When the spec says a plasma cutter can cut 3/8", does that mean it can cut 3/8"
in any conductive material? Aluminum? Stainless? Or does the rated thickness
vary with material the way it does for a punch or shear?

I have a 25A plasma cutter with which I cut 1/4" steel all the time, and I want
to try it on 1/4" aluminum ..

GWE