I am trying to install a trailer hitch on my 2011 Toyota Camry. I have to lower the exhaust. All bolts (14mm or 9/16") are removed except the one with a special hex nut (not sure is a hex or not but looks like).
I call it a special hex nut because all tool heads I have cannot fit that nut. And from the picture you can see it is not a regular hex nut because it seems it doesn't have equal sides.
My question is where I can find a proper tool to hold that nut and then I can screw it out?
The nut you are referring to is meant to be welded in place. The bolt then threads into and out of this nut without it moving. What you have run in to is that the bolt is so rusted in the nut, that it broke the welds and now the nut is spinning.
The bad news is that they don't make special tools for welded nuts.
A set of locking pliers sometimes called vice grips should hold the nut in place while you unscrew the bolt. If the bolt is that rusted it may require some heat (blow torch) to get it loose. Worst case scenario is to cut or drill the head of the bolt off to release the bracket and then replace it with just a regular bolt and nut.
