CuSn8P
CW453KHigh-tin phosphor bronze — Sn 7.5-8.5% + P 0.01-0.4%. Higher Sn than CuSn6 = higher strength (UTS 600-800 MPa spring-hard) and better wear resistance. THE spring connector and bearing bronze. Used for precision springs, connectors, switch parts, sliding bearings, and membranes. Excellent fatigue resistance. Also known as PB102 (BS) / C52100.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS C52100 | C52100 | REF |
| 🇪🇺 | EN | Europe | CuSn8 / CW453K | CW453K | 100% |
Sources: ASTM B103, EN 1654
Chemical composition comparison (wt%)
Side-by-side: CuSn8P (EN) (EN 1654) vs CuSn8 / CW453K (EN) (EN 1654)
| Element | CuSn8P (EN) | CuSn8 / CW453K (EN) | Overlap |
|---|---|---|---|
| P | 0.01–0.4% | 0.01–0.4% | OK |
| Cu | — | — | — |
| Sn | 7.5–8.5% | 7.5–8.5% | OK |
Mechanical properties
Spring Hard
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 600–800 | MPa |
| Yield Strength | 500–700 | MPa |
| Elongation | 2–5 | % |
Annealed
| Property | Value | Unit |
|---|---|---|
| Elastic Modulus | ≥ 110 | GPa |
| Density | ≥ 8.8 | g/cm3 |
Compatibility verdict
CuSn8P and CuSn8 / CW453K: 100% composition match
Close equivalents but NOT identical.
Related materials
CuZn37
2.0321Lead-free alpha/alpha+beta brass (63% Cu, 37% Zn). Compromise between cold formability (CuZn35) and hot formability (CuZn40). The most widely used unleaded brass. Used for cartridge cases, radiator cores, lamp components, plumbing fixtures, and decorative hardware.
CuZn36Pb3
CW603NFree-cutting leaded brass — the benchmark for non-ferrous machinability (rated 100%). Lead particles act as chip breakers for excellent surface finish. Used for screw machine parts, fittings, valves, watch components, precision mechanics, and electrical connectors. Old DIN number 2.0375.
CuSn6
CW452KPhosphor bronze with 6% tin — better cold formability than CuSn8 at slightly lower strength. Excellent spring properties and fatigue resistance. Used for electrical connectors, spring contacts, switch parts, bellows, bourdon tubes, and precision springs.
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