We are talking about bolts, right? Not nuts on studs?
Either one, get as much soak time as possible with your favorite penetrating oil (not WD40). Always use a good 6 point socket. You can grind the end of the socket to get a sharp edge for maximum engagement. Sometimes a 14mm socket will hammer on to a 9/16" bolt head for a better fit, same with a 12mm on a 1/2".
If it is a nut on a stud, and it's not moving, try heating it. Concentrate the heat on the nut, not the stud. The nut will expand and loosen while it's hot. If it will move at all, start working it back and forth. The more it moves, the more rust will grind away.
If it is a bolt, use the same tricks as for the nut. If you have to heat it, while it's red hot, if you can get a straight shot at it with a flat drift, hit the head straight on. This will expand the head so the socket will fit tighter. But don't try to turn it while it's still red, it will be too weak to turn and will twist the head off. Let it cool some, then try rocking it back and forth. You can feel when it turns, verses twisting. Turning is good, twisting is bad!
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