Preset 40 n/m Harbor Freight torque wrench failed me
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Preset 40 n/m Harbor Freight torque wrench failed me
I keep a Harbor Freight 1/2 drive torque wrench preset with a 19mm socket to take a Shimano lockring tool. The units are in foot pounds so I looked up the conversion to newton meters on a chart. I want to say 40 n/m is about 19 ft/pounds. I like to pop my cassette in an ultrasonic cleaner and re-install it fairly quickly while I’m doing my chain waxing.
I have it set & have left the dial on the same setting. Previously it clicked reliably when the HG lockring was at the specified torque.
It worked fine last week on my 9 speed Dura Ace 7700 wheel. Today I was working on a 10 speed SRAM cassette on another Dura Ace 7700 hub.
Well I cleaned the SRAM cassette & reinstalled it. I proceeded to tighten down the lock ring, waiting for a click. Well it didn’t click so I kept going - then something snapped!
Bummer! The snap I felt was not the torque wrench clicking, it was something now broken. I know this because the cassette was now loose.
So I removed the lock ring & inspected for damage. Strange thing is, I couldn’t find any.
Just for the hell of it, I tightened it again - by feel only and everything tightened up OK or so it seems.
could anyone speculate if I broke something? I will do a test ride around the neighborhood before embarking on a more serious ride.
I have it set & have left the dial on the same setting. Previously it clicked reliably when the HG lockring was at the specified torque.
It worked fine last week on my 9 speed Dura Ace 7700 wheel. Today I was working on a 10 speed SRAM cassette on another Dura Ace 7700 hub.
Well I cleaned the SRAM cassette & reinstalled it. I proceeded to tighten down the lock ring, waiting for a click. Well it didn’t click so I kept going - then something snapped!
Bummer! The snap I felt was not the torque wrench clicking, it was something now broken. I know this because the cassette was now loose.
So I removed the lock ring & inspected for damage. Strange thing is, I couldn’t find any.
Just for the hell of it, I tightened it again - by feel only and everything tightened up OK or so it seems.
could anyone speculate if I broke something? I will do a test ride around the neighborhood before embarking on a more serious ride.
Last edited by masi61; 06-10-19 at 09:23 AM.
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40 N-m is around 29.5 ft-lbs.
You should not keep a torque wrench permanently set at torque. After use you need to release it and leave it loose.
If you heard a snap, and the cassette became loose (define how it became loose), you almost certainly broke something. Did the ring come off the hub body? Are you sure it isn't cracked? Threads deformed? Is the freehub body damaged - thread deformed or body cracked?
You should not keep a torque wrench permanently set at torque. After use you need to release it and leave it loose.
If you heard a snap, and the cassette became loose (define how it became loose), you almost certainly broke something. Did the ring come off the hub body? Are you sure it isn't cracked? Threads deformed? Is the freehub body damaged - thread deformed or body cracked?
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Harbor Freight is to tools what Walmart is to bicycles.
Also, 40 Newton X meter = 29.5 pound X foot
In my experience lock rings kind of go on less than smoothly, so maybe that is all that happened. If you didn't damage the thread, and the cassette behaves normally, it is probably ok.
Also, 40 Newton X meter = 29.5 pound X foot
In my experience lock rings kind of go on less than smoothly, so maybe that is all that happened. If you didn't damage the thread, and the cassette behaves normally, it is probably ok.
Last edited by Cyclist0108; 06-09-19 at 09:22 PM.
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In my experience many Harbor Freight tools are better suited to their purposes than Wal-Mart bicycles. They are also nice to modify if I need to, for example, grind down a wrench for a special job, and would rather not do that to my Craftsman or Snap-On tools.
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Harbor Freight is all about getting you cheap stuff, spend more money for better tools and be less disappointed..
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I should copy this as I post it every few months. Neighbor brought his HF torque wrench over as he was suspicious it was an issue. Calibration showed it was dropping every thing but the lowest levels. Took it back with him to the store and the manager said "...we will change it out but wait for after next weekend parking lot sale to clear current inventory, after that we will have a new batch in and they should be OK, you do not want one off our shelf just now."
Return to "0" and periodically calibrate, lots of you tube videos on how to do calibration.
Return to "0" and periodically calibrate, lots of you tube videos on how to do calibration.
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I’ve bought a fair number of automotive and power tools from HF, and they’ve been pretty good. The thing to watch out for is the somewhat spotty QC, resulting in the occasional “dud”, but their return policy is good, so just return it until you get a good one. I will say that the large torque wrench (50-150 ft.lb) I got there was nowhere near the quality of a larger (50-250 ft.lb) Kobalt wrench that I got from Lowes. HF aren’t pro-level, but if you don’t abuse them, they’re adequate for home mechanic use
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40 N-m is around 29.5 ft-lbs.
You should not keep a torque wrench permanently set at torque. After use you need to release it and leave it loose.
If you heard a snap, and the cassette became loose (define how it became loose), you almost certainly broke something. Did the ring come off the hub body? Are you sure it isn't cracked? Threads deformed? Is the freehub body damaged - thread deformed or body cracked?
You should not keep a torque wrench permanently set at torque. After use you need to release it and leave it loose.
If you heard a snap, and the cassette became loose (define how it became loose), you almost certainly broke something. Did the ring come off the hub body? Are you sure it isn't cracked? Threads deformed? Is the freehub body damaged - thread deformed or body cracked?
I had wondered if I should have reset the torque wrench to zero then reset to the specified torque each use. Dang it!
This bike is supposed to be ridden 50+ miles for the Tuesday club ride.
