I expected some answers like these, but I still have my doubts. I don't know, I mean, you may be right when you say that hardwood dowels can be pretty strong, but I imagine the threaded rod with also some benefits, like the compact factor (less wood removed), and because of the threads, we have an interesting surface area where glue can seat and hold, specially if you clean it with a metal brush before applying the glue, glue that can be titebond 3, not epoxy or any other expensive one. I have used titebond 3 more than bonding woods, I also tried to glue PVC to PVC using it, the bond was incredible strong, i simply could not take it apart, now imagine the glue seated in the threaded rod.
I was planning doing two things with the rods, first one was using it as dowels, and second as, i don't exactly know how to call this, but I also need to insert a 4" threaded rod, 2" deep in the wood, that way half of the rod remain external, I need this point to then insert a board with a hole, and then I add a washer and a nut, I found this method great for some book shelfs that I am doing, because because of the inserted threaded rod, they can be used as a guide while placing the shelf level into the main columns. I mean, the column has 2 holes, that receives the threaded rods that are inserted into the shelves, that permits you to arrange and place everything and then add and tight the nuts. So here glue is important so the threaded rod is perfectly holded by the wood, so it won't rotate when tightening the nuts. I think that titebond 3 is just as amazing as epoxys are, the only bad thing is the set time, we need one day in order to get the maximum strength.
Last edited by Johanx3; 02-20-2016 at 04:25 PM.