If you can get to the end of them i.e they are not on a pipe, use the nearest but slightly smaller sized imperial spanner/socket and hammer it on, providing the thread has not rusted solid that will undo it. For pipes where you obviously cant fit anything over the nut, a small pair of stillsons or similar should work. Failing that, weld a larger nut over the top of the existing one, on a pipe cut a slot in the side so you can slip it over.
On reassembly give the threads a coat of waxoil, they will then come undone next time.
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