How does FISSOT® CCS wire contribute to global sustainability (ESG)?

CCS is an excellent resource-saving material. By cladding a thin copper layer onto a steel core, we reduce pure copper consumption by approximately 60%-80% without sacrificing electrical performance. Furthermore, the high durability of CCS extends the service life of cables, reducing industrial waste.

A spool of FISSOT copper clad steel wire against a white background.

A large spool of copper-clad steel wire being processed on industrial machinery.

A large spool of copper-clad aluminum wire wrapped in protective plastic film in a warehouse.

Copper Clad Steel (CCS) Wire

FISSOT® CCS Wire is a high-strength bimetallic conductor that fuses the superior conductivity of copper with the rugged durability of steel. By utilizing advanced Cold Cladding Technology, we create a permanent metallurgical bond that excels in mechanical stress environments. It is the premier choice for grounding, automotive lightweighting, and high-reliability telecommunications.

🌟 Key Benefits

🔗 Ultra-Low Breakage Rate: Ensures excellent continuity and stability during wire harness production, significantly minimizing manufacturing downtime.
💪 Unmatched Strength: Available in Low Carbon, High Strength, and Extra High Strength grades.
🚗 Automotive Lightweighting: Enables wire gauge reduction (e.g., 0.35mm² to 0.13mm²) without sacrificing durability.
📡 Signal Integrity: Leverages the "Skin Effect" for efficient RF shielding and high-frequency data transmission.

🚀 Top Applications

- ⚡ Grounding: Utility grounding wire and lightning protection systems.
- 🚗 Automotive: ABS brake lines, sensor cables, and high-stress wire harnesses.
- 🛰️ Aerospace: Lightweight, high-reliability wiring for aircraft and satellites.

📶 Telecom: RF coaxial cable inner conductors and drop wires.

Contact Us for Pricing

Interested in this product? Contact us now for detailed pricing and product information.

2026 Engineering: Precision & Performance Breakthrough

At FISSOT, we are continuously pushing the boundaries of bimetallic material science. Our 2026 technical roadmap introduces four major upgrades to our Copper Clad Steel (CCS) wire portfolio to meet the evolving demands of high-frequency transmission and automotive lightweighting:

Ultra-Fine Precision (0.03mm)

Mass production achieved down to 0.03mm. Fully compliant with T/SOECC standards, optimized for micro-coaxial cables and medical electronics.

Enhanced Automotive Ductility

Recalibrated tensile strength (400–600 MPa) and superior elongation (≥30%) to eliminate wire breakage in high-vibration harnesses.

Validated High-Strength

Optimized to a verified threshold of ≥2000 MPa, ensuring maximum mechanical tension for utility messenger wires without bond failure.

60% IACS Conductivity

New high-conductivity grades reaching ≥60% IACS, allowing for efficient copper replacement in high-current industrial applications.

Grade Classification	Diameter Range	Tensile Strength (MPa)	Elongation (%)	Conductivity (IACS)
Ultra-Fine CCS	0.03mm – 0.12mm	400 – 550	≥ 15%	21% – 40%
Flexible CCS	0.13mm – 0.50mm	400 – 600	≥ 30%	21% – 40%
High-Strength CCS	0.10mm – 2.00mm	≥ 2000	≥ 1.5%	21% – 30%
High-Conductivity	0.08mm – 1.20mm	450 – 650	≥ 20%	≥ 60%

