Extension Spring Initial Tension

  • Extension Spring Design Resources – What Is Initial Tension?

One of the least understood elements of spring design is initial tension in extension springs. So often designers will guess at the amount of force necessary to overcome this one time load, or they will disregard it entirely. Though two springs may be identical in physical size, they can vary substantially in load at a given length depending on the amount of initial tension.

A highly technical description of initial tension is coiling the spring against the plane of its own axis. However, most spring-makers simplify the description by saying that initial tension is simply the amount of force that is required to begin deflection.

Generally, the higher the spring index (Mean Diameter/Wire Size) the lower the initial tension will be, and conversely, the lower indexes produce higher initial tension.

Please contact the Newcomb Spring facility nearest you for more information on initial tension and other considerations of spring design.

Extension Springs

Manufacturing Specifications

  • .007 to .625 Inches In Spring Wire Diameter
  • Custom Extension Spring End Options to Meet Your Needs
  • Round, Rectangular, Square & Special-Section Wire

Our spring calculator can assist you with design, spring calculations and stress checks.

Calculate Now

Contact Us!

Fill out this form for a quick response from one of our representatives.

We'll Contact You!

Fill out this form for a quick response from one of our representatives.