Music Wire Spring Calculator

Inputs

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ASTM A228 music wire diameter.
mm
Center-to-center coil diameter. Outside diameter is D + d.
mm
Coils that deflect under load.
Unloaded spring length used for travel-to-solid.
mm
Compression at the working load point.
mm
Sets inactive end coils and solid height.

Results

Default result
Edit inputs
Spring rate(k)
1.239N/mm

Also computed

Spring index(C)Pass10

Corrected shear stress(tau)Pass361.2MPa

Below music-wire static allowable stress.

Allowable shear stress995MPa

Estimated tensile strength(Sut)2,211MPa

Force at deflection(F)12.39N

2.786 lbf

Solid height(Ls)10mm

Force vs DeflectionThis load line uses ASTM A228 music-wire material assumptions and stops at the calculated travel-to-solid.Force vs Deflection0102030400102030workingDeflection (mm)Force (N)
This load line uses ASTM A228 music-wire material assumptions and stops at the calculated travel-to-solid.
Method notes 3 notes
  • Material is fixed to ASTM A228 music wire with G = 79.3 GPa and static allowable shear stress taken as 45% of estimated tensile strength.
  • Music wire is high-strength cold-drawn carbon steel and is commonly limited to about 250 F / 121 C service temperature.
  • Static check only: fatigue, set, shot peening, corrosion, relaxation and supplier tolerances are not modeled.

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