AWG	Diameter		Sectional Area		Nom. Cu Thick.		Hard Drawn Breaking Strength			Annealed Breaking Strength			Weight (Ref)		Max DC Res. (20°C)
AWG	in	mm	in²	mm²	in	mm	Ibf	kgf	Mpa	Ibf	kgf	Mpa	lb/k-ft	kg/km	Ω/k-ft	Ω/km
4	0.2043	5.189	0.03278	21.15	0.00306	0.1557	3148.2	1428	662	1502.7	682	316	112.92	168	0.360	1.183
5	0.1819	4.621	0.02597	16.77	0.00273	0.1386	2621.3	1189	695	1192.3	541	316	89.39	133	0.455	1.494
6	0.162	4.115	0.02060	13.29	0.00243	0.1235	2160.5	980	723	944.8	428	316	71.25	106	0.573	1.881
7	0.1443	3.664	0.01635	10.54	0.00216	0.1099	1776.9	806	750	749.1	340	316	56.46	84	0.723	2.372
8	0.1285	3.195	0.01296	8.01	0.00193	0.0959	1446.2	656	802	593.9	270	329	45.03	67	0.912	2.991
9	0.1144	2.906	0.01027	6.63	0.00172	0.0872	1197.1	543	803	472.4	214	317	35.62	53	1.150	3.774
10	0.1019	2.588	0.00815	5.26	0.00153	0.0776	1005.3	456	850	373.4	169	316	28.23	42	1.450	4.759
11	0.0907	2.305	0.00646	4.17	0.00136	0.0692	826.7	375	881	296.9	135	316	22.18	33	1.830	6.003
12	0.0808	2.053	0.00512	3.31	0.00121	0.0616	577.6	262	776	236.2	107	317	17.48	26	2.307	7.570
13	0.072	1.828	0.00407	2.62	0.00108	0.0548	476.2	216	807	186.7	85	316	14.11	21	2.901	9.515
14	0.0641	1.628	0.00323	2.08	0.00096	0.0488	399.0	181	853	148.5	67	317	11.43	17	3.667	11.994
15	0.0571	1.45	0.00256	1.65	0.00086	0.0435	306.4	139	825	117.0	53	315	8.74	13	4.620	15.159
16	0.0508	1.291	0.00203	1.31	0.00076	0.0387	251.3	114	854	92.2	42	313	6.72	10	5.837	19.152
17	0.0453	1.15	0.00161	1.04	0.00068	0.0345	205.0	93	878	74.2	34	318	5.56	8.27	7.350	24.098
18	0.0403	1.024	0.00127	0.82	0.00060	0.0307	172.0	78	929	58.5	27	316	4.37	6.5	9.336	30.631
19	0.0359	0.912	0.00101	0.65	0.00054	0.0274	130.1	59	886	47.2	21	322	3.48	5.18	11.730	38.485
20	0.032	0.812	0.00080	0.52	0.00048	0.0244	108.0	49	928	36.0	16	309	2.76	4.1	14.805	48.573
21	0.0285	0.723	0.00064	0.41	0.00043	0.0217	86.0	39	931	29.2	13	317	2.18	3.24	18.738	61.476
22	0.0253	0.644	0.00050	0.33	0.00038	0.0193	68.3	31	933	22.5	10	307	1.72	2.56	23.716	77.808
23	0.0226	0.573	0.00040	0.26	0.00034	0.0172	52.9	24	913	18.2	8	314	1.36	2.03	29.900	98.092
24	0.0201	0.511	0.00032	0.20	0.00030	0.0153	44.1	20	956	14.6	7	317	1.10	1.63	37.346	122.527

