You choose hydraulic nut splitters according to the availability and need. For the pneumatic model makes too much noise and may not be preferred in all cases.
The best way to get rid of such bad nuts without affecting the threading is to use a nut splitter. Adjust this tool over the nut and turn the handle until the nut cracks.
In the field of production where thousands of machines are used, there are also some small devices and tools which perform in a manner that one have to notice.