C425 Copper-Zinc-Tin Alloy Wire (CuSn3Zn9)

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Alloy C425 is a low zinc-containing alloy with good combination of tensile strength, electrical conductivity, formability and corrosion resistance. Applications include electrical springs, connectors and terminals.

English UnitsMetric Units

Mechanical Properties

Round Wire

Temper Name Temper Code Tensile Strength (ksi) Mill Limits
Min Max
Annealed   42 52 .0010 - .1285 inch
1/4 Hard H01 57 72
1/2 Hard H02 73 88
3/4 Hard H03 85 100
Hard H04 95 110
Extra Hard H06 105 120
Spring H08 115  

Square Wire

Temper Name  Temper Code  Tensile Strength (ksi) Mill Limits 
Min Max
Annealed   42 52 .0100 - .0808 inch
1/4 Hard H01 57 72
1/2 Hard H02 73 88
3/4 Hard H03 85 100
Hard H04 95 110
Extra Hard H06 105 120
Spring H08 115  

Rolled Flat

Temper Name Temper Code Tensile Strength (ksi) Mill Limits
Min Max
Annealed   40 50

Thickness:
.0100 - .0500 inch

Width:
.0150 - .2500 inch
1/4 Half Hard H01 49 59
1/2 Hard H02 57 69
3/4 Hard H03 62 74
Hard H04 70 82
Extra Hard H06 76 88
Spring H08 84 94
Extra Spring H10 92  

Physical Properties

Melting Point (Liquidis) 1890°F
Melting Point (Solidus) 1850°F
Density 0.316 lbs/cu in
Electrical Resistivity (Annealed) 37 Ω⋅cmil/ft @ 68°F
Electrical Conductivity (Annealed) 28% IACS @ 68°F
Thermal Conductivity (Solutionized-Aged) 69 Btu ft/sq ft hr °F @ 68°F
Coefficient of Thermal Expansion 0.0000102°F (68-572°F)
Modulus of Elasticity (Tension) 16000 ksi