6J40 Constantan Flat Wire Precision Wire for Electronics Manufacturing and Scientific Instrumentation
The 6J40 Constantan flat wire is a specific type of Constantan (a copper-nickel alloy), commonly used in precision applications requiring stable electrical resistance, durability, and resistance to temperature variations. This wire is typically used in applications like thermocouples, resistors, strain gauges, and heating elements, among others.
The 6J40 Constantan flat wire is a versatile material known for its stable electrical resistance, mechanical durability, and corrosion resistance. These key features make it highly suitable for precision applications like thermocouples, resistors, and heating elements where consistent performance and long-term reliability are essential. Its combination of thermoelectric properties, low temperature coefficient, and durability ensures it is an ideal choice for high-precision industrial, scientific, and commercial applications.
Chemical composition
| Name |
Code |
Main Composition(%) |
Density |
| Cu |
Mn |
Ni |
Cr |
g/mm2 |
| Constantan |
6J40 |
Bal. |
1~2 |
39~41 |
-- |
8.9 |
Properties
| Name |
Code |
Resistivity(20℃)(μΩm) |
Temp.Coeff.Of Resistance (20℃)(α×10-6/℃) |
(0~100℃) Thermal EMF vs. Copper (μv/℃) |
Max. Working Temp. (℃) |
Elongation(%) |
Tensile Strength(N/mm2) |
| Constantan |
6J40 |
0.48±0.03 |
-40~+40 |
45 |
≤500 |
≥15 |
≥390 |
Diameter and Tolerance
| Diameter |
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 |
±0.002 |
±0.003 |
±0.005 |
±0.010 |
±0.015 |
±0.020 |
±0.025 |
±0.030 |
±0.035 |
Some key features of 6J40 include:
1. Stable Electrical Resistance:
- Constantan is renowned for its stable resistance across a wide temperature range. The 6J40 flat wire variant offers a low temperature coefficient of resistance, which means that its electrical resistance does not change significantly with temperature fluctuations.
- This makes it ideal for precision applications such as temperature sensors (thermocouples) and resistors where consistent performance is crucial.
2. Alloy Composition:
- The 6J40 Constantan wire is an alloy of approximately 55% copper and 45% nickel, which provides a balanced combination of electrical properties and mechanical strength. This composition results in a wire that is highly resistant to corrosion and wear, ensuring long-term reliability in demanding environments.
3. Durability and Strength:
- 6J40 Constantan flat wire is mechanically strong and durable, making it resistant to physical wear and tear. Its ability to withstand high temperatures and stress makes it suitable for use in heating elements, electrical contacts, and other high-performance industrial applications.
4. High Precision and Accuracy:
- Due to its stable resistance and low temperature coefficient, the 6J40 flat wire is particularly useful in precision measurement applications. It’s commonly used in resistors, strain gauges, and load cells, where accuracy and repeatability are paramount.
5. Corrosion Resistance:
- The copper-nickel composition gives 6J40 Constantan excellent corrosion resistance, making it suitable for use in environments exposed to moisture, chemicals, or other harsh conditions. This feature is essential in outdoor or industrial applications where the wire may be exposed to environmental stresses.
6. Non-magnetic Properties:
- Constantan alloys, including 6J40, are non-magnetic, which makes them ideal for applications where magnetic interference needs to be avoided, such as in sensitive electrical devices, instrumentation, or magnetically sensitive environments.
7. Thermoelectric Properties (Thermocouples):
- Due to its thermoelectric properties, 6J40 Constantan is widely used in thermocouples (temperature sensors), where it is paired with other metals like Chromel (nickel-chromium) to form a temperature-measuring junction. The Seebeck effect generates a voltage based on temperature differences between the metals, which is used to determine temperature.
8. Formability:
- The flat wire form of 6J40 Constantan makes it easy to shape or wind into various configurations for specific applications. Its ductility allows for easy manipulation, which is beneficial for use in intricate sensor devices, wire-wound resistors, and precision electronics.
9. Temperature Range:
- 6J40 Constantan can operate effectively across a wide temperature range, typically from -200°C to 250°C (or higher, depending on the specific application), making it suitable for both low and high-temperature environments.
Applications:
- Thermocouples: Used for temperature measurement in industrial and scientific applications.
- Resistors and Strain Gauges: Common in high-precision electronics and instrumentation for accurate measurements.
- Heating Elements: Employed in resistance heating applications where high electrical resistance is needed for heat generation.
- Load Cells: Used in weighing systems and force measurement instruments.
- Electrical Components: Used in electrical contacts, precision resistors, and other sensitive components that require stable resistance.
