Springs can’t be made from just any metal. They need to be made from a steel that has a high yield strength, helping it retain it’s original shape after significant pressure is applied.
Surprise, surprise: a spring’s steel needs to be able to bounce back.
So what type of steel would be perfect for building springs?
SAE 5160 High Alloy Spring Steel, of course!
SAE 5160 is fatigue resistant, giving it the perfect qualities needed to support your vehicle without snapping or sagging way too early.
For the curious-minded, you’ll be interested to know spring steel isn’t just for springs. SAE 5160 and it’s fatigue-resistant qualities are used for a wide variety of applications, such as piano wire, lock picks, and metal swords for stage-use.