Disc (Belleville washer) spring

Stress, deflection and stiffness of a Belleville disc spring, from outer/inner diameter, thickness and material properties.

✓ validated against legacyoriginal: /calculators/t14_6.htm

Spring outer diameter, D = 2r10⁻³ mSpring inner diameter, D₀ = 2r₀10⁻³ mSpring thickness, δ10⁻³ mModulus of elasticity, E10⁹ PaSpring force, FN

Tensile stress, σ64.44 10⁶ Pa

Spring deflection, f0.02 10⁻³ m

Spring stiffness, k = dF/df = F/f5743.59 10³ N/m

Method & references

Belleville (disc) washer spring — stress and deflection.

The computation is a literal port of the original client-side JavaScript from /calculators/t14_6.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.

Disc (Belleville washer) spring — Engineering ABC