Helical Spring Rate
Helical Spring Design Resources – What Is It & How to Determine Spring Rate?
Spring rate is the change in load per unit of deflection and may be determined using the following procedure:
1. Deflect* the spring approximated 20% of the available deflection and measure the load (P1) and the height (L1).
2. Deflect* the spring approximately 80% of the available deflection and measure the load (P2) and the height (L2).
3. Calculate the rate (lbs/inch) or (N/mm) by using the following formula:
R=
(P2 - P1)
(L1 - L2)
*To deflect a spring one would apply or remove an external load, causing the spring ends/arms to move.
Please contact the Newcomb Spring facility nearest you for more information on spring rate and other considerations of spring design.