Constantan Electrical Resistance Wire

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The constantan electrical resistance wire is a type of resistance alloy that is mainly produced using copper and nickel. It is primarily intended for making variable and strain resistance elements in AC instruments. The wire offers low temperature coefficient of resistance (TCR) and can be used in a wide range of temperatures below 500 ℃. Additionally, it has good processability, weldability, and corrosion resistance.

Chemical Composition
Name Code Main Composition (%) Density
Cu Mn Ni Cr g/mm2
Constantan 6J40 Bal. 1~2 39~41 - 8.9

Product Properties
Type (20℃)
Resistivity
(μΩ.m)
(20℃)
Temp. Coeff. of Resistance (αX10-6/℃)
(0~100℃) Thermal EMF against Copper
(μv/℃)
Max. Working Temp.(℃) Elongation
(%)
Tensile Strength
(N/mm2)
6J40 0.48±0.03 ≤±40 45 ≤500 ≥15 ≥390

Technical Data
Dia. (mm) Cross-sectional area (mm2) Weight/Meter
(g/m)
Resistance/Meter at 20℃ (Ω/m) Dia. (mm) Cross-sectional area (mm2) Weight/Meter
(g/m)
Resistance/Meter at 20℃ (Ω/m)
0.020 0.000314 0.00279 1375-1681 0.224 0.03941 0.350 11.4-12.9
0.022 0.000318 0.00337 1136-1389 0.250 0.04909 0.436 9.19-10.37
0.025 0.000491 0.00434 880-1076 0.280 0.06158 0.5468 7.33-8.26
0.028 0.000616 0.00547 702-857 0.315 0.07793 0.6920 5.85-6.47
0.032 0.000804 0.00714 549-645 0.355 0.9898 0.8789 4.61-5.09
0.036 0.001018 0.00904 434-509 0.400 0.1257 1.116 3.63-4.01
0.040 0.001257 0.01116 351-413 0.450 0.1590 1.412 2.87-3.17
0.045 0.001509 0.01412 278-326 0.500 0.1963 1.744 2.32-2.57
0.050 0.001963 0.01744 225-264 0.560 0.2463 2.19 1.87-2.03
0.056 0.002463 0.02187 179-210 0.630 0.3117 2.77 1.48-1.60
0.063 0.003117 0.02768 142-166 0.710 0.3959 3.52 1.16-1.26
0.071 0.003959 0.03516 112-131 0.750 0.4418 3.92 1.04-1.13
0.080 0.005027 0.04464 87.9-103.1 0.800 0.5027 4.46 0.917-0.993
0.090 0.006362 0.0565 69.4-81.5 0.850 0.5674 5.04 0.812-0.880
0.100 0.007854 0.0697 56.2-66.0 0.900 0.6362 5.65 0.724-0.785
0.112 0.009852 0.08749 45.3-52.1 0.950 0.7088 6.29 0.650-0.704
0.125 0.01227 0.1090 36.4-41.9 1.000 0.7854 6.97 0.587-0.636
0.140 0.01539 0.1367 29.0-33.4 1.060 0.8825 7.84 0.522-0.566
0.150 0.01767 0.1569 25.3-29.1 1.120 0.9852 8.75 0.468-0.507
0.160 0.02011 0.1785 22.2-25.5 1.180 1.094 9.71 0.421-0.456
0.170 0.02270 0.2016 19.7-22.6 1.250 1.227 10.90 0.375-0.407
0.180 0.02545 0.2260 17.5-20.2 1.320 1.368 12.15 0.337-0.365
0.190 0.02835 0.252 15.7-18.1 1.400 1.539 13.67 0.299-0.324
0.200 0.03142 0.2790 14.4-16.2 1.500 1.767 15.69 0.261-0.282
0.212 0.03530 0.3135 12.8-14.4 1.600 2.011 17.86 0.229-0.248

Size Range
Wire Diameter and Tolerance
Diameter(mm) 0.02~0.028 0.032~0.10 0.112~0.28 0.315~0.50 0.56~1.0 1.06~1.60 1.70~2.12 2.24~3.00 3.15~4.50
Tolerance
(mm)
±0.002 ±0.003 ±0.005 ±0.010 ±0.015 ±0.020 ±0.025 ±0.030 ±0.035

Strip
Thickness: 0.18mm-2.0mm
Width: 6.3mm-40mm

Senphus is a professional constantan electrical resistance wire manufacturer and supplier in China. We offer a wide range of products, including Fe-CuNi (constantan) thermocouple wire (type J), underfloor heating cable mat, silicone rubber heating plate, and more.

Related Names:
Corrosion Resistant Wire | Resistance Wire with Low Temperature Dependence

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