Leave Your Message
Explore our core range of flexible copper wire products, precision-engineered to deliver reliable conductivity and mechanical endurance in demanding carbon brush lead environments.
Soft Connection Conductive Tape Copper Flat Wire for Reliable Electrical Connections
Soft Copper Stranded Wire for Welding – Flexible Electrical Connections from China Suppliers & Factory
Soft Copper Wire – Flexible Stranded & Braided Copper Wire Factory for Electrical Connections
Customizable Tinned Copper Braided Flat Wire – High Flexibility and Solderability, Factory Direct
Bare stranded copper wire for carbon brush leads is a specialized conductor manufactured by twisting multiple fine copper strands together without any insulating coating. This construction delivers exceptional flexibility, superior electrical conductivity, and outstanding resistance to mechanical fatigue — all critical properties for carbon brush lead applications in rotating electrical machinery.
Carbon brushes serve as the sliding electrical contacts in motors, generators, alternators, slip ring assemblies, and traction systems. The lead wire — the flexible pigtail connecting the brush body to the circuit — must withstand continuous micro-vibration, thermal cycling, and current surges without fracturing. Bare stranded copper wire, with its multi-strand architecture, distributes mechanical stress across hundreds of individual filaments, dramatically extending service life compared to solid conductors.
Xingma's bare stranded copper wire for carbon brush leads is drawn from electrolytic tough-pitch (ETP) or oxygen-free copper (OFC) rod, ensuring purity levels of 99.9% or higher. The stranding process follows international standards such as IEC 60228 and ASTM B8, with strand counts ranging from 7 to over 1,000 filaments depending on the required cross-section and flexibility class.
Every strand is engineered to meet the rigorous demands of carbon brush lead environments, from industrial motors to high-speed rail traction systems.
Fine-strand architecture with individual wire diameters as small as 0.05 mm enables extreme bending radii, accommodating the constant micro-movements inherent in carbon brush assemblies without wire breakage.
Manufactured from ≥99.9% pure electrolytic copper, achieving conductivity of 100% IACS (International Annealed Copper Standard), ensuring maximum current transfer efficiency with minimal resistive heating.
Optimized annealing processes provide excellent resistance to thermal fatigue across operating temperatures from -40°C to +200°C, maintaining conductivity and flexibility throughout the service life.
Bare copper's natural oxide layer provides adequate short-term protection, while optional tinning treatments offer enhanced resistance to sulfidation and oxidation in harsh industrial environments.
Advanced wire drawing technology ensures tight diameter tolerances (±0.002 mm), consistent strand lay length, and uniform cross-sectional area — critical for predictable electrical and mechanical performance.
Bare copper strands exhibit excellent weldability for resistance welding, ultrasonic welding, and soldering processes used in carbon brush lead termination, ensuring low-resistance, mechanically robust joints.
From automotive alternators to wind turbine slip rings, our carbon brush lead wire serves critical roles across diverse industries worldwide.
Modern vehicles rely on alternators and starter motors fitted with carbon brushes riding on copper slip rings. The lead wire must survive engine bay temperatures exceeding 150°C, constant vibration from road surfaces, and millions of flex cycles over the vehicle's lifetime. Ultra-fine bare stranded copper wire (Class 6 or Class 7 per IEC 60228) with strand diameters of 0.05–0.10 mm is the industry-preferred choice, offering the necessary combination of flexibility and current capacity for 12V–48V mild hybrid architectures.
Wind turbines use carbon brush and slip ring assemblies to transmit power and control signals between the rotating nacelle and the stationary tower. The lead wires endure millions of rotational cycles, temperature swings from -40°C to +80°C, and exposure to moisture and salt air. High-strand-count bare copper wire — often with 600+ individual filaments — provides the fatigue resistance needed for 20+ year service intervals, reducing maintenance costs in remote offshore installations.
Electric locomotives, EMUs, and metro trains employ large carbon brush assemblies on traction motor commutators and pantograph current collectors. Lead wires carry currents exceeding 500A in some applications, requiring large cross-section bare stranded copper conductors with exceptional current density. The stranded construction also absorbs the shock loads transmitted through the brush holder during track irregularities, preventing premature wire fatigue fracture.
Rolling mills, hoists, cranes, paper machines, and mining equipment use large DC motors with multiple carbon brush sets. In these heavy-duty applications, bare stranded copper lead wires must handle high continuous currents, frequent starts and stops generating thermal cycling, and the physical abuse of industrial environments. Xingma's wire is manufactured to withstand these conditions with consistent performance across the full operating cycle.
Modern industrial robots, rotary indexing tables, and automated assembly systems use compact slip ring modules with miniature carbon brushes. The lead wires in these applications must be extremely fine (often below 0.1 mm strand diameter) to fit within tight space envelopes while delivering reliable signal and low-voltage power transmission. The bare copper surface ensures optimal contact resistance at the brush-ring interface.
Single and dual-axis solar trackers use motorized drives with carbon brush contacts to manage rotational power transmission. As utility-scale solar farms expand globally, the demand for reliable, long-life carbon brush lead wire grows correspondingly. Bare stranded copper wire's combination of high conductivity and flexibility makes it ideal for the continuous slow-rotation duty cycles characteristic of solar tracking applications.
