> The best studs I've run into were on the cat flange of an older Toyota> Previa - some sort of hardened steel. After 150K, the nuts were corroded
> to where they weren't even hex shaped (removed with a Dremel cutoff
> wheel and cold chisel), but the studs were in perfect shape, no
> corrosion at all. I'd like to know what they were made of.
My guess is A286 Stainless Steel.  Great stuff for exhaust hardware.�Happy trails,John