John Doe wrote:

So much for my idea of upgrading my inline skating grocery
cart with a stainless steel axle.

Yeah but.

Stainless steel ain't an upgrade! LOL

Stainless steel is for -corrosion- -resistance-.
It's quick to gall and has other bad properties.
Not always but it's usually soft, like your 304.

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Picture the perfect cake recipe.

Add four times too much of one of the ingredients so the cake won't
rust. Only if you want non-rusting cake, is stainless steel a good
idea. xD

For knife blades it's crap.

Alvin in AZ