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.
Flexible Delivery and Technical Support – No MOQ, with fast stock availability and one-on-one engineering consultation to ensure smooth selection and installation.
TFL 6215/C4VL0241 is fully compatible with SKF and FAG 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 | NSK | NTN |
|---|---|---|---|---|
| 6215/C4VL0241 | 6215-J20AA-C4 | 6215-M-C4-SQ77 | 6215HDY2C3 | 7MC3-6215C3 |
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.
High Speed Rating – Precision geometry minimizes friction, perfect for modern VFD motors.
C4 Clearance – Absorbs shaft deflection caused by heavy vibrations in harsh machinery.
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 6215/C4VL0241 is an ideal component for the high-speed motors of turbo blowers used in wastewater treatment aeration, such as equipment from Howden or Aerzen. These blowers operate at very high RPMs and generate significant compression heat, which transfers to the motor shaft. The C4 clearance is mandatory here to provide sufficient internal space for thermal expansion, preventing the bearing from overheating and seizing. By leveraging China’s advanced supply chain for specialized clearance bearings, TFL can offer these high-speed insulated units with significantly shorter production lead times than European competitors, ensuring that critical municipal water treatment facilities can perform urgent maintenance without risking environmental compliance due to equipment downtime.
Designed for the fan motors inside textile stenters and drying ovens, such as those manufactured by Monforts or Brückner. In these applications, the entire bearing assembly operates in a high-temperature zone (often >100°C ambient). A standard C3 bearing would quickly fail due to the loss of internal clearance; the C4 clearance is specifically engineered to handle this thermal environment. Furthermore, as these fans are speed-controlled by inverters to optimize fabric drying processes, the VL0241 insulation acts as a critical reliability safeguard, preventing spark erosion damage caused by shaft voltages and ensuring continuous, defect-free fabric production.
This model is suitable for the electric motors driving boiler feed pumps in power plants or industrial steam systems, typified by KSB or Sulzer high-pressure pumps. These pumps transport hot water (often >120°C), creating a steep temperature gradient between the hot shaft and the cooler housing. The C4 clearance is essential to compensate for this differential expansion. Additionally, for modern power plants aiming to meet strict efficiency and safety regulations (such as ISO 50001 for Energy Management), VFDs are commonly used. TFL’s insulated bearing protects the motor from the resulting electrical stresses, ensuring compliance with reliability targets for critical power generation infrastructure.
*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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