Bought these to fix the rotating jets in my hot tub. I think the manufacturer of my spa jets didn't put in enough bearings (I collected all the ones that fell out and there weren't enough to put the correct amount back into the jets). So I bought them and they were great and obviously 316 stainless steel, they don't rust. We use 316 at work for things that go in some nasty acid and salt baths, so a hot bath shouldn't be a problem as long as it's actually 316 π