Ask the Expert - How do I Measure the Free Height of a Wave Spring?

It’s important to know to how to properly measure a wave spring’s free height in order to verify that you are using the correct part for your application. When done correctly, it can also save valuable inspection time. 

To Measure the Free Height of a Wave Spring:

1.  Ensure the spring is sitting on a flat surface between two parallel plates
2.  Lower the top measuring surface until it touches the spring
3.  Apply a slight force to deflect the spring until the crests of all waves come in contact with the loading surfaces (top & bottom)
4.  The distance between the two parallel plates is the free height

Please watch our video for a better understanding of how to measure the free height. 

Important Definitions:

Free Height: The height at which a wave spring is measured in its free state

Work Height: The designed height at which a desired force/load is delivered

It is also important to note - the free height of a wave spring is typically a reference dimension. Wave springs are normally designed to provide a specific tolerance/load at a given work height.

Smalley engineers are readily available to assist with your technical questions, including assistance in the design of springs to meet the specs of your application. Contact us at engineering@smalley.com if you have any additional questions.