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How To Cut a Bolt Or Threaded Rod And Save the Threads

One of those simple ones that is always good to think about ahead of time.

Step 1: Put a nut or two onto the bolt/rod and tighten down past the point that will be cut off

Step 2: Cut bolt/rod with hacksaw, grinder, or bolt cutters

Step 3: File lightly to remove any flanging caused by cutting the metal

Step 4: Apply a few drops of oil (3-in-1, etc) and then slowly remove each nut, using a wrench if necessary.
Rock the nut back and forth if binding is encountered to allow the threads on the nut to re-cut the threads on the bolt.

Quick, simple and cheap.