I remember the first time I really messed something up with a torque wrench. I was rebuilding the front end of my old pickup, feeling all high-tech and precise. The manual said torque these bolts to 75 ft-lbs. So, I cranked it down, heard a nice little ‘click,’ and figured I was done. Then, about a week later, I hear this awful grinding noise. Turns out, I’d slightly over-tightened one of the caliper mounting bolts, warping the rotor. Expensive lesson learned.
It brings up a question a lot of folks ask, especially after dropping some cash on one of these fancy tools: can I loosen bolts with a torque wrench? My honest answer? Yes, you can, but it’s usually not the best idea, and here’s why.
Why Your Torque Wrench Isn’t a Breaker Bar (and Never Should Be)
Look, I get it. You just spent a chunk of change on a torque wrench, probably a click-type, because you want to do things right. It feels like a precision instrument, and in a way, it is. But its job is to measure and apply a specific amount of tightening force, not to break loose stubborn fasteners. Think of it like this: you wouldn’t use your finest set of surgical scalpels to chop firewood, right? Same principle here.
The guts of a torque wrench are designed for delicate measurement. When you apply force in the opposite direction—loosening—you’re basically asking it to do something it wasn’t engineered for. Many torque wrenches, especially the cheaper ones, have internal mechanisms that can get damaged if you use them for breaking bolts free. That little spring and pawl system that gives you that satisfying ‘click’ when you reach the set torque? It’s not built for the kind of shock loading and high, sudden force that breaking a seized bolt requires. You can bend or break internal components, throwing off its accuracy entirely. And once its accuracy is shot, it’s just a glorified breaker bar, and not a very good one at that.
I’ve seen guys do it, mind you. They’ll set it to its highest setting, maybe even push past the click, and give it a heave. Sometimes it works.
More often than not, it leads to a busted tool and a bolt that’s still stuck. My personal experience? I had a fairly decent mid-range clicker that I used once to try and loosen a stubborn exhaust manifold bolt. It felt wrong from the start, like I was fighting the tool itself.
The bolt eventually came free, but the next time I went to torque something down, the wrench started clicking way too early. I ended up buying a new one. So, while technically you can loosen bolts with a torque wrench, it’s a gamble I don’t advise taking unless you’re prepared for the consequences.
Forcing a fastener loose with a tool meant for precision tightening is a recipe for disaster, both for your hardware and your wallet.
When ‘tight’ Meets ‘stuck’: The Real Deal on Breaking Bolts
So, if not the torque wrench, what’s the right way to tackle those bolts that seem welded in place? This is where the real mechanic’s arsenal comes in. Forget the delicate touch; when a bolt is seized, you need brute force, but applied intelligently. Penetrating oil is your absolute best friend here. Brands like PB Blaster or Kroil are worth their weight in gold. You spray it on, let it soak—sometimes for hours, even overnight—and then you try again. The oil seeps into the threads, working its magic to break down rust and corrosion.
After the soak, you need the right tool for the job. A good quality, solid breaker bar is what you want. These are simple, solid bars with a pivot head, designed purely for applying maximum use. They don’t have any delicate measuring mechanisms to worry about.
Get one with a long handle for extra use. Sometimes, a sharp, firm pull is all it takes after the penetrating oil has done its work.
If that doesn’t do it, you might need to introduce some impact. This is where an impact wrench comes in handy, but you have to use it carefully. (See Also: Can You Use Wd40 To Loosen Bolts )
A few short bursts, not sustained hammering, can shock the bolt loose without damaging the threads or the surrounding material. Be warned, though: cheap impact wrenches can be more frustrating than effective.
Another trick is heat. Applying heat with a propane torch or, for serious cases, an oxy-acetylene torch to the area around the bolt can cause the surrounding metal to expand, potentially breaking the bond. Be extremely careful with heat, though. You can damage paint, plastic, rubber seals, or even warp delicate components.
And never, ever use heat on or near fuel lines or anything flammable. A controlled application of heat, followed by more penetrating oil (careful, it’s flammable!) and then a breaker bar, is a tried-and-true method.
I once spent an entire Saturday wrestling with a single exhaust flange bolt on a rusty old Jeep. It involved PB Blaster, a propane torch, a lot of colorful language, and finally, a breaker bar. It was a battle, but the bolt eventually surrendered.
The key is patience and using the right tool for the task, which, nine times out of ten, means leaving the torque wrench on the shelf for loosening duties.
Torque Wrench Types and Their (limited) Loosening Capabilities
Not all torque wrenches are created equal, and understanding the different types gives you a better clue about why using them for loosening is a bad idea. The most common ones you’ll find are click-type torque wrenches. You set your desired torque value, and when you reach it during tightening, it gives you a distinct audible and tactile ‘click.’ These are great for precision tightening on things like engine components, lug nuts, or anything where the manufacturer has specified a torque value to prevent over- or under-tightening. The internal mechanism relies on a spring-loaded detent or cam system.