Constantan (6J40) Technical data of wires
| Dia(m) |
Cross-sectional area(m²) |
Weight/m (g/m) |
Resistance/m at 20℃(Ω/m) |
Dia(m) |
Cross-sectional area(m²) |
Weight/m (g/m) |
Resistance/m 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 |
0.09898 |
0.8789 |
4.61-5.09 |
| 0.036 |
0.001018 |
0.00904 |
434-509 |
0.400 |
0.12570 |
1.116 |
3.63-4.01 |
| 0.040 |
0.001257 |
0.01116 |
351-413 |
0.450 |
0.15900 |
1.412 |
2.87-3.17 |
| 0.045 |
0.001509 |
0.01412 |
278-326 |
0.500 |
0.19630 |
1.744 |
2.32-2.57 |
| 0.050 |
0.001963 |
0.01744 |
225-264 |
0.560 |
0.24630 |
2.19 |
1.87-2.03 |
| 0.056 |
0.002463 |
0.02187 |
179-210 |
0.630 |
0.31170 |
2.77 |
1.48-1.60 |
| 0.063 |
0.003117 |
0.02768 |
142-166 |
0.710 |
0.39590 |
3.52 |
1.16-1.26 |
| 0.071 |
0.003959 |
0.03516 |
112-131 |
0.750 |
0.44180 |
3.92 |
1.04-1.13 |
| 0.080 |
0.005027 |
0.04464 |
87.9-103.1 |
0.800 |
0.50270 |
4.46 |
0.917-0.993 |
| 0.090 |
0.006362 |
0.05650 |
69.4-81.5 |
0.850 |
0.56740 |
5.04 |
0.812-0.880 |
| 0.100 |
0.007854 |
0.06970 |
56.2-66.0 |
0.900 |
0.63620 |
5.65 |
0.724-0.785 |
| 0.112 |
0.009852 |
0.08749 |
45.3-52.1 |
0.950 |
0.70880 |
6.29 |
0.650-0.704 |
| 0.125 |
0.012270 |
0.10900 |
36.4-41.9 |
1.000 |
0.78540 |
6.97 |
0.587-0.636 |
| 0.140 |
0.015390 |
0.13670 |
29.0-33.4 |
1.060 |
0.88250 |
7.84 |
0.522-0.566 |
| 0.150 |
0.017670 |
0.15690 |
25.3-29.1 |
1.120 |
0.98520 |
8.75 |
0.468-0.507 |
| 0.160 |
0.020110 |
0.17850 |
22.2-25.5 |
1.180 |
1.09400 |
9.71 |
0.421-0.456 |
| 0.170 |
0.022700 |
0.20160 |
19.7-22.6 |
1.250 |
1.22700 |
10.9 |
0.375-0.407 |
| 0.180 |
0.025450 |
0.22600 |
17.5-20.2 |
1.320 |
1.36800 |
12.15 |
0.337-0.365 |
| 0.190 |
0.028350 |
0.25200 |
15.7-18.1 |
1.400 |
1.53900 |
13.67 |
0.299-0.324 |
| 0.200 |
0.031420 |
0.27900 |
14.4-16.2 |
1.500 |
1.76700 |
15.69 |
0.261-0.282 |
| 0.212 |
0.035300 |
0.31350 |
12.8-14.4 |
1.600 |
2.01100 |
17.86 |
0.229-0.248 |
Constantan strip resistance value (Ω/m)
Width
Thickness |
6.3 |
8.0 |
10.0 |
12.5 |
16.0 |
20.0 |
25.0 |
31.5 |
40.0 |
| 0.180 |
0.150 |
|
|
|
|
|
|
|
|
| 0.200 |
0.405 |
|
|
|
|
|
|
|
|
| 0.224 |
0.362 |
0.2850 |
|
|
|
|
|
|
|
| 0.250 |
0.324 |
0.2550 |
0.196 |
|
|
|
|
|
|
| 0.280 |
0.289 |
0.2280 |
0.175 |
|
|
|
|
|
|
| 0.315 |
0.257 |
0.2030 |
0.155 |
0.124 |
|
|
|
|
|
| 0.355 |
0.228 |
0.1800 |
0.138 |
0.110 |
|
|
|
|
|
| 0.400 |
0.203 |
0.1600 |
0.122 |
0.980 |
0.0765 |
|
|
|
|
| 0.450 |
0.180 |
0.1420 |
0.109 |
0.0871 |
0.0680 |
0.0544 |
0.0435 |
|
|
| 0.500 |
0.162 |
0.1280 |
0.098 |
0.0784 |
0.0612 |
0.0490 |
0.0392 |
|
|
| 0.560 |
0.145 |
0.1140 |
0.0875 |
0.0700 |
0.0547 |
0.0437 |
0.0350 |
|
|
| 0.630 |
0.129 |
