f you guys use copper slip when reinstating components how much do you reduce your torque figures by

 

Depends on the Coefficient of friction that the preferred lubricant has, MSDS will provide those details?

 

Not every one will understand that, its like saying its on your method statement and risk assessment.
I too would like to know how it affects torque settings and if theres a definitive guide. 👀

 

https://www.engineeringtoolbox.com/t...ts-d_1693.html

 

Don you know why im asking the question as does Wuz.
So what this guide is saying is if you use the right lube you can reduce your torque by 40,%? probably right but im just not seeing it.
Regarding wheel nuts it just doesnt feel right, it feels like just the weight of the torque would undo them.

 

Subaru recommend that you put a little oil on the threads of their bolts prior to torqueing so the recommended torque they state is not a "dry torque" (dry torque" normally involves a fully cleaned thread which is secured by a locking fluid eg, "Locktite").

general rule would be a drop of 10-15% in torque when using Copperslip instead of "light oil"

 

I've looked in to this a little deeper and found that only 10% of applied torque results in useful bolt load. This would be on a dry bolt I guess.
50% is wasted on overcoming nut face friction
40% is wasted on overcoming friction between the bolt threads and the nut threads