A nut and bolt so rusted that it cannot be undone, can easily be freed by cutting with a hacksaw and hammering with a cold chisel. Make as deep a cut as possible through the centre of the bolt head. Hold a cold chisel over the cut and hammer the chisel down to split the head open. If it is still not possible to split the head completely. Hammer the cold chisel from each side of the head. Once the head is severed, the core of the bolt will fall from the hole.
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