The bearing raceways used in the Diamond version of our footer are machined out of Silicon Carbide. That is a place where high hardness is beneficial for isolation performance.
I use a lot of carbide cutting tools in my shop. I'm not sure they use any carbide. They don't tell you much about the product but want you to just trust them that it is good.
hard carbide would be about the opposite of springs which provide isolation.
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