicator lines up with the reference line, release pressure on the wrench and remove it from the fastener.

 

How to use an adjustable or click torque wrench?

Adjustable or click torque wrenches are widely used due to their reliability and ease of use. Follow these steps to utilise them effectively:

Adjust the setting: Rotate the torque adjustment collar to set the desired torque level. Some wrenches have a lock to secure the setting.

Attach socket and fastener: Attach the socket and place the wrench on the fastener.

Apply torque: Begin applying force to the wrench in a controlled manner. The wrench will emit a click sound once the preset torque is reached.

Stop and release: As soon as the click is heard, stop applying force and release pressure on the wrench. Remove it from the fastener.

 

Maintenance of torque wrench

Regular calibration: Periodically calibrate your torque wrench as per the manufacturer’s recommendations to maintain accuracy.

Storage: Store the torque wrench in a protective case or pouch to prevent dust, moisture, and damage.

Avoid over-tightening: Refrain from using your torque wrench as a breaker bar to prevent strain on its internal components.

Cleaning: Wipe the torque wrench after use to remove debris and dirt. Lubricate moving parts as suggested by the manufacturer.

Professional servicing: If you notice irregularities or loss of accuracy, seek professional servicing.

 

FAQs

What is a torque wrench used for?

A torque wrench is used to apply a specific amount of force to fasteners, ensuring precise tightening.

How do I set the desired torque value?

Most torque wrenches have a scale or digital display where you can set the desired torque value.

What should I do after reaching the target torque?

Once the wrench signals or clicks, stop applying force and release pressure on the wrench.

Can I use a torque wrench for different torque ranges?

Yes, there are various types of torque wrenches designed for different torque ranges.

What are the benefits of using a digital torque wrench?

Digital torque wrenches provide accurate readings with a digital display for easy reading.

How does a dial torque wrench work?

Dial torque wrenches have a dial indicator that aligns with a reference line when the preset torque is achieved.

Why is maintenance important for torque wrenches?

Maintenance ensures accuracy and extends the lifespan of the torque wrench.

 

Got any questions or point of view on our article? We would love to hear from you. Write to our Editor-in-Chief Jhumur Ghosh at jhumur.ghosh1@housing.com