CuNi44
CuNi44 Resistance Wire
The workhorse of the copper-nickel resistance family: high resistivity for a copper alloy, good corrosion resistance, and it solders easily — which is…
Product family
Copper-Nickel Resistance Wire
A graded series rather than a single alloy — resistivity from roughly 0.03 to 0.50 µΩ·m, so the value can be chosen instead of worked around.
0.018–6.00Diameter, mm
1 kgMinimum order
3–7 dLead time
100 gSample at cost
| Grade | Nominal Ni | Resistivity, 20 °C | Typical use |
|---|---|---|---|
| NC003 / CuNi3 | ≈ 3 % | ≈ 0.05 µΩ·m | Low-resistance conductors |
| NC012 / CuNi10 | ≈ 10 % | ≈ 0.15 µΩ·m | Instrument leads |
| NC025 / CuNi23 | ≈ 23 % | ≈ 0.30 µΩ·m | Braking and load resistors |
| NC050 / CuNi44 | ≈ 44 % | ≈ 0.49 µΩ·m | Shunts, heating cable |
The point of a graded series is that a designer can pick the resistance instead of accepting whatever one alloy gives him. Between the low-nickel and high-nickel ends the resistivity moves by an order of magnitude, while workability and solderability stay reasonable throughout.
Where the series is used
- Shunt, load-bank and braking resistors
- Heating cable conductors
- Low-temperature heating elements
- Instrument and sensor leads
Values shown are nominal
The table above is for selection. Exact resistivity for a given grade is confirmed at quotation against the standard we are producing to, and is stated on the inspection report.
Grades in this family
Pick the designation your drawing cites
Questions we get asked
Which CuNi grade replaces constantan?
CuNi44 / NC050 is the closest in resistivity and behaviour; for thermocouple use, specify the constantan designation instead because the EMF against copper is controlled.
Can I get several grades in one order?
Yes, and it is common — designers often qualify two grades at once. Each grade is packed and labelled separately.
Send the specification — diameter, grade, temper, quantity.
We come back with a confirmed lead time and the documentation we can issue for the shipment. 100 g sample at cost; orders from 1 kg.
Request a quotation Order a 100 g sample