Here’s how to shorten a machine bolt, threaded rod or carriage bolt, without messing up the threads. First, thread two hex nuts onto the bolt, then make the cut using a hacksaw or jigsaw with a metal-cutting blade. Spin off the nuts, one at a time, using a wrench if necessary. When the nuts come off the end of the bolt, they’ll re-cut and straighten out any threads that were damaged by the saw, making it easy to thread the nut back on.
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