Richards Thermocouple and Temperature Sensor Catalog 16

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Type A (80% Nickel) Type C (60% Nickel) Gauges
Wire
Gauge Inches MM
Type A
Part Number
Ohms /
Foot
Feet /
Pound
Type C Part
Number
Ohms /
Foot
Feet / Pound
0 0.410 10.414 NWA910 0.003867 2.077 NWC910 0.004015 2.119
0 0.365 9.271 NWA920 0.004879 2.621 NWC920 0.005067 2.673
0 0.325 8.255 NWA930 0.006154 3.305 NWC930 0.006391 3.372
1 0.289 7.341 NWA010 0.007782 4.180 NWC010 0.008082 4.264
2 0.258 6.553 NWA020 0.009765 5.245 NWC020 0.01014 5.351
3 0.229 5.817 NWA030 0.01240 6.658 NWC030 0.01287 6.792
4 0.204 5.182 NWA040 0.01562 8.390 NWC040 0.01622 8.559
5 0.182 4.623 NWA050 0.01962 10.54 NWC050 0.02038 10.75
6 0.162 4.115 NWA060 0.02477 13.30 NWC060 0.02572 13.57
7 0.144 3.658 NWA070 0.03135 16.84 NWC070 0.03255 17.18
8 0.128 3.251 NWA080 0.03967 21.31 NWC080 0.04120 21.74
9 0.114 2.896 NWA090 0.05002 26.87 NWC090 0.05194 17.41
10 0.102 2.591 NWA100 0.06248 33.56 NWC100 0.06488 34.23
11 0.091 2.311 NWA110 0.07849 42.16 NWC110 0.08151 43.01
12 0.081 2.057 NWA120 0.09907 53.21 NWC120 0.1029 54.29
13 0.072 1.829 NWA130 0.01254 67.35 NWC130 0.1302 68.71
14 0.064 1.626 NWA140 0.01587 85.24 NWC140 0.1648 86.96
15 0.057 1.448 NWA150 0.2001 107.50 NWC150 0.2078 109.6
16 0.051 1.295 NWA160 0.2499 134.20 NWC160 0.2595 136.9
17 0.045 1.143 NWA170 0.3210 172.40 NWC170 0.3333 175.9
18 0.040 1.016 NWA180 0.4063 218.20 NWC180 0.4219 222.6
19 0.0360 0.9140 NWA190 0.5015 269.40 NWC190 0.5208 274.8
20 0.0320 0.8130 NWA200 0.6348 341.00 NWC200 0.6592 347.8
21 0.0285 0.7239 NWA210 0.8002 429.80 NWC210 0.831 438.5
22 0.0253 0.6426 NWA220 1.015 545.50 NWC220 1.055 556.4
23 0.0226 0.5740 NWA230 1.273 683.60 NWC230 1.322 697.3
24 0.0201 0.5105 NWA240 1.609 864.20 NWC240 1.671 881.6
25 0.0179 0.4547 NWA250 2.029 1090 NWC250 2.107 1112
26 0.0159 0.4039 NWA260 2.571 1381 NWC260 2.670 1409
27 0.0142 0.3607 NWA270 3.224 1731 NWC270 3.348 1766
28 0.0126 0.3200 NWA280 4.094 2199 NWC280 4.252 2243
29 0.0113 0.2870 NWA290 5.090 2734 NWC290 5.286 2289
30 0.0100 0.2540 NWA300 6.500 3491 NWC300 6.750 3562
31 0.0089 0.2261 NWA310 8.206 4408 NWC310 8.522 4497
32 0.0080 0.2032 NWA320 10.160 5455 NWC320 10.55 5565
33 0.0071 0.1803 NWA330 12.890 5626 NWC330 13.39 7065
34 0.0063 0.1600 NWA340 16.380 8797 NWC340 17.01 8974
35 0.0056 0.1422 NWA350 20.730 11130 NWC350 21.52 11360
36 0.0050 0.1270 NWA360 26.000 13970 NWC360 27.00 14250
37 0.0045 0.1143 NWA370 32.100 17240 NWC370 33.33 17590
38 0.0040 0.1016 NWA380 40.630 21820 NWC380 42.19 22260
39 0.0035 0.0889 NWA390 53.060 28500 NWC390 55.10 29080
40 0.00310 0.0787 NWA400 67.640 36330 NWC400 70.24 37060
41 0.00275 0.0699 NWA410 85.950 46170 NWC410 89.26 47100
42 0.00250 0.0635 NWA420 104.000 55860 NWC420 108.00 55990
43 0.00225 0.0672 NWA430 128.400 68970 NWC430 133.30 70350
44 0.00200 0.0508 NWA440 162.500 87280 NWC440 168.80 89040
45 0.00175 0.0445 NWA450 212.00 114000 NWC450 220.40 116300
46 0.00150 0.0381 NWA460 288.900 155200 NWC460 300.00 158300
The Richards NWA or Type A heater wire is composed of 80% Nickel and 20% Chromium. It has a lower temperature coefficient of re-
sistance when compared to Type C wire. Type A has a usable temperature range up to 1150°C or 2100°F. Our NWC or Type C is composed of 60%
Nickel, 16% Chromium, and 24% Iron. The Type C has a usable temperature range up to 1000°C or 1850°F. It has a higher coefficient of
resistance than the Type A. Both types have excellent corrosion resistance. The Type C wire is very useful in applications where a
high resistance is required within a limited space. In heating and technical applications, the Type A is most commonly used.
Heater Wire - Type A (80%) and Type C (60%)
Manufacturing, Engineering and Sales Since 1938
Phone: 617.527.4385 Fax: 617.964.3746 Email:
NWA
NWC
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