Pacific Rim

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Continuous Length Extension Springs

continuous length extension springs

Continuous Length Extension Springs are an excellent choice for prototype development or maintenance applications.


  • Wire Diameter and Outside Diameters Match Lee Spring’s most popular Stock extension spring dimensions from .125” (3.18 mm) to 1.125” Outside Diameter (28.58 mm)


  • Music wire with light oil coat
  • 302 Stainless Steel

Lengths Offered

  • 12”
  • 24”
  • 36”

Continuous Length Extension Springs are designed to be cut to a desired length by the user to meet a particular load requirement. Various loops or hooks can be formed on the ends using looping pliers or other appropriate instruments; as wire size increases, use different tools including a vise to hold the coil body and a pry bar to bend up the last coil.

How to Cut Continuous Length Extension Springs

  1. Fold the spring 180° at desired length and cut. Cut shorter than needed by one-half the coil body diameter.
  2. Across from cut end, bend last coil up at 45° angle. To form double loop, bend last two coils up by 45°; do not use heat!
  3. Twist the cut end of loop into the center of the coil body. This may require pliers. You may have to twist past the center to allow the loop to flex back.
  4. Cut end of newly formed loop to obtain any gap needed for mounting.

Special Calculations

  • To determine the spring rate per inch of extension at the final cut length, use the following formula:
    Rate = K / N,
    K = Stiffness Factor as specified for the stock item
    N = “Number of Coils per inch” as specified for the stock item X Final Body Length in inches
  • To determine load at an extended length: multiply deflection by the spring rate and add to the Initial Tension.


Why Choose Lee Spring?

FREE Passivation for Stainless Steel

302, 316 and 17-7 Stock Springs

FREE Plating

on all Music Wire Stock Springs

FREE Grinding

on all Standard Stock Compression Springs

Expert Engineering Assistance

on Stock and Custom Springs

Certificate of Compliance

on all Stock Springs and Custom Springs

Guaranteed RoHS Compliance

on all Stock Springs

Live Customer Service Support

at all Locations

Enhanced CAD Downloads

on Stock Springs Designs

Global Flexibility

allows Lee Spring to find solutions that meet your
geographic requirements wherever your business
takes you in the world