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THE FEUTEX TOOLKIT

Helical Compression Spring Model

Estimate rate, deflection and Wahl-corrected wire shear stress.

Mechanical workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
Formulak=Gd⁴/(8D³Na); τ=Kw 8FD/(πd³).
Sources and model references

Worked example

Inputs

Wire diameter
0.005 m
Mean coil diameter
0.04 m
Active turns
8
Shear modulus
80000000000 Pa
Axial load
100 N

Expected results

Spring rate
12207.03125 N/m
Deflection
0.008192 m
Wahl-corrected shear
96482454.87 Pa

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter every input in the labeled units; use measured or independently specified properties.
  2. Check the stated model assumptions before calculating.
  3. Interpret the output as a model estimate and verify it independently for the intended application.

Try this example

{
  "wire": 0.005,
  "coil": 0.04,
  "turns": 8,
  "g": 80000000000,
  "load": 100
}

Accuracy and scope

Round wire, close-coiled linear spring; excludes coil clash, end details, fatigue, buckling and surge. Educational engineering estimate only; not structural or safety certification, equipment selection, or operating recommendations.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.