The Big Lie: Nutbusting/breakaway torque

[KMdef9]

 

[chrisnazzy]

So the 2763 can achieve 1036 ft lbs of torque in reverse but can technically remove a bolt torqued to 1100 ft lbs as long as it's little warm......hence the claim of 1100 ft lbs of "breakaway" or "nut busting" torque.

I own this exact tool. I have on several occasions taken it to work to give it a work out on some heavy duty stuff. It has no problem removing lug nuts that are torqued at 600+ ft lbs on large bus chassis RV's and heavy trucks.

I have watched a bunch of tool review videos done by this guy. He does a really nice thorough video. His Trusty Cook videos really sealed the deal for me on that purchase. This video actually just makes me like my Milwaukee 2763 even that much more!

Chris.

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[KMdef9]

So the 2763 can achieve 1036 ft lbs of torque in reverse but can technically remove a bolt torqued to 1100 ft lbs as long as it's little warm......hence the claim of 1100 ft lbs of "breakaway" or "nut busting" torque.

A warm, well greased and not rusted bolt, yes, very slowly. Real world 1100ft lbs, no. Which is the point of the video.

I'm not knocking the Milwaukee, just agreeing with the video that nutbusting claims are BS.

 

[chrisnazzy]

A warm, well greased and not rusted bolt, yes, very slowly. Real world 1100ft lbs, no. Which is the point of the video.

I'm not knocking the Milwaukee, just agreeing with the video that nutbusting claims are BS.

Yes. Definitely not real world but a hell of a cordless impact wrench. Thank you for sharing the video. I did enjoy watching it and it has actually inspired me to go check out some more of his other videos.

Chris

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[HCNDM]

Very educational!

Note he never knocks the tool but only explains the marketing term.

Thank you for sharing!


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[pstemari]

The entire video seems a bit dubious, measuring bolt tension and using it to infer torque. That works when tightening it, since tension and friction are working together to resist the wrench, but when loosening it the direct effect of the tension is to loosen the bolt. It's only the friction of the nut on the threads and plate that the tension increases.

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[HCNDM]

The entire video seems a bit dubious, measuring bolt tension and using it to infer torque. That works when tightening it, since tension and friction are working together to resist the wrench, but when loosening it the direct effect of the tension is to loosen the bolt. It's only the friction of the nut on the threads and plate that the tension increases.

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Wasn't that kinda the point? To point out the nut busting torque is a dubious terminology that doesn't prove anything?

Mind you I am not an engineer so please don't see the above as critique but as a question to further my knowledge.

The way you describe it is kinda how I interpreted the video...


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[Robbie UK]

The entire video seems a bit dubious, measuring bolt tension and using it to infer torque. That works when tightening it, since tension and friction are working together to resist the wrench, but when loosening it the direct effect of the tension is to loosen the bolt. It's only the friction of the nut on the threads and plate that the tension increases.

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Probably better to think of the bolt tension as changing the dimensions of the thread to the point that they become an interference fit. It's not all about friction, especially when clean and lubricated.

 

[Weird Tolkienish Figure]

Isn't there sort of a uh... risque implication to "nutbusting"? Maybe that's what these companies are going for?

 

[Fedwrench]

Does anyone actually buy an impact based on its nutbusting torque rating?

Call me cynical but, I view every manufacturer's claims with a grain of salt. I think all of them manipulate data for the sake of marketing.

 

[Infinia]

most all marketing claims are always to taken with a bit of skepticism.
infact that's why they use or invent words that sound impressive but have ambiguous scientific definitions.

 

[nh_yota]

I think nut-busting torque should be measured in mother-in-laws instead of foot-pounds.

 

[Ign]

I've kinda debated this before as I've always believed (and still do) that ratings are nonsense.

But anyone who really cares should see posts #52 and #72 here where Marlin says IR's ratings are 100% legit on an 1.25" bolt, including having their own sockets custom machined to get them in 1/2" drive (which surprised me they'd go to such lengths).

http://www.garagejournal.com/forum/showthread.php?t=209377

 

[KMdef9]

Does anyone actually buy an impact based on its nutbusting torque rating?

Call me cynical but, I view every manufacturer's claims with a grain of salt. I think all of them manipulate data for the sake of marketing.

I've seen several members bring up the nutbusting number to talk up their tool, sadly.

And I agree. Everyone uses their own equipment in their own mannor. Lots of companies manipulate their "tests" to achieve or exaggerate their results.