AWG	Diameter		Sectional Area		Nom. Cu Thick.		Hard Drawn Breaking Strength			Annealed Breaking Strength			Weight (Ref)		Max DC Res. (20°C)
AWG	in	mm	in²	mm²	in	mm	Ibf	kgf	Mpa	Ibf	kgf	Mpa	lb/k-ft	kg/km	Ω/k-ft	Ω/km
4	0.2043	5.189	0.03278	21.15	0.00306	0.3632	2672.0	1212	562	1430.8	649	301	115.81	172.3	0.252	0.828
5	0.1819	4.621	0.02597	16.77	0.00273	0.3234	2217.8	1006	588	1135.4	515	301	91.81	136.6	0.318	1.045
6	0.162	4.115	0.0206	13.29	0.00243	0.2880	1840.8	835	616	899.5	408	301	72.86	108.4	0.402	1.318
7	0.1443	3.664	0.0163	10.54	0.00216	0.2566	1538.8	698	649	714.3	324	301	57.79	85.98	0.506	1.661
8	0.1285	3.195	0.0130	8.01	0.00193	0.2285	1258.8	571	698	566.6	257	314	45.83	68.18	0.638	2.094
9	0.1144	2.906	0.0103	6.63	0.00172	0.2034	1027.3	466	689	449.7	204	302	36.32	54.04	0.805	2.642
10	0.1019	2.588	0.0082	5.26	0.00153	0.1812	846.6	384	716	357.1	162	302	28.82	42.88	1.015	3.329
11	0.0907	2.305	0.0065	4.17	0.00136	0.1613	687.8	312	733	284.4	129	303	22.83	33.97	1.281	4.204
12	0.0808	2.053	0.0051	3.31	0.00121	0.1437	564.4	256	758	227.1	103	305	18.12	26.96	1.614	5.296
13	0.072	1.828	0.0041	2.62	0.00108	0.1280	407.9	185	691	178.6	81	303	14.39	21.41	2.033	6.671
14	0.0641	1.628	0.0032	2.08	0.00096	0.1140	313.1	142	669	143.3	65	306	11.41	16.97	2.565	8.415
15	0.0571	1.45	0.0026	1.65	0.00086	0.1015	255.7	116	689	112.4	51	303	9.05	13.46	3.233	10.607
16	0.0508	1.291	0.0020	1.31	0.00076	0.0903	209.4	95	712	90.4	41	307	7.16	10.66	4.084	13.399
17	0.0453	1.15	0.0016	1.04	0.00068	0.0805	172.0	78	736	70.5	32	302	5.69	8.47	5.136	16.851
18	0.0403	1.024	0.0013	0.82	0.00060	0.0717	141.1	64	762	57.3	26	310	4.51	6.71	6.490	21.293
19	0.0359	0.912	0.0010	0.65	0.00054	0.0638	108.0	49	735	44.1	20	300	3.58	5.32	8.177	26.829
20	0.032	0.812	0.0008	0.52	0.00048	0.0569	88.2	40	757	35.3	16	303	2.84	4.23	10.297	33.781
21	0.0285	0.723	0.0006	0.41	0.00043	0.0507	70.5	32	764	28.7	13	310	2.25	3.35	12.973	42.561
22	0.0253	0.644	0.0005	0.33	0.00038	0.0450	55.1	25	753	22.0	10	301	1.78	2.64	16.467	54.024
23	0.0226	0.573	0.0004	0.26	0.00034	0.0402	46.3	21	798	17.6	8	304	1.42	2.11	20.639	67.713
24	0.0201	0.511	0.0003	0.20	0.00030	0.0357	37.5	17	813	13.2	6	287	1.12	1.67	26.084	85.579

AWG	Diameter		Sectional Area		Nom. Cu Thick.		Hard Drawn Breaking Strength			Annealed Breaking Strength			Weight (Ref)		Max DC Res. (20°C)
AWG	in	mm	in²	mm²	in	mm	Ibf	kgf	Mpa	Ibf	kgf	Mpa	lb/k-ft	kg/km	Ω/k-ft	Ω/km
4	0.2043	5.189	0.03278	21.15	0.00306	0.5189	2572.8	1167	541	1311.7	595	276	117.09	174.2	0.189	0.621
5	0.1819	4.621	0.02597	16.77	0.00273	0.4620	2105.4	955	558	1038.4	471	275	92.82	138.1	0.239	0.784
6	0.162	4.115	0.0206	13.29	0.00243	0.4115	1710.8	776	572	824.5	374	276	73.60	109.5	0.301	0.988
7	0.1443	3.664	0.0163	10.54	0.00216	0.3665	1415.4	642	597	654.8	297	276	58.40	86.89	0.380	1.245
8	0.1285	3.195	0.0130	8.01	0.00193	0.3264	1148.6	521	637	518.1	235	287	46.31	68.9	0.479	1.571
9	0.1144	2.906	0.0103	6.63	0.00172	0.2906	932.5	423	625	410.1	186	275	36.71	54.61	0.604	1.982
10	0.1019	2.588	0.0082	5.26	0.00153	0.2588	767.2	348	649	326.3	148	276	29.12	43.33	0.761	2.498
11	0.0907	2.305	0.0065	4.17	0.00136	0.2304	634.9	288	677	257.9	117	275	23.07	34.33	0.961	3.152
12	0.0808	2.053	0.0051	3.31	0.00121	0.2052	533.5	242	717	205.0	93	275	18.31	27.24	1.211	3.973
13	0.072	1.828	0.0041	2.62	0.00108	0.1829	370.4	168	628	163.1	74	276	14.54	21.63	1.525	5.003
14	0.0641	1.628	0.0032	2.08	0.00096	0.1628	304.2	138	650	130.1	59	278	11.52	17.14	1.924	6.311
15	0.0571	1.45	0.0026	1.65	0.00086	0.1450	231.5	105	623	101.4	46	273	9.14	13.6	2.424	7.954
16	0.0508	1.291	0.0020	1.31	0.00076	0.1290	191.8	87	652	81.6	37	277	7.24	10.77	3.062	10.049
17	0.0453	1.15	0.0016	1.04	0.00068	0.1151	156.5	71	670	63.9	29	274	5.76	8.56	3.852	12.637
18	0.0403	1.024	0.0013	0.82	0.00060	0.1024	132.3	60	714	50.7	23	274	4.56	6.78	4.868	15.970
19	0.0359	0.912	0.0010	0.65	0.00054	0.0912	99.2	45	675	39.7	18	270	3.61	5.38	6.133	20.122
20	0.032	0.812	0.0008	0.52	0.00048	0.0813	83.8	38	719	33.1	15	284	2.87	4.273	7.720	25.326
21	0.0285	0.723	0.0006	0.41	0.00043	0.0724	66.1	30	716	26.5	12	287	2.28	3.39	9.730	31.921
22	0.0253	0.644	0.0005	0.33	0.00038	0.0643	52.9	24	722	20.1	9	274	1.80	2.671	12.350	40.518
23	0.0226	0.573	0.0004	0.26	0.00034	0.0574	41.9	19	722	16.8	8	289	1.43	2.131	15.472	50.762
24	0.0201	0.511	0.0003	0.20	0.00030	0.0511	35.3	16	765	13.2	6	287	1.13	1.686	19.561	64.177

