http://www.webbikeworld.com/motorcycle-tools/thread-file/
I have a metric and SAE thread file in addition to tap and die sets and have used them both many times.
Rear axles, foot peg studs, swing arm bolts, engine mount bolts, steering stems. It's a long list. Hammer marks, oops i dropped it. road rash, cross threads, and of course the dreaded PO, there are many reasons to grab one.