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  • Stainless steel = IX
  • Standard steel = AC
  • Ground (Fig. 1) = M
  • Unground (Fig. 2) = NM
  • d: wire diameter in mm
  • Da:  outer diameter in mm
  • L0: free length in mm
  • Pn: maximum load under Ln in Newton (N)
  • Ln: maximum compression length in mm
  • Lbl: block length in mm
  • C: Spring rate N/mm
  • Stainless steel = IX
  • Standard steel = AC
  • d: wire diameter in mm
  • Da: outside diameter in mm
  • L0: free length between loops in mm
  • Pn: maximum load under Ln in Newton (N)
  • Ln: maximum length under load Pn in mm
  • C: Spring rate N/mm