C651 Silicon Bronze Alloy Wire (CuSi1)

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Alloy C651 is a corrosion resistant copper alloy. It is primarily used as a welding rod and for mechnical fasteners and electrical connections.

English UnitsMetric Units

Mechanical Properties

Round Wire

Temper Name  Temper Code  Tensile Strength (ksi) Mill Limits 
Min Max
Annealed  O61 38 55 .0010 - .1285 inch
1/4 Hard H01 60 75
1/2 Hard H02 75 95
Hard H04 90 110
Spring H08 100  

Square Wire

Temper Name  Temper Code  Tensile Strength (ksi) Mill Limits 
Min Max
Annealed O61  38 55 .0100 - .0808 inch
1/4 Hard H01 60 75
1/2 Hard H02 75 95
Hard H04 90 110
Spring H08 100  

Rolled Flat

Temper Name  Temper Code  Tensile Strength (ksi) Mill Limits 
Min Max
Annealed  O61 40 50

Thickness:
.0100 - .0500 inch

Width:
.0150 - .2500 inch
1/4 Hard H01 42 52
1/2 Hard H02 47 57
Hard H04 60 70
Extra Hard H06 67 76
Spring H08 71 79

Physical Properties

Melting Point (Liquidis) 1940°F
Melting Point (Solidus) 1890°F
Density 0.316 lbs/cu in
Electrical Resistivity (Annealed) 86.4 Ω⋅cmil/ft @ 68°F
Electrical Conductivity (Annealed) 12 % IACS @ 68°F
Thermal Conductivity (Solutionized-Aged) 33 Btu ft/sq ft hr °F @ 68°F
Coefficient of Thermal Expansion 0.0000099°F (68-572°F)
Modulus of Elasticity (Tension) 17000 ksi
Modulus of Rigidity 6400 ksi

For a full size version of product specifications, including chemical composition in both US and Metric units, please download the PDF.