Then you have beam-type torque wrenches. These are simpler, with a needle that moves along a calibrated scale as you apply force. They’re generally less expensive and can be quite accurate if used carefully, but they don’t give you that satisfying click. You have to watch the needle constantly. Dial-type torque wrenches are similar to beam types, but the indicator is on a dial. Electronic torque wrenches offer digital readouts, often with audible and visual alerts, and sometimes even data logging. They’re the most sophisticated and usually the most expensive.
Now, when it comes to loosening, the design of these tools becomes a problem. For click-type wrenches, as I’ve hammered home, the internal mechanism is not meant for the shock and strain of breaking a bolt free. You risk damaging the spring or the detent, rendering it inaccurate for its intended purpose.
Beam and dial types are slightly less prone to catastrophic internal damage from loosening because they lack the complex click mechanism, but you’re still putting undue stress on the pointer and scale. Plus, they aren’t designed for the kind of sudden, high force needed to break a seized fastener. The pointer could bend, or the scale could become misaligned. Electronic wrenches can sometimes handle loosening better than click-types, but their delicate sensors and digital displays are still not ideal for the rough-and-tumble world of seized fasteners.
The bottom line is, any tool designed for precision measuring of torque is going to be compromised if used for brute-force breaking of torque. It’s like using your expensive digital kitchen scale to hammer a nail – it might work once, but it’s not what it’s for and you’ll probably break it.
Common Mistakes When Using (or Misusing) Torque Wrenches
Beyond the obvious mistake of trying to loosen bolts with a torque wrench, there are a bunch of other ways people can mess things up, either during tightening or with general care. One biggie is not storing them properly. Many click-type wrenches have a spring that can weaken over time if left compressed. The advice from most manufacturers, and it’s good advice, is to back them off to their lowest setting when not in use. Don’t store them in a damp toolbox either; rust can wreak havoc on the internals. (See Also: Does Heating Rusted Bolts Help Get Them Free )
Another common error is not calibrating them regularly. Torque wrenches, especially after a lot of use or if they’ve been dropped, can lose their accuracy. Most reputable brands recommend calibration checks every 5,000 cycles or annually. If you’re not using yours that much, it’s still a good idea to get it checked every couple of years. You might think you’re torquing to spec, but if the wrench is off, you could be way over or under. I learned this the hard way when a head gasket blew prematurely on an engine I’d rebuilt. Turns out, my trusty old torque wrench had drifted out of spec. Buying a new one and getting it calibrated was cheaper than replacing that gasket again.
People also tend to forget about the type of lubricant on the threads. Manufacturer specs are almost always based on clean, dry threads unless they explicitly state otherwise.
Applying oil or anti-seize compound when the spec is for dry threads will significantly change the clamping force you achieve at the specified torque. You’ll end up over-tightening the fastener, potentially stripping threads or deforming components.
Conversely, if the spec calls for lubricated threads and you use dry ones, you’ll under-tighten. It’s a subtle but important point that many DIYers overlook. Also, never, ever use a torque wrench as a regular wrench to snug up bolts before torquing them. That initial snugging should be done with a regular ratchet or wrench.
The torque wrench is for the final, precise application of torque.
When a Torque Wrench might Be Okay for Loosening (rare Cases)
Alright, let me be clear: this is the exception, not the rule. There are very specific, almost niche, situations where using a torque wrench for loosening might not be a disaster, but you still need to be incredibly careful. These scenarios usually involve fasteners that are designed to be tightened to a precise, low torque value and are unlikely to be seized. Think of very small, delicate fasteners on electronics, or certain plastic components where over-torquing would cause immediate damage.
For instance, some small electronic devices might specify a torque of just 1 or 2 Newton-meters (Nm) for tiny screws. If you’re using a torque wrench that can accurately measure down to that level, and you’re just gently breaking the seal on a screw that you know isn’t rusted or cross-threaded, you might get away with it. The force required is minimal, so the risk of damaging the wrench’s delicate mechanism is lower. However, even in these cases, a small, dedicated screwdriver or a micro-driver designed for electronics is a much safer bet. The risk is still there if the screw happens to be a little tighter than expected.
Another theoretical possibility is on some very high-end, specialized tools where the manufacturer explicitly states it’s acceptable. I haven’t personally encountered one, but I’ve heard whispers. They would likely be built with much more solid internals and designed with loosening in mind, or have a very specific type of mechanism that tolerates it.
For the vast majority of us, using a standard click-type or beam-type torque wrench for loosening is a gamble. It’s like asking a calculator to be a hammer. It might smash something, but it’s not what it’s built for, and you’re likely to break the calculator in the process. Always, always prioritize using the correct tool for the job.
