Constant Force Spring

The design of a constant force spring is for the thrust and tension required in various narrow spaces.
The constant force spring can provide high force and constant force output, with a stable and longer life cycle advantage.
We can assist our customers in design and development.

  • Material : Type 301 stainless steel is typically used for most applications. High-carbon steel and other materials may be required.
  • A wide variety of materials are available for use depending on your application.
  • Thickness : 0.04 - 1.0mm
  • Width : 2.5 - 90mm


[Constant Force Spring] / [Customized Constant Force Spring]

Constant force springs are a special variety of extension spring.  They consist of a spiral of strip material with built-incurvature.  When the strip is extended the inherent stress resists the loading force, just as in a common extension spring, but at a nearly constant rate.

In use, the constant force spring is usually mounted with a drum and the free end attached to the loading force.  This relationship can be reversed, however, with the free end mounted stationary and the constant force spring itself providing the working force, as with carbon brushes in electrical apparatus.

Constant force spring application