CuSn8P

CW453K

Copper & Brassphosphor_bronze

High-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

Mechanical properties — Pro

Spring Hard

Property	Value	Unit
Tensile Strength
Yield Strength
Elongation

Annealed

Property	Value	Unit
Elastic Modulus
Density

Related materials

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🇪🇺 CuZn37 / CW508L🇯🇵 C2720🇬🇧 CZ107 (old)

CuZn36Pb3

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Free-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.

🇪🇺 CuZn36Pb3🇬🇧 CZ124

CuSn6

CW452K

Phosphor bronze

Phosphor 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.

🇪🇺 CuSn6

More Phosphor Bronze materials →

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All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.