Spring weight calculator
Calculate the developed wire length and the weight per piece and per thousand of your spring. Essential for material cost, plating and freight.
Formula
Hooks, legs and special ends add wire to the developed length. The calculator uses the real engine, which includes those additions.
Simboli
Esempio calcolato
Calcolato dallo stesso motore del calcolatore sopra, con i valori iniziali del modulo.
Weight comes from the developed wire length times the cross-section area times the material density.
Weight per thousand is the basis of raw material cost, of surface treatments priced per kilogram, and of freight estimates.
The designer uses exactly this calculation in quotes, together with the per-operation manufacturing cost.
Moduli e densità dei materiali
| Materiale | Modulo di taglio G | Modulo elastico E | Densità |
|---|---|---|---|
| Acciaio al carbonio (MW) | 11.5 × 10⁶ psi (79.3 GPa) | 29.5 × 10⁶ psi (203.4 GPa) | 7.85 g/cm³ |
| Inox 302 (SS302) | 10.0 × 10⁶ psi (69.0 GPa) | 28.0 × 10⁶ psi (193.0 GPa) | 7.90 g/cm³ |
| Inox 17-7 PH (SS177) | 11.0 × 10⁶ psi (75.8 GPa) | 29.4 × 10⁶ psi (203.0 GPa) | 7.81 g/cm³ |
| Inox 316 (SS316) | 10.0 × 10⁶ psi (69.0 GPa) | 28.0 × 10⁶ psi (193.0 GPa) | 7.98 g/cm³ |
| Temprato in olio (OT) | 11.2 × 10⁶ psi (77.2 GPa) | 29.5 × 10⁶ psi (203.4 GPa) | 7.85 g/cm³ |
| Cromo-silicio (CS) | 11.2 × 10⁶ psi (77.2 GPa) | 29.5 × 10⁶ psi (203.4 GPa) | 7.85 g/cm³ |
| Trafilato duro (HD) | 11.5 × 10⁶ psi (79.3 GPa) | 29.5 × 10⁶ psi (203.4 GPa) | 7.85 g/cm³ |
| Bronzo fosforoso (PB) | 6.0 × 10⁶ psi (41.4 GPa) | 14.9 × 10⁶ psi (103.0 GPa) | 8.86 g/cm³ |
| Rame berillio (BC) | 7.0 × 10⁶ psi (48.3 GPa) | 18.6 × 10⁶ psi (128.0 GPa) | 8.25 g/cm³ |
| Cromo-vanadio (CV) | 11.2 × 10⁶ psi (77.2 GPa) | 29.5 × 10⁶ psi (203.4 GPa) | 7.85 g/cm³ |
Domande frequenti
How is the weight of a spring calculated?
Developed wire length times section area times density: m = ρ·(π·d²/4)·Lw. The developed length is approximately π times the mean diameter times the coil count, plus hooks or legs.
What is the density of spring materials?
Spring steels sit around 7.85 g/cm³, stainless grades around 7.9 g/cm³, and copper alloys such as phosphor bronze and beryllium copper between 8.3 and 8.8 g/cm³.
Why does weight per thousand matter in a quote?
Raw material is bought per kilogram and treatments such as zinc plating are also charged per kilogram. Weight per 1000 pieces turns those costs directly into cost per piece.
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