What expansion does a Compression Spring exhibit upon compression?

• Compression springs expand when they are compressed
• The enlargement of the outside diameter under load deltaDA in mm is calculated with solid height LbI and free bearing of the spring ends:     deltaDa= 0.1*m²-0.8md-0.2d²/Dm 
• m=Lo-d/if for springs with squared and ground ends and m=Lo-2.5d/if for springs with unsquared, unground ends
• d = wire diameter [mm]
  Dm = average coil diameter [mm]
  Lo = length of unloaded spring [mm]
  if = number of spring coils
  Lbl = solid length [mm]
• We offer as download a free calculation program for compression springs on our homepage, in which the expansion of the compression springs can be calculated