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What is the spring rate or spring constant of Extension Springs?

  • If the spring rate c=N/mmis multiplied by the travel s=mm and the preload is added, the spring force F is obtained in Newton F= c*s + F0
  • “Spring rate” and “spring constant” are synonymous terms
  • As a rule there is a linear deflection-force ratio.In the case of extension springs, the linear force-deflection curve can begin at an elevated level due to the pretension generated during winding