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6J40 Constantan Flat Wire Precision Wire For Electronics Manufacturing And Scientific Instrumentation

6J40 Constantan Flat Wire Precision Wire For Electronics Manufacturing And Scientific Instrumentation

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.

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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.

Chemical composition

Name	Code	Main Composition(%)				Density
Name	Code	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)
Dia.(mm)			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	±0.040	19.63	0.0239	±4%	0.0178	±4%	0.0224	±4%	0.0244	±4%
5.300	±0.050	22.06	0.0213	±4%	0.0159	±4%	0.0199	±4%	0.0218	±4%
5.600	±0.050	24.63	0.0191	±4%	0.0142	±4%	0.0179	±4%	0.0195	±4%
6.000	±0.060	28.27	0.0166	±4%	0.0124	±4%	0.0156	±4%	0.017	±4%
6.300	±0.060	31.17	0.0151	±4%	0.0112	±4%	0.0141	±4%	0.0154	±4%

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