Excellent Electrical Insulation – The outer ring features a plasma-sprayed aluminum oxide coating (100–500 μm thick) with dielectric strength up to 3000V, blocking shaft currents to prevent electrical erosion and lubricant degradation.
Brass Cage & High-Speed Capability – Solid brass cage (M) supports reference speeds up to 10000 r/min with precision grinding, ensuring low vibration under high temperatures and loads for VFD applications.
Reliable Quality – Compliant with ISO 9001 and REACH standards. The production process is fully traceable.
Competitive Pricing – Factory-direct sales allow us to offer prices below the market average.
TFL 6214M/C4VL0241 is fully compatible with SKF/FAG/NKE/NTN equivalents in dimensions, clearance, and insulation performance, allowing direct replacement without equipment modifications. Each bearing undergoes rigorous dielectric testing and dimensional checks, offering equivalent reliability while reducing total ownership costs. Opting for TFL provides ISO-certified quality and flexible supply chain support.
| SKF | FAG | NKE | NTN |
|---|---|---|---|
| 6214M/C4VL0241 | 6214-M-J20AA-C4 | 6214-M-C4-SQ77 | 7MC3-6214C3 |
TFL specializes in the development and manufacturing of electrically insulated bearings, using advanced plasma-spraying technology to ensure a uniform aluminum oxide coating for long-term stable insulation. Certified under ISO 9001:2015, we offer flexible delivery with no MOQ and provide end-to-end services from design to technical support. Choosing TFL means accessing cost-effective products that reduce maintenance costs and downtime risks.
Breakdown voltage (DC) — 1000–3000 V; electrical resistance 50–200 MΩ.
High reference speed — up to 10000 r/min.
Brass cage with C4 clearance — for enhanced radial play and reliability.
TFL insulated bearings are widely used in VFD motors, generators, pumps, fans, and wind turbine systems. The insulation coating blocks shaft current paths to minimize electrical erosion, making them ideal for high-voltage and variable-speed operations. Our bearings ensure stable performance in humid and vibratory conditions, extending overall system life.
TFL 6214M/C4VL0241 is specifically engineered for the traction motors of light rail vehicles and trams, such as those operating on CRRC or Alstom Citadis platforms. In these applications, the motor RPM is relatively high, making the lighter 62-series design preferable to reduce rotational mass, while the Machined Brass Cage (M) is absolutely necessary to withstand the continuous shocks and vibrations from the track. The C4 clearance compensates for the rapid heat buildup in the rotor during frequent stop-and-go cycles. By utilizing the agility of China’s mature industrial supply chain, TFL can offer customized brass-cage bearing production with lead times significantly shorter than European OEMs, allowing railway operators to secure “Drop-in” replacements quickly and maintain high fleet availability.
This bearing is ideal for VFD-driven high-speed process blowers used in metallurgy or chemical plants, such as equipment from Howden or TLT-Turbo. These blowers often handle hot gases, transmitting heat along the shaft to the bearing, which necessitates the C4 clearance to prevent thermal seizing. The Brass Cage ensures stability at high speeds where steel cages might deform. Furthermore, the VL0241 insulation serves as a critical safety barrier in hazardous environments; by preventing sparks generated by inverter-induced shaft voltages, it helps facility operators strictly comply with ATEX or equivalent explosion-proof safety regulations, ensuring safe operation in zones with combustible dust or gases.
Designed for the motors of vertical in-line pumps handling hot, aggressive chemicals. The vertical mounting position places significant gravity loads on the bearing cage; the Machined Brass Cage offers superior strength and friction properties compared to pressed steel, preventing cage wear and failure. Combined with C4 clearance to handle fluid temperatures often exceeding 150°C, and electrical insulation to block VFD currents, this TFL model provides a robust solution that extends the Mean Time Between Failures (MTBF) for critical pump assets in continuous-process chemical plants.
*The brands and series mentioned are provided for industry illustration only. Final bearing selection should be confirmed through verification of dimensions, clearance class, insulation type, and operating conditions. For selection assistance or technical consultation, please contact the TFL engineering team for support.
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