[Ultramaroon]

Originally Posted by Spuds

Well, as long as the stress on the spring doesn't exceed the fatigue limit of the material, it should last damn near forever right? I think that's where a brand name spring's metallurgy and higher detail of engineering come in. My guess is that they also probably have a lower factor of safety because there is more control over the manufacturing process.

I went to school for aero, so my materials science education is a bit basic, so I may be missing something.

Also, I'm very proud of myself for engaging in technical discussion without using acronyms.

Nope. I don't think you're missing anything. If the assumptions about control of manufacturing process hold true, it all makes sense.