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UNS C76200 (CW405J) Nickel Silver

C76200 nickel silver is a copper alloy, further classified a nickel silver. CW405J is the EN numeric designation for this material. C76200 is the UNS number. Additionally, the EN chemical designation is CuNi12Zn29. And the industry name is 59-12 Nickel Silver.

It has seven common variants, each represented as a separate material. The material properties section shows ranges encompassing all variants. To see the details of each variant on a separate page, follow the links in the Variant Materials section further below.

Mechanical Properties

Graph bars compare C76200 nickel silver to other materials. From top to bottom: nickel silver, copper alloys, and the entire database.

Elastic (Young's, Tensile) Modulus

120 GPa 18 x 106 psi

Poisson's Ratio


Rockwell B Hardness

28 to 99

Rockwell Superficial 30T Hardness

66 to 93

Shear Modulus

47 GPa 6.8 x 106 psi

Strength to Weight Ratio

47 to 94 kN-m/kg

Tensile Strength: Ultimate (UTS)

390 to 790 MPa 57 to 110 x 103 psi

Thermal Properties

Melting Onset (Solidus)

980 °C 1800 °F

Specific Heat Capacity

390 J/kg-K 0.094 BTU/lb-°F

Thermal Conductivity

45 W/m-K 26 BTU/h-ft-°F

Thermal Diffusivity

14 m2/s

Thermal Expansion

19 µm/m-K

Other Material Properties

Base Metal Price

49 % relative


8.4 g/cm3 530 lb/ft3

Electrical Conductivity: Equal Volume

9.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.6 % IACS

Electrical Resistivity Order of Magnitude

-7.0 10x Ω-m

Embodied Carbon

3.6 kg CO2/kg material

Embodied Energy

57 MJ/kg 25 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Alloy Composition

Copper (Cu) 57 to 61
Zinc (Zn) 24.2 to 32
Nickel (Ni) 11 to 13.5
Manganese (Mn) 0 to 0.5
Iron (Fe) 0 to 0.25
Lead (Pb) 0 to 0.1
Residuals 0 to 0.5

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Variant Materials

Similar Alloys

Further Reading

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001

ASTM B122: Standard Specification for Copper-Nickel-Tin Alloy, Copper-Nickel-Zinc Alloy (Nickel Silver), and Copper-Nickel Alloy Plate, Sheet, Strip, and Rolled Bar

Copper: Its Trade, Manufacture, Use, and Environmental Status, Gunter Joseph, 2001

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993