What Is a Torque Wrench?
A torque wrench is a precision tool used to apply a specific amount of torque (tightening force) to a fastener like a bolt or nut.
Torque is typically measured in Nm (Newton meters) or ft-lb (foot-pounds). Depending on your region and your engineering requirements, you need to pick the right tool for your application.
Why are Torque Wrenches Important?
Why is this important? Because overtightening can damage threads, deform parts, or cause premature failure, while under-tightening can result in loose components and safety risks.
🆚 Torque Wrench vs. Ratchet: What’s the Difference?
Torque Wrenches are often mistaken for similar looking tools such as ratchets. However, they should not be used the same way. A torque wrench is a precision product!
Unlike Ratchets, Torque Wrenches are designed to apply specific torque values and will have a click mechanism to indicate specific torques are reached. Like vernier calipers and other measuring tools, they can be calibrated to a high accuracy setting.
Do not use a torque wrench to loosen nuts! It will spoil the torque wrench.
✅ How to Use a Torque Wrench (Step-by-Step)
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Set the Desired Torque
Adjust the handle or dial to your required torque setting. Lock it in if your wrench has a lock feature. Most wrenches have this. -
Attach the Socket
Choose the correct size and ensure it’s seated properly. The socket must match the drive size of your wrench. -
Apply Slow, Even Pressure
Grip the handle firmly and pull steadily. Do not jerk or rush. -
Stop When You Hear/Feel the Click
For click-type wrenches, once it clicks—you’re done. Do not overtighten. -
Release Torque Setting After Use
Always reset the wrench to its lowest setting before storing to preserve calibration.
Common Mistakes to Avoid (and could damage your torque wrench)
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Using a torque wrench to loosen bolts — this can damage the internal mechanism.
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Continuing to pull after the click — you'll risk overtightening.
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Not calibrating the wrench regularly — especially in professional use, calibration is key.
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Dropping the wrench — even once can knock it out of spec.
Stay tuned to learn more about choosing the right torque wrench - as well as some reviews to understand how to pick out the right torque wrench for your application.
