Quote:
Originally Posted by Freestyler
That prediction that made you do that edit, is spot on. 
It is only the bolts that are supposed to strech when tightened to torque spec. not the nuts. So i would assume that you could re-use the nuts.
That been said, if i were convinced that i needed to replace the bolts, i would go all the way and replace the nuts too. |
I thought it might be interesting to go back to the first posts of this thread, and found this query. I found a specific directive from BMW during my search that mentions the NUTS are also SINGLE USE.
paraphrasing: "since the nuts are self-locking type, they can't be trusted to engage and lock on reuse"
however, there is a more important reason, covered by
this document from Fastenal, that describes how the NUT stretches during installation and the threads engage differently the second time. (this greatly throws off the torque to tension numbers).
So IMHO, it's actually more important to replace the nut than the bolt (at least for the first five uses; I would not use the bolt more than 5 times, and I will be actually using 12.9 bolts that don't need to be stretched to yield to get the same force).