Ask the Expert – Smalley Load Specifications

Welcome to another edition of Ask the Expert, a series in which expert Smalley Engineers answer difficult questions about retaining rings and wave springs.

What is the minimum work height of part CM20-L1 if made with carbon steel SAE 1070-1090? What is the load at that height?

This specific part was designed to be compressed to a work height of 2.72 mm to achieve a load of 35 ± 3.5 N. 

We typically do not recommend compressing the spring below this designated height, but it is generally better to speak with Smalley engineer about this. Depending on how the wave spring is being used in your application, they would be able to determine whether it would be appropriate to use this spring or find you a new wave spring solution. 

Will stacking two linear springs on top of each other double the load at work height?

Stacking two linear springs on top of each other would essentially double the load, but the work height would have to be adjusted for the thickness of the extra wire. There are other possible issues that could arise when stacking two or more linear springs. An alternative to stacking would be a linear spring that is custom-designed to fit within the required work height while still meeting the load requirements. A Smalley engineer would be happy to discuss that design with you.

Would a spring manufactured in carbon steel have the same spring rate as a spring manufactured in stainless steel?

Not necessarily. We can design a stainless steel spring to carry the same load at work height as a carbon steel spring, however, the spring rate will be slightly different because you’re using a different material. Our standards are designed to carry a load at a work height and our customs are also designed to be able to meet that load and work height requirement. 

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