INDUSTRIAL SPRINGS
Industrial Engineers & Springmakers (Sales) Pty. Ltd.

SPRING CALCULATIONS


How to Calculate the Spring Rate of a Coil Spring-


  (9909 x material dia.² x material dia.²)
Rate = _____________________________
  (no. of active coils x mean dia.³)
  • Mean dia. = I.D. + material dia.
  • All measurements are in millimetres
  • Result is in N/mm
  • To convert answer to Kg/mm = N/mm x 0.10192

To Calculate Coil Spring Stress-


  (2.545 x rate(N/mm) x required travel x mean dia. x Wahl factor)
Stress = ______________divided by______________
  (material dia.³)
  • Mean dia. = I.D. + material dia.
  • C: (spring index) = mean dia. / material dia.
  • Wahl factor = (C+0.2) / (C-1)
  • All measurements are in millimetres
  • Results is in N/mm² / MPa
  • Stress not to exceed 827 N/mm² / MPa
Privacy Policy | Quality Policy | OHS Policy | Warranty