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Helical Compression Spring Calculator

Physical Properties
GPa
m/s²
Earth: 9.81, Moon: 1.62, Mars: 3.71
Spring Dimensions
mm
mm
mm
mm
{{ deflectionManuallyModified ? 'Manual override' : 'Auto-computed' }}: {{ computedDeflection.toFixed(2) }} mm
Calculated Results
Please enter all parameters to see calculations.
Spring Index (C):
{{ springIndex.toFixed(2) }}
Spring Constant (k):
{{ springConstant.toFixed(2) }} N/mm
Compression Force (F):
{{ compressionForceMin.toFixed(2) }} - {{ compressionForceMax.toFixed(2) }} N
{{ (compressionForceMin / gravity).toFixed(3) }} - {{ (compressionForceMax / gravity).toFixed(3) }} kg
Compressed Length:
{{ compressedLength.toFixed(2) }} mm
Max Shear Stress:
{{ maxShearStress.toFixed(1) }} MPa
Warning: Spring index (C) is less than 4. This may result in manufacturing difficulties and stress concentrations.
Warning: Spring index (C) is greater than 12. The spring may be unstable under compression.
Formulas Used
Spring Index: C = Dd
Spring Constant: k = Gd8D³N
Compression Force: F = k × δ
Max Shear Stress: τ = 8FDπd³ × K
Stress Factor: K = 4C-14C-4 + 0.615C