Arklay S. Richards

The Arklay S. Richards Co., Inc. offers two types of resistance heating wire. The RICHARDS NWA or Type A heating wire is composed of 80% Nickel and 20% Chromium. It has a lower temperature coefficient of resistance when compared to Type C wire. The Type A has a usable temperature range up to 1150°C or 2100° F. Our NWC or Type C resistance heating wire is composed of 60% Nickel, 16% Chromium, and the balance Iron. The Type C has a usable temperature range up to 1000°C or 1850°F. It has a higher coefficient of resistance when compared to the Type A wire. 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. The Type A and Type C wire are both offered in large or small spool sizes.

Note: Chromium-Aluminum electrical resistance alloy wire is also available.

Resistance Wire-Type A & C

Type A is an 80/20 nickel-chromium wire. It has a low temperature coefficient of resistance.
Type C is a 60/16 nickel-chromium-iron wire used where heating elements capable of developing very high resistance within a limited space and top operating temperatures do not
exceed 1850° F.

Gauge	DIAMETER		Type A			Type C
Gauge	Inches	MM	Catalog No.	Ohms/Foot	Feet/ Pound	Catalog No.	Ohms/Foot	Feet/ Pound
000	0.410	10.414	NWA910	0.003867	2.077	NWC910	0.004015	2.119
00	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	27.41
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	0.1254	67.35	NWC130	0.1302	68.71
14	0.064	1.626	NWA140	0.1587	85.24	NWC140	0.1648	86.96
15	0.057	1.448	NWA150	0.2001	107.5	NWC150	0.2078	109.6
16	0.051	1.295	NWA160	0.2499	134.2	NWC160	0.2595	136.9
17	0.045	1.143	NWA170	0.3210	172.4	NWC170	0.3333	175.9
18	0.040	1.016	NWA180	0.4063	218.2	NWC180	0.4219	222.6
19	0.036	0.914	NWA190	0.5015	269.4	NWC190	0.5208	274.8
20	0.032	0.813	NWA200	0.6348	341.0	NWC200	0.6592	347.8
21	0.0285	0.7239	NWA210	0.8002	429.8	NWC210	0.831	438.5
22	0.0253	0.6426	NWA220	1.015	545.5	NWC220	1.055	556.4
23	0.0226	0.5740	NWA230	1.273	683.6	NWC230	1.322	697.3
24	0.0201	0.5105	NWA240	1.609	864.2	NWC240	1.671	881.6
25	0.0179	0.4547	NWA250	2.029	1090.0	NWC250	2.107	1112.0
26	0.0159	0.4039	NWA260	2.571	1381.0	NWC260	2.670	1409.0
27	0.0142	0.3607	NWA270	3.224	1731.0	NWC270	3.348	1766.0
28	0.0126	0.3200	NWA280	4.094	2199.0	NWC280	4.252	2243.0
29	0.0113	0.2870	NWA290	5.090	2734.0	NWC290	5.286	2789.0
30	0.0100	0.2540	NWA300	6.500	3491.0	NWC300	6.750	3562.0
31	0.0089	0.2261	NWA310	8.206	4408.0	NWC310	8.522	4497.0
32	0.0080	0.2032	NWA320	10.16	5455.0	NWC320	10.55	5565.0
33	0.0071	0.1803	NWA330	12.89	6926.0	NWC330	13.39	7065.0
34	0.0063	0.1600	NWA340	16.38	8797.0	NWC340	17.01	8974.0
35	0.0056	0.1422	NWA350	20.73	11130.0	NWC350	21.52	11360.0
36	0.0050	0.1270	NWA360	26.00	13970.0	NWC360	27.00	14250.0
37	0.0045	0.1143	NWA370	32.10	17240.0	NWC370	33.33	17590.0
38	0.0040	0.1016	NWA380	40.63	21820.0	NWC380	42.19	22260.0
39	0.0035	0.0889	NWA390	53.06	28500.0	NWC390	55.10	29080.0
40	0.0031	0.0787	NWA400	67.64	36330.0	NWC400	70.24	37060.0
41	0.00275	0.0699	NWA410	85.95	46170.0	NWC410	89.26	47100.0
42	0.00250	0.0635	NWA420	104.0	55860.0	NWC420	108.0	55990.0
43	0.00225	0.0672	NWA430	128.4	68970.0	NWC430	133.3	70350.0
44	0.00200	0.0508	NWA440	162.5	87280.0	NWC440	168.8	89040.0
45	0.00175	0.0445	NWA450	212.2	114000.0	NWC450	220.4	116300.0
46	0.00150	0.0381	NWA460	288.9	155200.0	NWC460	300.0	158300.0