0.1010 |
0.0777 |
0.0622 |
0.0486 |
0.0389 |
0.0311 |
|
|
| 0.710 |
0.114 |
0.0900 |
0.0690 |
0.0552 |
0.0431 |
0.0345 |
0.0276 |
|
|
| 0.800 |
0.101 |
0.0800 |
0.0612 |
0.0490 |
0.0383 |
0.0306 |
0.0245 |
0.0194 |
0.0153 |
| 0.900 |
0.090 |
0.0710 |
0.0544 |
0.0435 |
0.0340 |
0.0272 |
0.0218 |
0.0173 |
0.0136 |
| 1.000 |
0.081 |
0.0640 |
0.0490 |
0.0392 |
0.0306 |
0.0245 |
0.0196 |
0.0155 |
0.0122 |
| 1.120 |
0.072 |
0.0570 |
0.0437 |
0.0350 |
0.0273 |
0.0219 |
0.0175 |
0.0139 |
0.0109 |
| 1.250 |
0.065 |
0.0510 |
0.0392 |
0.0313 |
0.0245 |
0.0196 |
0.0157 |
0.0124 |
0.0098 |
| 1.400 |
0.058 |
0.0460 |
0.0350 |
0.0280 |
0.0219 |
0.0175 |
0.0140 |
0.0111 |
0.0088 |
| 1.600 |
0.051 |
0.0400 |
0.0306 |
0.0245 |
0.0191 |
0.0153 |
0.0122 |
0.0097 |
0.0077 |
| 1.800 |
0.045 |
0.0350 |
0.0272 |
0.0218 |
0.0170 |
0.0136 |
0.0109 |
0.0086 |
0.00680 |
| 2.000 |
0.041 |
0.0320 |
0.0245 |
0.0196 |
0.0153 |
0.0122 |
0.0098 |
0.0078 |
0.0061 |
Constantan&Manganin wire table
| Dia.(mm) |
Sectional area nominal value(mm2) |
Resistance per meter (Ω/m) |
| 6J12X |
6J8X |
6J13X |
6J40X |
| Nominal value(mm) |
Tolerance |
Nominal value (Ω/m) |
Tolerance |
Nominal value (Ω/m) |
Tolerance |
Nominal value (Ω/m) |
Tolerance |
Nominal value (Ω/m) |
Tolerance |
| 0.020 |
±0.002 |
0.000314 |
1496 |
±10% |
|
|
|
|
1528 |
±10% |
| 0.022 |
0.000380 |
1236 |
1263 |
| 0.025 |
0.000491 |
957 |
978 |
| 0.028 |
0.000616 |
763 |
780 |
| 0.032 |
±0.003 |
0.000804 |
584 |
±8% |
|
±8% |
|
±8% |
597 |
±8% |
| 0.036 |
0.001018 |
462 |
472 |
| 0.040 |
0.001257 |
374 |
382 |
| 0.045 |
0.001590 |
296 |
302 |
| 0.050 |
0.001963 |
239 |
244 |
| 0.056 |
0.002463 |
191 |
195 |
| 0.063 |
0.003117 |
151 |
154 |
| 0.071 |
0.003959 |
119 |
121 |
| 0.080 |
0.005027 |
93.5 |
69.6 |
87.5 |
95.5 |
| 0.090 |
0.006362 |
73.9 |
55.0 |
69.2 |
75.5 |
| 0.100 |
0.007854 |
59.8 |
44.6 |
56.0 |
61.1 |
| 0.112 |
±0.005 |
0.009852 |
47.7 |
±7% |
35.5 |
±7% |
44.7 |
±7% |
48.7 |
±7% |
| 0.125 |
0.01227 |
38.3 |
28.5 |
35.9 |
39.1 |
| 0.140 |
0.01539 |
30.5 |
22.7 |
28.6 |
31.2 |
| 0.160 |
0.02011 |
23.4 |
17.4 |
21.9 |
23.9 |
| 0.180 |
0.02545 |
18.5 |
13.8 |
17.3 |
18.9 |
| 0.200 |
±0.005 |
0.03142 |
15.0 |
±6% |
11.1 |
±6% |
14.0 |
±6% |
15.3 |
±6% |
| 0.224 |
0.03941 |
11.9 |
8.88 |
11.2 |
12.2 |
| 0.250 |
0.04909 |
9.57 |
7.13 |
8.96 |
9.78 |
| 0.280 |
0.06158 |
7.63 |
5.68 |
7.15 |
7.80 |
| 0.315 |
±0.010 |
0.007793 |
6.03 |
±5% |
4.49 |
±5% |
5.65 |
±5% |
6.16 |
±5% |
| 0.355 |
0.09898 |
4.75 |
3.54 |
4.45 |
4.85 |
| 0.400 |
0.1257 |
3.74 |
2.79 |
3.50 |
3.82 |
| 0.450 |
0.1590 |
2.96 |
2.20 |
2.77 |
3.02 |
| 0.500 |
±0.015 |
0.1963 |
