CuSn4
CW450KLow-tin phosphor bronze — the standard connector and spring material in the CuSn series. 4% Sn gives good spring properties, corrosion resistance, and electrical conductivity. Better electrical conductivity than higher-Sn bronzes. Used for connectors, contact springs, switch parts, and precision bellows. ≈ UNS C51000.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS C51000 (Phosphor Bronze A) | C51000 | REF |
| 🇪🇺 | EN | Europe | CuSn4 | CW450K | 100% |
Sources: ASTM B103, EN 1652
Mechanical properties — Pro
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
| Yield Strength | ||
| Elongation | ||
| Hardness HB | ||
| Elastic Modulus | ||
| Density |
H04 Half Hard
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
| Yield Strength | ||
| Elongation |
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