boltsstuck
The thick metal plate has a thread for two bolts. By mistake I screwed one of the bolts in all the way. Now the bolt won't come out from the metal plate – bolt spins freely both directions. I tried to apply downward force on plate while turning the bolt in hopes that it will "catch on thread", but it didn't.
Any tips on how to get the bolt out? And is the thread most likely ruined in the plate and/or bolt?
P.S. this part is from washing machine where it goes into trunnion.
Based on the clarifications, I would recommend using a reusable thread-locking liquid.
Here is a link to one I found that may work. I have not used it.
Vibra-Tite VC3 Threadmate http://www.vibra-tite.com
(I am in no way affiliated with the Vibra-Tite Company)
First. I would ensure that you are using a 4-way Tire Iron. It makes you apply equal pressure to the bolt and you will be amazed at the different. In fact, if you have not tried this. Then i would not worry about the heat source for now.
In terms of the blow torch. you need anything that can throw enough heat to make the bolt almost red hot (note I say almost)
A butane torch will be totally fine. Just watch out, the hot nut will be a little easier to snap when hot.
Best Answer
By getting the bolt positioned in the manner shows in the image, you have effectively filled a hole that is just a bit too tight for easy removal. This means that you should be able to tap with a hammer or mallet the bolt until the thread engages the bar threads. Caution should be exercised to not cause deformation of the bolt thread or bar thread as they near engagement. Consider also to rotate the bolt as you tap downward to assist with the gentle thread coupling.