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Old 01-16-2013, 05:54 PM   #1
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100 ft/lbs lock nuts trust...

well... i just installed my new rear zinc plated brake discs in my Jeep Wrangler... but now reading some interesting threads in this forum suggesting to tight the lock nuts following the manufactured spec (100 ft/lbs)... the question is... do you trust that spec?

i mean, i know coming from the manufacture, should be fine... but before i use to tight the nuts as much as possible of course trying to not damage the rims...

the other day i got this crazy Mastercraft Torque Wrench at CanadianTire.ca for 49.99 (on sale)... and finally i got the chance to use it... but... 100 ft/lbs...?? Jesus..!!! i hope my Jeep keep the tires in place and don't lose them on the Highway..!!!!!



Mastercraft 1/2-in Drive Torque Wrench | Canadian Tire

anyway... any thoughts..??

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Old 01-16-2013, 06:09 PM   #2
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Are you talking about your lug nuts?

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Old 01-16-2013, 06:13 PM   #3
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Are you talking about your lug nuts?
yes...

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Old 01-16-2013, 06:18 PM   #4
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I've torqued about a million lug nuts to 95 ft/lb, no problems. Pretty common for 1/2"-20 studs...
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Old 01-16-2013, 06:22 PM   #5
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I prefer ~115ft/lbs, especially when dealing w/after market wheels. The safe bet is retorque them after a short drive.
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Old 01-16-2013, 06:29 PM   #6
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I go to 100ft/lbs and its been fine. That's quite the clamping force when you consider all five lug nuts.
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Old 01-16-2013, 06:34 PM   #7
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Keep in mind, I torque wrench operates most accurately in the middle of its range. So for 100 pounds, you don't want a wrench that tops out at 100ft pounds...
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Old 01-16-2013, 08:12 PM   #8
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Keep in mind, I torque wrench operates most accurately in the middle of its range. So for 100 pounds, you don't want a wrench that tops out at 100ft pounds...
Didn't know that-thanks for the tip.
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Old 01-16-2013, 08:15 PM   #9
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Quote:
Originally Posted by goodysgotacuda View Post
I've torqued about a million lug nuts to 95 ft/lb, no problems. Pretty common for 1/2"-20 studs...
^This

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Originally Posted by InvertChaos View Post
I go to 100ft/lbs and its been fine. That's quite the clamping force when you consider all five lug nuts.
This too.
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Old 01-16-2013, 08:18 PM   #10
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Thanks for all your replies guys...!!!!

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Originally Posted by Mopar2Ya View Post
The safe bet is retorque them after a short drive.
i think i will do this after i finish work tomorrow afternoon... let see if they still tight at 100 ft/lbs...
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Old 01-16-2013, 08:31 PM   #11
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You will not have a problem with your torque wrench i have been using the same model for 5 years , never failed me , seems to be accurate as well as long as u keep it cranked down to its lowest setting when not in use, i have never had a wheel come loose on my jeep at 100 ft/lbs and deff re torque after 100kms or so just to be safe.
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Old 01-16-2013, 08:37 PM   #12
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The instructions that came with my aftermarket wheels suggested 85-95 ft/lbs but I went 100 anyway. If you go too tight you can affect your brake caliper performance and you might also find it hard to get them loose on the side of the road in an emergency.
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Old 01-16-2013, 08:43 PM   #13
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I think Jeep specs 105 ft/lbs so you are with in the plus or minus error at 100 ft/lbs. I called Raceline and they recommended that their rims be torqued to 85 ft/lbs on a wrangler. I said I thought that was kind of low and the guy said "you ask what we recommend" and "we recommend 85 ft/lbs on a 1/2" stud" I told him Jeep recommended 105 ft/lbs and he said that was pretty high but probably would be ok too lol.
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Old 01-16-2013, 09:07 PM   #14
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The manual for my '12 JKU says lug torque is 95 ft lbs, so that's as high as I'll go. I'm quite sure that varies from model to model or year to year, though, so don't trust us. Read your manual.
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Old 01-16-2013, 09:13 PM   #15
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Originally Posted by geckojk1 View Post
You will not have a problem with your torque wrench i have been using the same model for 5 years , never failed me , seems to be accurate as well as long as u keep it cranked down to its lowest setting when not in use, i have never had a wheel come loose on my jeep at 100 ft/lbs and deff re torque after 100kms or so just to be safe.
Nice!

Thanks for the head up... And yes.. I read something about to keep it in the lowest setting when not in use.... Btw, at the moment to buy the torque wrench, they gave me a "life time" free calibration at any canadian tire... Which i think is kind of cool... But hell that's definitely out of context here...

Thanks again for all your replies guys....!!!
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Old 01-16-2013, 09:53 PM   #16
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Nice!

Thanks for the head up... And yes.. I read something about to keep it in the lowest setting when not in use.... Btw, at the moment to buy the torque wrench, they gave me a "life time" free calibration at any canadian tire... Which i think is kind of cool... But hell that's definitely out of context here...

Thanks again for all your replies guys....!!!
I torque my 2010 stock wheels to 95 per Teraflex.
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Old 01-16-2013, 09:55 PM   #17
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I found the secret number is 106 ft/lbs, I gained about 2-4 mpg after setting all of them to it
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Old 01-16-2013, 10:11 PM   #18
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I found the secret number is 106 ft/lbs, I gained about 2-4 mpg after setting all of them to it
And the ride is much smoother @ 106ft/lbs
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Old 01-16-2013, 10:57 PM   #19
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95 all my jeeps
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Old 01-16-2013, 11:52 PM   #20
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Old 01-17-2013, 12:15 AM   #21
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Thanks for all your replies guys...!!!!

i think i will do this after i finish work tomorrow afternoon... let see if they still tight at 100 ft/lbs...
Also the measurement is tightness. So its not 100 lbs force per lug holding the tire on, its it takes that much force to spin the lug. So the clamping force is actually much, much higher than 100 lbs force I would imagine. If you're worried about them coming loose, then you have to consider that to even get them that tight you needed a lever 2ft long and still had to apply a decent amount of force. They aren't going to come off on their own hopefully!!
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Old 01-17-2013, 11:51 AM   #22
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I'm guessing the spec also accounts for having to overcome the friction between the nut and the wheel. I think our Wrangler nuts are 60 degree cones, others can be flat or cones of different angles. Heavy trucks sometimes use flat nuts with integrated free spinning washers. I'd imagine the amount of friction is different between each type, plus the metal type and finish could effect things.

Either way, I stick to what the manual says.

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