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Snap-Fit Cantilever

A cantilever snap deflects to clear a lip, then springs back. The design limit is the peak bending strain ε = 1.5·Y·t/L² — it must stay under the material's permissible strain. Constant rectangular section; b width, t thickness, L length, Y deflection.

Length L (mm)

Thickness t (mm)

Width b (mm)

Deflection Y (mm)

Modulus E (MPa)

Perm. strain ε (%)

Friction µ

Lead angle (°)

Strain at Y

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Max allowable deflection

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Deflection / mating force

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Constant-section cantilever (BASF/plastics method); tapered beams allow more deflection. A helper, not a substitute for engineering judgment.