Dec. 16, 2024
[Editor's Note: This article originally appeared in the December issue of Grassroots Motorsports; for a torque wrench comparison from a later issue, click here.]
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If you work on cars, you&#;re probably familiar with gutendtheit&#;we&#;ve all twisted wrenches until the bolt or nut felt &#;good and tight.&#; But is the bolt that&#;s keeping your engine together, suspension attached or wheel secured to your car really tightened to the proper torque?
If it&#;s too low, the bolt or nut may work itself loose. If it&#;s too tight, you risk stripped threads or broken fasteners. If you&#;re like most of us, you probably use your trusty torque wrench when tightening an important fastener. After all, how well calibrated is your mind&#;s perception of gutendtheit, anyway?
Well, that raises another good question: How well-calibrated is your torque wrench?
While we know that a new, high-end torque wrench from Snap-On or Precision Instruments will be calibrated perfectly through its range of adjustment, once it lives in the trunk of your car or the bottom of your toolbox, all bets are off. We decided to do a simple calibration test on a trio of half-inch drive torque wrenches that lived in our workshop.
Our test was simple: Using a torque wrench calibration unit, we set each wrench to a specific torque value on its adjustor. Then we took readings of the value to which it actually tightened.. We took multiple readings on each wrench in 10 lb.-ft. increments, then averaged the result for a final value. Like most torque wrenches in use by GRM readers, none of our test wrenches had ever been serviced or calibrated since they were purchased.
Despite its wallet-friendly price, the brand-new Harbor Freight click wrench proved to be surprisingly accurate fresh out of the box. At $16, this unit becomes a disposable item should it fail or lose accuracy. It&#;s simply cheaper to buy a new one than to recalibrate it.
The accuracy of our $75 Craftsman store click wrench was a pleasant surprise after its many years of service. Its owner consistently set the wrench to the lowest torque setting when it wasn&#;t in use, which takes tension off the internal spring and helps prevent permanent damage that can affect accuracy.
Surprisingly, the expensive split-beam wrench from the tool company consistently over-torqued by almost 20 lb.-ft. from 80 lb.-ft. and above. This meant that every wheel lug nut we tightened was being over-torqued&#;and overstressed&#;by as much as 20 percent. On the upside, split-beam torque wrenches adjust very easily and don&#;t need to be placed at their lowest setting between uses. A few dollars spent to recalibrate this unit will bring it back to its original accuracy.
Spending more doesn&#;t always guarantee better results. In the case of torque wrenches, however, we have a recommendation: Buy a long-lasting tool that can be recalibrated for a modest price if it drifts out of spec.
Another tip: Treat your torque wrench like the precision instrument it is. Don&#;t toss it in the bottom of your toolbox when you&#;re done using it.
A calibration check and adjustment will cost $30 to $40 from online providers. You can also ask your local tool truck man to check it, too. Click-type torque wrenches like the ones we tested will usually last for to cycles, or clicks. That&#;s more than tire changes, or about a penny a click for our mid-priced department store torque wrench. Recalibration means peace of mind&#;you&#;ll know it&#;s more than just gutendtheit.
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MegaDork
Years ago, a Snap-On guy stopped at my neighbor's house to deliver a toolchest or something. I took the opportunity to have him test my Snap-On torque wrench (which at the time was a year old and only used for doing head bolts and other "precision" stuff), as well as a 6-7 year old Craftsman one that I kept in my track kit and had done thousands of lug nuts and always stayed at 90 lbft.
Been a while, but my recollection was that the Snap-On tested out about 4% off.
The Craftsman tested out at 3%, even though I never reset it, generally treated it pretty roughly, and it had a broken plastic locking collar. Sears replaced it a couple years later after I sheared off the nub while using it as an emergency breaker bar with a cheater pipe on the end of it, lol.
RedT2MegaDork
High-end manufacturers would love for us to believe that their expensive products are superior to their lower-priced competitors. And their marketing efforts do a good job of grooming us to think like suckers and willingly part with our hard-earned money. The truth is, there is almost always a sweet spot where good value can be obtained for a reasonable price.