Reduce Costs Without Sacrificing Performance

Switching from solid copper to FISSOT® CCS can reduce your material costs by up to 40%.

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FAQs About Copper-Clad Steel Conductor

What are the primary performance advantages of Copper Clad Steel (CCS) over pure copper wire in automotive wiring harnesses?

The main advantages of CCS lie in its superior tensile strength and flexibility life. Compared to pure copper, FISSOT’s CCS wire can withstand higher mechanical stress, enabling wire gauge reduction (e.g., from 0.35mm² to 0.13mm²) for automotive lightweighting. Additionally, CCS leverages the Skin Effect for high-frequency signal transmission, significantly reducing material costs while maintaining signal integrity.

What is the conductivity (IACS) range of FISSOT’s CCS wire, and does it comply with international standards?

We offer a wide range of conductivity options, typically from 21% IACS to 40% IACS, with customized higher grades available. As a drafting unit of the ISO 14811:2025 international standard, FISSOT® ensures that all CCS products strictly comply with automotive-grade standards such as ISO 6722 and SAE J1127, guaranteeing stable performance under various electrical loads.

How does CCS wire address the issue of galvanic corrosion between dissimilar metals?

FISSOT® utilizes advanced Cold Cladding Technology to create a robust metallurgical bond between the copper layer and the steel core. This interface is seamless, preventing oxygen molecules from entering and thus eliminating internal corrosion at the root. The outer copper layer serves as a physical barrier, providing the same environmental corrosion resistance as pure copper. For extreme environments, we recommend specific crimping techniques to ensure long-term terminal stability.

Is CCS wire compatible with traditional welding or crimping processes?

Yes, CCS wire is fully compatible with existing automated crimp machines and ultrasonic welding equipment. Due to the mechanical support provided by the steel core, crimped joints exhibit higher pull-out force. For fine wire diameters, we provide hardness-adjusted solutions to optimize the efficiency of wire stripping and terminal connection.

Does FISSOT® provide ultra-fine CCS wire for high-frequency applications?

Yes. We manufacture ultra-fine CCS wire with diameters as low as 0.03mm, which meets the T/SOECC standard lower limit. This is specifically engineered for high-frequency signal transmission in micro-coaxial cables and medical electronics.

What is the mechanical performance of FISSOT’s flexible CCS wire?

Our flexible CCS wire is designed for high-vibration environments like automotive harnesses. It offers a balanced tensile strength of 400–600 MPa and a superior elongation rate of ≥30%, providing significantly better fatigue resistance than traditional hard-drawn conductors.