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I’m thinking that the soft aluminum threads of the SRAM HG lockring slipped out of the titanium internal threads of the Dura Ace 7700 freehub body. Replacing the lock ring is obviously going to be much less speedy than if I just somehow ruined the freehub body.
I had wondered if I should have reset the torque wrench to zero then reset to the specified torque each use. Dang it!
I had wondered if I should have reset the torque wrench to zero then reset to the specified torque each use. Dang it!
"Failure" mechanism for a torque wrench kept loaded is that the spring may weaken, so, if anything, it's not delivering the torque you think it is.
As an aside, I test my HF 3/8" wrench on the tester in the metrology lab at work. It's still reasonably accurate (within 15%), and this allows me to compensate when setting it:
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A beam type torque wrench is both cheap and reliable. Never goes out of calibration. Much preferable to a cheap click type torque wrench.
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Have you taken the cassette off and really closely looked at everything?
It sounds like a spacer at the cassette body deformed. Or you thrashed the thread on the lockring. I guess it’s possible that some grit was in there and you smashed it, that is the best case scenario.
I own two torque wrenches. I see value in having them. I think you also need to get comfortable with doing things by feel. If for no other reason than to set off the inner alarm that something isn’t right.
It sounds like a spacer at the cassette body deformed. Or you thrashed the thread on the lockring. I guess it’s possible that some grit was in there and you smashed it, that is the best case scenario.
I own two torque wrenches. I see value in having them. I think you also need to get comfortable with doing things by feel. If for no other reason than to set off the inner alarm that something isn’t right.
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This is the kind that is always used with ultra-centrifuge caps. I think they are considered the most user-proof, and cracking an ultra-centrifuge tube can result in a major disaster, so it has to be right. Also, they are usually bi-directional. I don't know why they are scoffed at.
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Beam torque wrenches are great but can't always be used at an angle which makes reading the scale convenient.
Sometimes the bolt is just at an awkward angle and reading the scale is not even possible. This is when a click wrench makes more sense.
-Tim-
Sometimes the bolt is just at an awkward angle and reading the scale is not even possible. This is when a click wrench makes more sense.
-Tim-
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#15
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The instructions for the torque wrenches I have (HF and Husky) indicate that the wrench should be turned back to zero after each use and 'exercised' by periodically turning them up towards the max. value and returned to zero.
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Have you taken the cassette off and really closely looked at everything?
It sounds like a spacer at the cassette body deformed. Or you thrashed the thread on the lockring. I guess it’s possible that some grit was in there and you smashed it, that is the best case scenario.
I own two torque wrenches. I see value in having them. I think you also need to get comfortable with doing things by feel. If for no other reason than to set off the inner alarm that something isn’t right.
It sounds like a spacer at the cassette body deformed. Or you thrashed the thread on the lockring. I guess it’s possible that some grit was in there and you smashed it, that is the best case scenario.
I own two torque wrenches. I see value in having them. I think you also need to get comfortable with doing things by feel. If for no other reason than to set off the inner alarm that something isn’t right.
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This sounds reasonable. I plan on dialing mine back to zero when I'm done using it.
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HF isn't the tool you want if you use that tool often. However for occassional use, they are great because they are cheap. The only big and immediate difference between the HF torque wrench and the better ones I've used is that the HF doesn't have as perceptible a break as the others and it can easily be missed sometimes while tightening things. Over the long haul, I expect the HF will wear out sooner. But for the few times I use it, that might be after I'm gone.
P.S. Walmart bikes aren't bad bikes. They just aren't the bike for those that want to ride 100 plus miles a week. Just like HF isn't the tool for the person that needs to torque 100 nuts and bolts a week.
P.S. Walmart bikes aren't bad bikes. They just aren't the bike for those that want to ride 100 plus miles a week. Just like HF isn't the tool for the person that needs to torque 100 nuts and bolts a week.
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HF isn't the tool you want if you use that tool often. However for occassional use, they are great because they are cheap. The only big and immediate difference between the HF torque wrench and the better ones I've used is that the HF doesn't have as perceptible a break as the others and it can easily be missed sometimes while tightening things.
Agree fully about HF tools for light use. They're rust prone, and not the most durable, but I'm only an occasional mechanic. I do tend to stay away from their power tools though.
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Thanks for making that point about the subtle break in HF wrenches. I meant to mention that to the OP that he might have missed the click. I was having that problem last night with my 1/4" wrench and stem bolts. You need to get close, and then just take it really slow.
Agree fully about HF tools for light use. They're rust prone, and not the most durable, but I'm only an occasional mechanic. I do tend to stay away from their power tools though.
Agree fully about HF tools for light use. They're rust prone, and not the most durable, but I'm only an occasional mechanic. I do tend to stay away from their power tools though.
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I have a 6' bar in my garage with S hooks at each end and a 1/2" socket welded in the center. I set it up to calibrate torque wrenches. A gallon jug of water comes out right about 8.33 pounds. At 3' out from the center that gives me 25 foot pounds of torque. The Harbor Freight torque wrenches are horribly calibrated but luckily they are easy to calibrate.
I recently calibrated mine to 50 foot pounds for some engine work that I was performing. My only question is how the linear it is.
I recently calibrated mine to 50 foot pounds for some engine work that I was performing. My only question is how the linear it is.
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The directions on my SK torque wrench say to set back to zero, after each use. Probably the same for the HF one, whoever made it. Just get another. HF tools are expected to be cheap and disposable.
Tim
Tim
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Another trick (assuming the calibration is accurate): Set the wrench to 35Nxm first, get the click, and then set it to 40. It should only require a little bit more actual movement. Also, when setting it, overshoot the desired setting slightly and come back down to the correct value.