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Old 10-21-2014, 08:06 AM
Bosch Bosch is offline
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Default Lug nut torque values

I know many here don't have hubs, but for those of you who mount back wheels onto 4-stud wheel hubs with 1/2" nuts, is there a recommended torque value?

I've seen the number 35 ft-lbs online, just curious if this sounds way off to anyone?

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Old 10-21-2014, 08:23 AM
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I don't think it matters that much as long as they are on there tight. I have never used a torque wrench on them, just a socket wrench. Its not like a head gasket where you will screw it up if its under or over torqued. (That's my ignorant answer)
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Old 10-21-2014, 08:42 AM
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......35lbs. sounds reasonable if....as I think.....you are saying you use 1/2" socket to tighten them....if they were 1/2" bolts then it would be more.....
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Old 10-21-2014, 09:35 AM
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If you are using a 1/2" socket you probably have 5/16" hardware... I would think that should be more on the order of 10 ft-lbs.

35 ft-lbs seems more in line with a 1/2" bolt.
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Old 10-21-2014, 10:07 AM
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The threaded studs on the hub are 1/2".

The socket to run it on is a 13/16".

The reason I'm being anal about it is because the previous assembly had a bad habit of loosening up over time.
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Old 10-21-2014, 01:41 PM
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When I was a kid my dad taught me how to change a tire. Using the criss cross pattern of course he explained to me about torque and ft/in lbs..

He said for lug nuts he uses the "Star torque method"

He explained that you turn the wrench hard as you can.. until you see stars

not suggesting this method just a funny story this question made me think of..
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Old 10-21-2014, 02:14 PM
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I like that.
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Old 10-21-2014, 06:04 PM
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Here is a printable chart showing recommended torque settings for various sizes & grades of bolts...

FWIW, the recommended torque setting for a grade 2 course thread 1/2" bolt is 37lb-ft.
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Old 10-21-2014, 11:34 PM
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Ha really

I guess theyre soft bolts

Cat spec

3/8 bolt =40ftlb
1/2 bolt =60ftlb

Like the star method I like to run nfs on wheel nuts

Nearly f@k** stripped
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Old 10-22-2014, 07:28 PM
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The problem with over tightening is that you're imposing a constant internal high load on the connection. Then, while in use, that connector is being subjected to additional live impact loads, which means you're closer to the threshold of failure.

Now granted, we're just talking go karts, so maybe my comments are mainly acedemic.
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Old 10-22-2014, 07:29 PM
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Thanks for the replies to all.

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Old 10-22-2014, 08:25 PM
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Quote:
Originally Posted by Bosch View Post
The problem with over tightening is that you're imposing a constant internal high load on the connection. Then, while in use, that connector is being subjected to additional live impact loads, which means you're closer to the threshold of failure.
Ehhh, not exactly. Torquing a nut or bolt is akin to preloading a shock, the clamping force has to be exceeded by the load before any additional force is seen by the fastener.

The real problem with over tightening is that even if the fastener doesn't immediately fail, the excessive force from tightening tends to work harden and embrittle it.
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Old 10-22-2014, 10:36 PM
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Quote:
Originally Posted by Bosch View Post
The threaded studs on the hub are 1/2".

The socket to run it on is a 13/16".

The reason I'm being anal about it is because the previous assembly had a bad habit of loosening up over time.
I would just use Loc-tite and call it a day. My lug nuts are also the knurled kind so that helps also. It is the nut with the washer attached with the cross thread lines behind them to lock them on better instead of using lock washers.
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Old 10-22-2014, 11:28 PM
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Dont lock tite wheel nuts
Thats just stupid

U have to have a bit of reason

Just do them up tight
Wheel studs are usually a high grade so they can be done up
Past what u guys mostly see as far as bolts
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Old 10-23-2014, 06:56 PM
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Quote:
Originally Posted by Badot View Post
Ehhh, not exactly. Torquing a nut or bolt is akin to preloading a shock, the clamping force has to be exceeded by the load before any additional force is seen by the fastener.
t.
After reading this... http://en.m.wikipedia.org/wiki/Bolted_joint

I think you're right.

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