Just wondering if there's a Company in the US that makes basically the same line of axles, cones and whatnot as Wheel Master does, but in some grade of stainless.......

It's not superior strength I need, it's extreme corrosion resistance.

I use my ancient RockHopper for something a bit arcane: weather spotting for the National Weather Service. In Spring and Summer, that bike is constantly soaked- along with it's rider

I've already replaced every single nut and bolt with "hardware-store-grade" (18-8) stainless, but there are a few areas I haven't done- like axle components.

The hub ball bearings are no worry- they're greased - but the axles, cones and axle nuts are exposed.....

Probably Much Ado About Nothing, really. Maybe I'm just morphing into a Techno-Elf in my advancing years, eh?