What Does the Term “Heavy Duty Spring” Mean?

A term that is used often in the spring manufacturing business is “heavy duty spring.”  What does it mean? Whether it’s a heavy duty torsion spring, a heavy duty extension springs, a heavy duty compression spring or and heavy duty spring, it implies that a spring is capable of handling severe service in terms of load and cycle requirements.  Frequently “heavy duty” is used in die spring descriptions and are even color coded in die spring catalogs showing light, medium and heavy duty springs.

The fact is there is no quantitative measurement to determine if a spring is considered “heavy duty except with die springs.”  In die spring catalogs, the rate determines the difference between light medium and heavy duty service, but with custom springs it’s all relative.  Spring designs for custom springs determine what type of service a spring can handle at certain deflections, but the terms used to describe custom springs are light, medium and severe service springs.

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