US    UK    mexico    IT    IN    China

Lee Spring
 Lee Spring
Lee Spring
Lee Springs Specialty Springs: Learn About Constant Force Springs
 Lee Spring
Lee Spring

Lee offers Constant Force Springs in four Life Cycle ranges. Each spring is a roll of high yield Type 301 Stainless Steel strip exerting a nearly constant restraining force to resist uncoiling. When the strip is extended, the inherent stress resists the loading force at a nearly constant rate.

Guide to Mounting Constant Force Springs
A Contant Force Spring is usually mounted by first tightly wrapping it on a drum, then attaching the free end to the loading force such as in a counterbalance application. This relationship can also be reversed.

  • The drum diameter should be 10 to 20% larger than its natural diameter.
  • One and one-half wraps should remain on the drum at maximum extension.
  • The strip becomes unstable at long extensions and should be guided to
    prevent twisting or kinking on recoil.
  • Idler pulleys must be larger in diameter than the natural diameter and should never be used to cause back-bending against the natural radius of curvature.



2500 Life Cycle

4000 Life Cycle

13000 Life Cycle

25000 Life Cycle


Return to home page

Lee Spring
corner bottom left  corner bottom right
Lee Spring
Lee Spring
corner bottom left  corner bottom right
Lee Spring

  ISO 9001 Registered Company      
  Phone: 888-SPRINGS (888-777-4647) • Fax: 888.426.6655 • Email: sales@leespring.com            © Copyright 2014 Lee Spring Company

Compression Coil Springs | Plastic Springs | Wave Springs | Die Springs | Extension Springs | Torsion Springs | Belleville Washers | Custom Springs