In article fhipk.16$p72.9@trnddc05, "Jon" wrote:

I've heard of roll form tapping in stainless steel.

I'm scared, and I'd guess others in here are, as well.

Please share some details.

I've done it in sheet steel, used to production tap electrical boxes.
Thousands of them.

I've heard it is great in Aluminum, but I've never tried it.

One thing to watch out for with SS is work hardening. Depending on how
you drill the hole, you can end up with a nice hard surface inside, which
your tap will not appreciate.

Doug White