Caveat emptor.
Curtis73 (Forum Supporter) GRM+ Member and MegaDorkI have a Craftsman that I never had re-calibrated and it has torqued thousands of bolts. When I started building the LS for the LeMans I figured I would have it tuned-up. Turns out it was dead on with about 1% error at the top and bottom of the range. I also have a really good one I picked up at an auction sale. I forget the brand name, but the guy was a pro machinist and it was a name I recognized, like SK or CDI or Williams. It looked unused and (although nearly dead-on at about 2%), it was not as accurate as the Craftsman.
Curtis73 (Forum Supporter) GRM+ Member and MegaDorkRedT2 said:High-end manufacturers would love for us to believe that their expensive products are superior to their lower-priced competitors. And their marketing efforts do a good job of grooming us to think like suckers and willingly part with our hard-earned money. The truth is, there is almost always a sweet spot where good value can be obtained for a reasonable price.
Caveat emptor.
When I was a grease monkey everyone laughed at my Craftsman tools while they had Snap On or MAC. Mine broke the same as theirs, but the difference was that I simply had to swing by Sears on my lunch break to get a new one. They either had to wait a week for the driver to stop by or drive to whatever town they were in that day and hope he had one on the truck.
I learned quickly that they weren't paying a premium price for a better tool, they were paying for MLM.
mdshawReader
I know size matters for torque wrenches. I have this Armstrong 100-600 1" drive 41" long. Got it from a renter that was short 1 month. Finally got to use it on some 250 lb/sqft torsion axle nuts.
GPz11 (Forum Supporter)Reader
Try swinging by a Sears now, they are all gone by me.
RossDMegaDork
In reply to GPz11 (Forum Supporter) :
Lowes carries craftmans now. Do they still take broken tools?
The0retical (Forum Supporter)UberDork
In reply to Curtis73 (Forum Supporter) :
Related links:Are you interested in learning more about wrench manufacturer? Contact us today to secure an expert consultation!
I caught the same E36 M3 in A&P school. Right up until one of my classmates broke his square and it took 2 weeks to replace it.
That said I do own a few tools that are just better from Snap-on. The stubby ratcheting screwdriver and four-way angle head wrenches being chief among them.
For torque wrenches mid-grade or better. I've had a couple really bad experiences with the cheap Harbor Freight ones.
The best torque wrench, IMO, is one that is checked for calibration on a schedule and holds the calibration well.
Ben JollyNew Reader
RossD said:In reply to GPz11 (Forum Supporter) :
Lowes carries craftmans now. Do they still take broken tools?
[Tongue click. Scoffs]
Yes. They do. Sadly my 'new' Craftsman ratchet is made in China and not as nice as the USA made one it replaced. But Lowes and Ace both honor the warranty to my knowledge. I need to get a screwdrive replaced so I'll go "audit" it once it get over being sick...
Ben JollyNew Reader
The0retical (Forum Supporter) said:In reply to Curtis73 (Forum Supporter) :
I caught the same E36 M3 in A&P school. Right up until one of my classmates broke his square and it took 2 weeks to replace it.
That said I do own a few tools that are just better from Snap-on. The stubby ratcheting screwdriver and four-way angle head wrenches being chief among them.
For torque wrenches mid-grade or better. I've had a couple really bad experiences with the cheap Harbor Freight ones.
The best torque wrench, IMO, is one that is checked for calibration on a schedule and holds the calibration well.
The story so far: In the beginning the Universe was created. This has made a lot of people very angry and been widely regarded as a bad move. -Douglas Adams
Another (formerly active) A&P here. That calibration and testing thing is pretty important. I used Craftsman torque wrenches exclusively and they were checked every year, had no problems using them during my professional career. Nowadays I use my own electric strain gauge to check all my torque wrenches every few months. The Craftsman torque wrenches still live in my box in the garage, and I carry one of the HF el cheapos in each of my cars. The HF wrenches are always in in spec, one of them I have had for over a decade, it has torqued God only knows how many lugs and it is still always in spec when I test it. I got it second hand from a pawnshop for like $5 too, no idea how old it actually is.
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