2.39 |
±4% |
1.78 |
±4% |
2.24 |
±4% |
2.44 |
±4% |
| 0.560 |
0.2463 |
1.91 |
1.42 |
1.79 |
1.95 |
| 0.630 |
0.3117 |
1.51 |
1.12 |
1.41 |
1.51 |
| 0.710 |
0.3959 |
1.19 |
0.884 |
1.11 |
1.21 |
| 0.750 |
0.4418 |
1.06 |
0.792 |
1.00 |
1.09 |
| 0.800 |
0.5027 |
0.935 |
0.696 |
0.875 |
0.955 |
| 0.850 |
0.5674 |
0.828 |
0.617 |
0.775 |
0.846 |
| 0.900 |
0.6362 |
0.739 |
0.550 |
0.692 |
0.755 |
| 0.950 |
0.7088 |
0.663 |
0.494 |
0.621 |
0.677 |
| 1.000 |
0.7854 |
0.598 |
0.446 |
0.560 |
0.611 |
| 1.060 |
±0.020 |
0.8852 |
0.533 |
±4% |
0.397 |
±4% |
0.499 |
±4% |
0.544 |
±4% |
| 1.120 |
0.9852 |
0.477 |
0.355 |
0.447 |
0.487 |
| 1.180 |
1.094 |
0.430 |
0.320 |
0.402 |
0.439 |
| 1.250 |
1.227 |
0.383 |
0.285 |
0.359 |
0.391 |
| 1.320 |
1.368 |
0.343 |
0.256 |
0.322 |
0.351 |
| 1.400 |
1.539 |
0.305 |
0.227 |
0.286 |
0.312 |
| 1.500 |
1.767 |
0.266 |
0.198 |
0.249 |
0.272 |
| 1.600 |
2.011 |
0.234 |
0.174 |
0.219 |
0.239 |
| 1.700 |
±0.025 |
2.270 |
0.207 |
±4% |
0.154 |
±4% |
0.194 |
±4% |
0.211 |
±4% |
| 1.800 |
2.545 |
0.185 |
0.138 |
0.173 |
0.189 |
| 1.900 |
2.835 |
0.166 |
0.123 |
0.155 |
0.169 |
| 2.000 |
3.142 |
0.15 |
0.111 |
0.140 |
0.153 |
| 2.120 |
3.530 |
0.133 |
0.0992 |
0.125 |
0.136 |
| 2.240 |
±0.030 |
3.941 |
0.119 |
±4% |
0.0888 |
±4% |
0.112 |
±4% |
0.122 |
±4% |
| 2.360 |
4.374 |
0.107 |
0.0800 |
0.101 |
0.110 |
| 2.500 |
4.909 |
0.0957 |
0.0713 |
0.0896 |
0.0978 |
| 2.650 |
5.515 |
0.0852 |
0.0635 |
0.0798 |
0.0870 |
| 2.800 |
6.158 |
0.0763 |
0.0568 |
0.0715 |
0.0780 |
| 3.000 |
7.069 |
0.0665 |
0.0495 |
0.0622 |
0.0679 |
| 3.150 |
±0.035 |
7.793 |
0.0603 |
±4% |
0.0449 |
±4% |
0.0565 |
±4% |
0.0616 |
±4% |
| 3.350 |
8.814 |
0.0533 |
0.0397 |
0.0499 |
0.0545 |
| 3.550 |
9.898 |
0.0475 |
0.0354 |
0.0445 |
0.0485 |
| 3.750 |
11.04 |
0.0426 |
0.0317 |
0.0398 |
0.0435 |
| 4.000 |
12.57 |
0.0374 |
0.0279 |
0.0350 |
0.0382 |
| 4.250 |
14.19 |
0.0331 |
0.0247 |
0.0310 |
0.0338 |
| 4.500 |
15.90 |
0.0296 |
0.0220 |
0.0277 |
0.0302 |
| 4.750 |
±0.040 |
17.72 |
0.0265 |
±4% |
0.0198 |
±4% |
0.0248 |
±4% |
0.0271 |
±4% |
| 5.000 |
19.63 |
0.0239 |
0.0178 |
0.0224 |
0.0244 |
| 5.300 |
±0.050 |
22.06 |
0.0213 |
±4% |
0.0159 |
±4% |
0.0199 |
±4% |
0.0218 |
±4% |
| 5.600 |
24.63 |
0.0191 |
0.0142 |
0.0179 |
0.0195 |
| 6.000 |
±0.060 |
28.27 |
0.0166 |
±4% |
0.0124 |
±4% |
0.0156 |
±4% |
0.017 |
±4% |
| 6.300 |
31.17 |
0.0151 |
0.0112 |
0.0141 |
0.0154 |
Product Tags:
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6J40 Constantan Flat Wire Precision Wire For Electronics Manufacturing And Scientific Instrumentation Images
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