Lug Nuts Too Tight

[jajiu]

Lots of good help here, thanks for all the suggestions. Got it all done this afternoon. Here are a few shots of the job.

 

[John T]

Looks good.

Are your rear tars filled?

When I installed my spacers I was surprised how damn heavy they were...

I also put anti-seize on the studs/bolts....

 

[pauly]

I find that Kroil is better than PB Blaster.

 

[John T]

I find that Kroil is better than PB Blaster.

ABSOLUTELY!

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[torch]

I put fluid film on the threads and surface when I put things back together and torqued the bolts to 100 ft. lbs. as stated in the manual.

Unless the manual says otherwise, torque values are understood to be for clean and DRY fasteners. As a rule of thumb, if you are going to apply anti-seize or other lubricant, reduce the specified torque by 5% to avoid over-stressing the threads.

 

[John T]

Unless the manual says otherwise, torque values are understood to be for clean and DRY fasteners. As a rule of thumb, if you are going to apply anti-seize or other lubricant, reduce the specified torque by 5% to avoid over-stressing the threads.

Not true.


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[torch]

Not true.

I have been known to be wrong before. And when I am, I appreciate learning where and how I went wrong.

So, please elucidate. Exactly what part of my statement do you consider to be in error? That the torque value refers to clean and dry threads unless otherwise specified? That lubrication increases the load on fasteners at a given torque? That the torque applied should be reduced 5% when threads are lubricated?

Because doing a little internet research suggests that only the last part of my statement is incorrect. It seems that reducing torque 5% may still be significantly overloading the fastener. The correct reduction is apparently 25 to 50%. I refer you to the following:

https://www.antiseize.com/PDFs/torque_specifications.pdf

https://www.engineeringtoolbox.com/torque-lubrication-effects-d_1693.html

https://www.fastenal.com/en/83/torque-calculator

The last one is particularly interesting. My Kubota WSM does not specify if the given table of torque values are for lubricated or dry fasteners. However, comparing the values given to the calculator it becomes clear that the values in the manual must be for clean, dry threads.

 

[GreensvilleJay]

Nice... looks like you need to order a set of fender extensions !