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Spring Design Calculator (Compression Spring)

Compression Spring — Design & Performance Calculator

Units: mm (lengths), N (force), MPa = N/mm² (stress). Enter shear modulus G in GPa (e.g. 79 for steel spring wire ≈ 79 GPa).

Mode

Geometry → Performance

Wire diameter, d [mm] Mean coil diameter, D [mm] Active coils, N_a

Shear modulus, G [GPa] Free length L_free [mm] (optional) Total coils for solid length (N_t) — default = N_a + 2

Load (force) F [N] Max allowable shear stress (for safety check) [MPa] (optional) Friction coefficient for axial loss? (not used; info only)

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