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.
Precision Design and High-Speed Capability – With a reference speed of 11000 r/min and precision grinding, it ensures low vibration and noise, ideal for high-speed VFD applications.
Full Compatibility and Direct Replacement – Matching dimensions of SKF and FAG equivalents for seamless interchange, delivering equal reliability at a lower cost.
Flexible Delivery and Technical Support – No MOQ, with fast stock availability and one-on-one engineering consultation to ensure smooth selection and installation.
TFL 6312/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 |
|---|---|---|---|---|
| 6312/C4VL0241 | 6312-J20AA-C4 | 6312-M-C4-SQ77 | 6312HDY2C3 | 2TS2-7MC2-6312M8C4 |
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 reference speed — up to 11000 r/min.
Breakdown voltage (DC) — 1000–3000 V; electrical resistance 50–200 MΩ.
Sheet metal 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 electrically insulated deep groove ball bearings (e.g., 6312/C4VL0241 and 6312/C3VL0241) are suitable for Siemens 1LE0001 and ABB M3BP series VFD-driven motors.
In these systems, induced shaft currents often cause fluting damage and lubricant degradation.
TFL’s aluminum oxide coating withstands 1000–3000 V and maintains standard interchangeability, making it a recommended alternative to SKF INSOCOAT and FAG J20AA types.
TFL electrically insulated bearings (e.g., 6312/C4VL0241) are recommended for Grundfos CR multistage pumps, KSB Eta centrifugal pumps, and Siemens industrial fans.
Operating in humid, high-vibration environments under VFD control, these systems are prone to electrical interference causing bearing failure.
TFL’s outer-ring insulation ensures long-term dielectric reliability and corrosion resistance in such conditions.
In the wind power sector, TFL electrically insulated bearings (e.g., 6312/C4VL0241 and 6312M/C4VL0241) can be applied in Goldwind GW121/2500, Goldwind GW series, and Vestas V90 turbine systems. These units operate under variable load, humidity, and vibration; bearings are susceptible to current erosion affecting lifespan. TFL’s plasma-sprayed ceramic coating withstands up to 3000 V and resists corrosion, making it a recommended solution for OEM and service applications.
*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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