Extension Spring Initial Tension

  • Extension Spring Design Resources – How To Measure Initial Tension In Extension Springs

Measuring the amount of initial tension in an extension springs can be tricky and an often misunderstood process for those unfamiliar with spring manufacturing. Sometimes incoming inspectors will extend the spring until they can "see daylight" between the coils and then measure the load. Some will use other unorthodox methods developed and passed on by inspectors or engineers who they themselves are unfamiliar with spring design.

The proper and most accurate method used by the professional spring maker to determine initial tension is to extend the spring to a given length (L1) insuring coil separation. The spring is then extended an equal distance to (L2). The correct amount of initial tension is equal to two (2) times the load achieved at (L1) minus the load at (L2).

where...
P1 = Load @ L1
P2 = Load @ L2

As an example:
If an extension has a load of 10 pounds when it is extended .500 and a load of 15 pounds when it is extended to 1.000 (and additional .500 of deflection), then the initial tension would be 5 pounds.

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
CUSTOM EXTENSION SPRING QUOTE

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.
Sitemap

A NETWORK OF NEWCOMB SPRING FACILITIES • HEADQUARTERS:  3155 NORTH POINT PARKWAY • ALPHARETTA, GA 30005 • 770-981-2803 • KANDO@NEWCOMBSPRING.COM • © 2021 NEWCOMB SPRING CORP.