Continuous Length Extension Springs

Materials

• 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.