Well everyone is free to do what they wish, I choose to use new u-bolts for my own peace of mind and will advise others the same. The reasons previously given are all possible and logical, not always applicable given the varying conditions but possible.
Here's another slightly different good reason, the source, and unfortunately yes it's quoted form the net..
http://www.truckcomponentsonline.com/U-Bolt-Technical-Information_df_53.html"Removed U-Bolts should NEVER be placed back onto the vehicle, they should be thrown away.
Suspension U-Bolts are manufactured with a smooth rolled thread, while the mating Hi-Nuts are manufactured with sharp cut threads. When a U-Bolt is tightened to it's recommended torque level, the U-Bolt threads stretch as they mate with the Hi-Nuts. Although, not always visible to the naked eye, this damages the threads. Removing the Hi-Nuts from the U-Bolt will cause a cross-threading that will not allow the U-Bolt to be adequately re-torqued. "
Just because you could reuse them doesn't make it a good idea or as safe as using new ones, there will be some risk. I suppose some risk too that the new ones are junk.. take your pick.
If new u-bolts aren't required then what sources promote reuse of used ones and for what reasons?
And without go and no go thread gauges how will anyone know without a doubt if the threads are damaged, pulled or still in fine shape as they may appear?
All I can find are reasons to be cautious and use new U-bolts.
Again, they're not expensive so this shouldn't be a tough decision or even the debate it's turning into.
Grigg