The global market for bare stranded copper wire in carbon brush lead applications is evolving rapidly, shaped by electrification, automation, and sustainability imperatives.
The accelerating transition to electric and hybrid vehicles is reshaping demand for carbon brush lead wire. While brushless motor architectures reduce some traditional applications, traction motor generators, onboard chargers, and auxiliary systems in EVs still require high-quality carbon brush contacts with reliable lead wire connections. The global EV market, projected to reach 45 million units annually by 2030, represents a significant and growing demand segment.
Global wind power capacity is forecast to double by 2030, with offshore wind installations driving demand for high-reliability slip ring and carbon brush systems. Each multi-megawatt turbine requires multiple slip ring assemblies with precision carbon brush lead wires rated for 20+ year service life. The renewable energy sector is becoming one of the fastest-growing end markets for premium bare stranded copper wire.
The proliferation of industrial robots, collaborative robots (cobots), and automated guided vehicles (AGVs) is creating new demand for miniaturized, high-cycle-life carbon brush lead wires. These applications require ultra-fine stranded copper wire with strand counts exceeding 1,000 filaments, pushing wire drawing technology to new precision limits. China's manufacturing sector alone is projected to install over 1 million industrial robots annually by 2025.
| Parameter | Standard Grade | High-Flex Grade | Ultra-Fine Grade |
|---|---|---|---|
| Copper Purity | ≥99.9% ETP | ≥99.95% OFC | ≥99.97% OFC |
| Individual Strand Diameter | 0.10 – 0.30 mm | 0.05 – 0.10 mm | 0.02 – 0.05 mm |
| Strand Count | 7 – 49 | 49 – 630 | 630 – 1,500+ |
| Cross-Section Range | 0.5 – 16 mm² | 0.1 – 10 mm² | 0.05 – 4 mm² |
| Conductivity | ≥98% IACS | ≥100% IACS | ≥100% IACS |
| Tensile Strength (annealed) | 200 – 250 MPa | 180 – 220 MPa | 160 – 200 MPa |
| Elongation at Break | ≥25% | ≥30% | ≥35% |
| Temperature Range | -40°C to +150°C | -40°C to +180°C | -40°C to +200°C |
| Standards Compliance | IEC 60228, ASTM B8 | IEC 60228 Class 5/6 | IEC 60228 Class 6/7 |
| Surface Finish | Bright bare copper | Bright bare / tinned | Bright bare / tinned |
10,000+ m² manufacturing base in Liushi, China's electrical capital, with 300+ top-level machines ensuring consistent quality and competitive pricing.
Full customization of strand count, cross-section, lay length, surface treatment, and spool packaging to match your exact carbon brush lead specifications.
ISO 9001 quality management and ISO 14001 environmental certifications. Every batch tested for conductivity, tensile strength, and dimensional accuracy.
2,000+ tons annual capacity with streamlined export logistics. Reliable delivery to Europe, North America, Southeast Asia, and the Middle East.
Established in 2019 and headquartered in Liushi — the capital of electrical appliances in China — Zhejiang Xingma Copper Industry Co., Ltd. is a leading enterprise specializing in metal products, wire and cable processing, and international trade. The company revolves around modern enterprise mechanisms and mass-production mechanical automation.
Our leading products include copper wire, copper braided wire, copper stranded wire, soft copper stranded wire, brush wire, carbon brush wire, soft connection series products, metal stamping parts, and more — best-selling domestically and internationally, deeply trusted by customers worldwide.
The company abides by the Universal Declaration of Human Rights and major UN conventions, respects human and labor rights, and is committed to scientific and technological innovation as the foundation for sustained growth.
Zhejiang Xingma Copper Industry Co., Ltd. operates a factory with over 10,000 square meters of construction area and more than 100 skilled employees. Our production capabilities are underpinned by more than 300 domestic top-level manufacturing machines:
With an annual production capacity exceeding 2,000 tons, Xingma is fully equipped to fulfill large-volume orders for bare stranded copper wire for carbon brush leads with consistent quality and on-time delivery.
Browse our full portfolio of flexible copper wire and braided conductor products, all available with custom specifications for carbon brush lead and related electrical connection applications.
China Suppliers Factory Soft Connection Conductive Tape Copper Flat Wire for Reliable Electrical Connections
Soft Copper Stranded Wire for Welding – Flexible Electrical Connections from China Suppliers & Factory
Soft Copper Wire from China Suppliers – Flexible Stranded & Braided Copper Wire Factory for Electrical Connections
Customizable Tinned Copper Braided Flat Wire – High Flexibility and Solderability, Factory Direct
High Quality Copper Powder from China Suppliers | Reliable Copper Powder Factory for Various Industries
Custom Cut & Weld Solutions for Flexible Copper Strand Connectors
Flexible Copper Braided Flat Wire – High Conductivity, EMI Shielding & Customizable
Custom Rectangular Copper Braided Wires from China Suppliers | Factory Direct, 8/12 Spindles, Tailored Solutions
Tell us your strand count, cross-section, length, and surface finish requirements. Our engineering team will respond within 24 hours with a competitive quotation and technical datasheet.
Get a Free Quote Now