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/FAG/NKE/NTN/NSK equivalents for seamless interchange, delivering equal reliability at a lower cost.
Competitive Pricing: Factory-direct sales allow us to offer prices below the market average.
TFL 6312M/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 |
|---|---|---|---|---|
| 6312M/C4VL0241 | 6312-M-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.
Outer-ring insulation (VL0241) — same dimensions as standard bearing, direct replacement.
Breakdown voltage (DC) — 1000–3000 V; electrical resistance 50–200 MΩ.
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 6312M/C4VL0241 bearings are critical components for traction motors used in light rail, tramways, and metro systems.The C4 internal clearance is essential in these applications to compensate for the significant thermal expansion of the motor shaft during heavy load cycles and rapid acceleration.The machined brass cage (M) provides the necessary robustness to withstand high vibrations and shocks typical in railway bogies, while TFL’s VL0241 insulation protects the bearing from stray currents generated by the traction inverter, offering a reliable replacement for SKF INSOCOAT in railway maintenance.
These bearings are specifically engineered for VFD-driven auxiliary motors in steel production lines, such as roller table motors or fume extraction fans operating in high-temperature zones.In steel mills, ambient temperatures are extreme; a standard C3 clearance might disappear due to thermal expansion, leading to seizure. The C4 clearance ensures smooth operation even when the bearing inner ring becomes very hot.
Combined with TFL's electrical insulation to block inverter-induced currents, this model prevents the dual threats of thermal seizing and electrical fluting.
TFL 6312M/C4VL0241 serves as an excellent solution for the non-drive end (NDE) of generators in wind turbines, particularly in DFIG (Doubly Fed Induction Generator) systems.Wind generators experience rapid load changes and electrical switching frequencies that create dangerous shaft voltages. The C4 clearance allows for the temperature gradient between the hot generator rotor and the cooler housing.
By using TFL’s insulated bearings, operators can prevent the breakdown of the lubricant film caused by electric arcing, significantly reducing the need for uptower maintenance and offering full interchangeability with major OEM specified bearings.
*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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