Re: Bolts for trailer bunks
Here is one method I have had to use in the past. I had to install some carriage bolts that had the head counter sunk and they would just spin no matter how much you turned the nut. It sounds a little odd at first, but it worked. It requires a bolt that is a bit longer than origianl, but you can cut the excess off after you are done if you need to.
Install the carriage bolt. Start on the nut you will use to hold the bolt in place. Install two additional nuts and use them as jam nuts to each other. Once they are jammed, hold the upper nut with one wrench while tightening the very first nut. Sometimes as the bolt is tightened, it will hold itslef and you can let go of the jam nuts. If not, the very first nut is tight, you can unjam the other two nuts and remove them. The threads remain in good condition and the nut and bolt can be removed in the future if need be.
If my attempt to explain this leaves you confused, let me know and I will try to make up some pics.