Originally Posted by
KerryIrons
A quality axle is made of hardened steel, so shortening it (and keeping the threads in usable shape) is not for the faint of heart.
Modern power tools. cut off wheel, grinder etc. Like cutting any threaded item thread on locknut, cone, or whatever, and run it back off after cutting and dressing the cut to chase the threads.
Honestly even a hacksaw. it's not like you're cutting through inches of material. it's a hollow axle.