// multi-utility computation suite · offline · instant · precise
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eng.spring-design-Wahl-factor Calculator
Calculates helical spring stress using the Wahl stress correction factor (which accounts for curvature and direct shear) from wire diameter, coil diameter, and load. The Wahl factor K = (4C−1)/(4C−4) + 0.615/C corrects the simple torsion formula for the stress concentration at the inner wire surface.
Inputs
D Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
D Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
N Coils
Reference formula or conversion factor shown for context.
G Gpa
Reference formula or conversion factor shown for context.
Delta Mm
Reference formula or conversion factor shown for context.
Results
spring rate k (N/mm)
The value at the specified point or condition.
spring force at δ (N)
The value at the specified point or condition.
Wahl correction factor Kw
A dimensionless multiplier applied in the calculation.
corrected shear stress τ (MPa)
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
k = Gd⁴/(8D³n)
Sample size or count used in the calculation.
spring index C = D/d
A normalised score comparing the result to a reference baseline.