A good set of breaker bars, impact sockets, and penetrating oil will serve you far better for loosening stubborn fasteners than your precious torque wrench.
The Big Question: Can I Loosen Bolts with a Torque Wrench? My Verdict
Let’s sum this up. Can you physically turn a bolt the other way with a torque wrench? Yes, you can apply rotational force. Will it work without damaging your torque wrench or the bolt/thread? Usually, no. The primary function of a torque wrench is to apply a specific amount of tightening force, measured precisely. It is not designed for the shock, vibration, and high, unpredictable forces involved in breaking a seized or overtightened fastener loose. Using it for loosening can compromise its calibration, damage its internal mechanisms, and render it inaccurate for its intended purpose of precise tightening. This can lead to costly mistakes down the line, like stripped threads, damaged components, or fasteners that aren’t properly secured. (See Also: Does Anti Seize Cause Bolts To Loosen )
Consider this a PSA from someone who has learned the hard way. I’ve seen too many good tools get trashed because their owners tried to make them do jobs they weren’t built for.
The temptation is there, especially if your torque wrench is the most substantial tool you have at hand. But the reality is, a dedicated breaker bar, impact wrench, or even just a good quality ratchet with the right socket is the proper way to tackle stubborn fasteners.
Investing in these basic tools is far cheaper than replacing a damaged torque wrench or repairing the damage caused by an improperly torqued (or loosened) fastener. The peace of mind knowing you’re using the right tool for the job is worth more than the few bucks you might save by risking your torque wrench.
What Is the Correct Way to Loosen a Bolt?
The correct way to loosen a bolt generally involves using a breaker bar or a ratchet with the appropriate socket. Apply steady, firm pressure. If the bolt is stubborn, use a penetrating oil like PB Blaster or Kroil, let it soak, and then try again. For really stuck bolts, controlled heat application or an impact wrench (used in short bursts) can be effective. Always make sure you are using the correct size and type of socket to avoid rounding off the bolt head.
Can a Torque Wrench Be Used for General Tightening?
While a torque wrench can be used to tighten fasteners, it’s generally not recommended for general, preliminary tightening. Its purpose is precision application of torque to a specific value, not to simply snug something up. Using it for general tightening can put unnecessary wear on its delicate internal mechanisms, potentially affecting its accuracy. A standard ratchet or wrench is better suited for the initial snugging phase before final torque application.
How Often Should a Torque Wrench Be Calibrated?
Torque wrenches should ideally be calibrated annually or every 5,000 cycles, whichever comes first. However, if a torque wrench has been dropped, subjected to excessive force, or if you suspect its accuracy has been compromised, it should be checked and calibrated immediately. Regular calibration is key to make sure the wrench is providing accurate torque readings.
What Happens If You Use a Torque Wrench as a Breaker Bar?
Using a torque wrench as a breaker bar can damage its internal calibration mechanism. The sudden, high impact force required to break a bolt free is not what the internal springs and measurement components are designed for. This can lead to inaccurate readings in the future, meaning your torque wrench will no longer be reliable for precise tightening, potentially causing issues like over-tightening or under-tightening.
A Few Practical Tips for Torque Wrench Care
Beyond the obvious—don’t use it to loosen bolts—there are a few simple things you can do to keep your torque wrench in good shape and make sure it’s accurate for years. First, as mentioned, always back off the setting to its lowest point after use. This relieves tension on the internal spring and helps maintain its calibration. Think of it as letting the tool relax after a hard day’s work.
Second, store it properly. A hard case is best. Avoid tossing it in a toolbox where it can get banged around. If it doesn’t come with a case, consider getting one. Keeping it clean and dry is also important, as rust can corrode the internal parts and affect its performance. For electronic torque wrenches, make sure you follow the manufacturer’s battery maintenance guidelines.
Third, if you’re buying one, consider the type. For most DIYers, a click-type is fine, but make sure it’s from a reputable brand. For important applications or if you’re using it very frequently, a dial or electronic torque wrench might offer better long-term reliability and easier verification of accuracy. And always, always read the manual. They usually have specific care instructions that are worth following.
Conclusion
So, to circle back to the main question: can I loosen bolts with a torque wrench? The short, blunt answer is: you shouldn’t. It’s like using a precision surgical instrument for demolition; you’ll likely break the tool and potentially cause damage. Torque wrenches are designed for applying a measured, specific tightening force, not for the brute force needed to break loose stubborn fasteners. Trust me, I’ve learned this lesson the hard way, and it’s a costly one if you damage your tool or the components you’re working on.
Stick to breaker bars, ratchets, and proper loosening techniques. Your torque wrench deserves to be treated with respect, used for what it’s designed for, and kept accurate. It’s an investment in doing things right, and that means using the right tool for every step of the job, not forcing one tool to do the work of three. Keep your torque wrench calibrated and clean, and it will serve you well for many projects to come.
