Using a torque wrench as a breaker bar is a common mistake that can lead to inaccurate torque readings, damage to the wrench, and improperly tightened fasteners. A torque wrench is designed for precise measurement, not for breaking loose stubborn bolts.

Why You Shouldn’t Use a Torque Wrench as a Breaker Bar

It might seem like a good idea to use your torque wrench to loosen a tight bolt. After all, it’s a sturdy tool, right? However, this is a critical error that can have significant consequences. Understanding the fundamental differences between a torque wrench and a breaker bar is key to avoiding these issues.

The Design and Purpose of a Torque Wrench

A torque wrench is a precision instrument. Its primary function is to apply a specific amount of rotational force (torque) to a fastener. This ensures bolts and nuts are tightened to the manufacturer’s exact specifications. Over-tightening can strip threads or break bolts, while under-tightening can lead to parts coming loose.

• Precision Measurement: Torque wrenches have internal mechanisms that indicate when the desired torque is reached. This is usually through an audible click, a visual indicator, or a digital readout.
• Controlled Force: They are engineered for controlled application of force, not for sudden, high-impact movements.
• Delicate Components: The internal calibration and measuring systems are sensitive.

What is a Breaker Bar and Why It’s Different

A breaker bar, on the other hand, is built for brute force. It’s essentially a long, non-ratcheting handle designed to provide maximum leverage for breaking loose stubborn or seized fasteners.

• Robust Construction: Breaker bars are made from strong materials and have a simple, durable design. They lack the intricate measuring components of a torque wrench.
• Leverage is Key: Their length allows you to apply significant force with less physical effort.
• No Measurement: They do not measure torque. Their sole purpose is to provide the mechanical advantage needed to overcome resistance.

The Negative Impacts of Misusing a Torque Wrench

When you use a torque wrench to break a bolt loose, you are subjecting its delicate internal mechanisms to forces far beyond their intended operating range. This misuse can lead to several problems.

Damage to the Torque Wrench’s Calibration

The most significant impact is the damage to the wrench’s calibration. When you apply excessive force, especially a sudden jolt, you can bend or break internal springs, gears, or other components responsible for measuring torque.

This means that even when you later use the wrench for its intended purpose, it will no longer provide accurate readings. You might be over-tightening or under-tightening fasteners without realizing it.

Compromised Accuracy and Reliability

A compromised torque wrench is worse than no torque wrench at all. If its calibration is off, you lose the confidence that your fasteners are secured correctly. This can lead to dangerous situations, especially in critical applications like automotive repair or aerospace.

For example, if a wheel lug nut is under-tightened due to an inaccurate torque wrench, the wheel could eventually loosen, leading to a serious accident.

Potential for Wrench Failure

While designed to be robust for their intended use, torque wrenches are not indestructible. Applying the extreme forces required to break loose a seized bolt can cause the wrench itself to fail. This could result in a snapped handle or other damage, potentially causing injury to the user.

Inaccurate Fastener Tightening

After using a torque wrench as a breaker bar, its accuracy is suspect. If you then use it to tighten a fastener, you might believe you are achieving the correct torque, but in reality, you are not. This leads to improperly secured components, which can cause malfunctions or safety hazards.

When to Use a Breaker Bar Instead

The rule of thumb is simple: if a fastener is difficult to loosen, reach for a breaker bar. It’s the right tool for the job and will prevent damage to your more sensitive equipment.

Identifying Stubborn Fasteners

You’ll know a fastener is stubborn if it doesn’t loosen with moderate pressure from a standard ratchet. If you find yourself applying significant body weight or needing to "shock" the fastener loose, a breaker bar is your best bet.

The Correct Tool for the Job

Using the correct tool not only ensures the job is done properly but also protects your investment in specialized tools like torque wrenches. A good breaker bar is a relatively inexpensive addition to any toolkit.

People Also Ask

### Can I use a breaker bar to tighten bolts?

No, you should never use a breaker bar to tighten bolts. Breaker bars are designed solely for loosening stubborn fasteners. They do not measure torque, and using one to tighten can easily lead to over-tightening, stripping threads, or breaking bolts. Always use a torque wrench for final tightening.

### How do I reset a click-type torque wrench after use?

After using a click-type torque wrench, it’s recommended to set it to its lowest torque setting before storing it. This reduces stress on the internal spring mechanism, helping to maintain its accuracy over time. Do not store it at the torque value you last used.

### What happens if I over-tighten a bolt with a torque wrench?

If you over-tighten a bolt with a torque wrench, you risk stripping the threads of either the bolt or the mating part. You could also stretch or break the bolt, or damage the component being fastened. Always ensure you are using the correct torque specification for the fastener.

Conclusion: Protect Your Tools and Your Work

In summary, while it might be tempting to use your torque wrench for breaking loose stubborn bolts, it’s a practice that should be avoided at all costs. The potential for damaging the wrench’s calibration, leading to inaccurate readings and compromised safety, is simply too high. Always use a breaker bar for loosening tight fasteners and reserve your torque wrench for its intended purpose of precise tightening. This ensures the longevity of your tools and the integrity of your work.

Consider adding a high-quality breaker bar to your toolbox to handle those tough loosening jobs.