What are they in contact with? I hope it's not aluminum. You know about galvanic corrosion, right? Stainless and aluminum is just about the worst combination possible.
Stainless to stainless will gall. Stainless to many other materials is a very good battery. As favorable a material as it might seem, it's often a poor compromise.
This is often why products use plated steel when stainless fasteners seem like such an obvious choice. In something that is high load (suspension parts), high grade steel is probably the better choice.