Originally Posted by
BCRider
A small point to add.....
On the better torque tables supplied by fastener compaines you'll find two torque values. One for dry threads and another for lubricated threads. Lube including oil, grease or anti sieze compounds.
If you lube a thread and then torque it to the dry spec the bolt will actually have somewhere around 20% more tension in it than it's supposed to have.
Thanks for this, BCRider. I knew it to be true, but never knew the exact amount of difference between tightening dry or lubricated. All I know is that if you tighten with oil, you tend to overtighten. I have not found this to be the same with grease. Maybe it is because the grease remains when you go to loosen, but oil dissipates after tightening and with time, leaving the fastener super-tight.