Spring Pitch & Solid Height Calculator

Inputs

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Solve pitch from an existing free length, or solve free length from a desired body pitch.
Diameter of the spring wire.
mm
Coils that deflect. Half-coil values are acceptable for a layout estimate.
Unloaded spring length used to calculate body pitch and travel to solid.
mm
Compression at the checked operating point. Used only for clearance to solid.
mm
Sets the simplified inactive end-coil allowance used for solid height.

Results

Default result
Edit inputs
Body pitch (p)
4.75 mm
Pass

Open body pitch leaves positive active-coil gap at free length.

p = d + (L0 - Ls) / Na.

Also computed

Solid height (Ls) Pass 10 mm

Free length used (L0) 40 mm

Travel to solid (L0 - Ls) Pass 30 mm

Available compression before coil bind.

Active-coil gap (p - d) 3.75 mm

Open body pitch leaves positive active-coil gap at free length.

Working length (L0 - x) 30 mm

Working clearance to solid (L0 - x - Ls) Pass 20 mm

Working point remains clear of solid height.

Method notes 3 notes
  • Solid height uses a simplified end-type stack: closed-ground Ls = d*(Na + 2), closed/squared Ls = d*(Na + 3), open/plain Ls = d*(Na + 1).
  • Body pitch is a first-pass active-coil pitch estimate. End transitions, grinding allowance, preset, tolerances and supplier drawing details can change production geometry.
  • This page does not calculate spring rate, Wahl stress, fatigue, buckling or permanent set. Use the compression spring calculator for load and stress checks.

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