Electrical Protection: Breakdown voltage up to 3000V. Blocks stray currents to prevent electrical corrosion.
Reliable Quality: Compliant with ISO 9001 and REACH standards. The production process is fully traceable.
Competitive Pricing: Efficient sourcing channels allow us to offer more competitive pricing than the market average.
Plasma Spray Technology: Creates a coating with excellent wear and heat resistance.
TFL 6228/C4VL0241 perfectly achieves direct replacement for equivalent insulated bearings from international brands like SKF and FAG in terms of dimensions (140x250x42mm), standard steel cage design, and C4 extra-large clearance standard. All delivered products pass 100% dielectric and dimensional precision testing, ensuring “plug-and-play” installation and reliable lifespan in high-heat VFD systems across paper and metallurgy industries.
| SKF | FAG | NTN |
|---|---|---|
| 6228/C4VL0241 | 6228-J20AB-C4 | 7MC3-6228C3 |
Focusing on the demand for high-end large-bore bearings combining a 140mm bore with C4 extra-large clearance and outer-ring insulation, TFL relies on a robust premium industrial transmission supply chain network and an ISO 9001 certified quality control system to seamlessly integrate imported temperature-controlled plasma spraying processes with precision large-bearing standards. We provide high-reliability anti-erosion products rivaling top global brands, backed by a professional engineering team for selection and diagnostic support. With rapid response and No MOQ, TFL is dedicated to helping global clients eliminate lead-time risks on large specialized parts, achieving significant cost optimization.
C4 Extra-Large Clearance — Absolutely critical for surviving extreme temperature gradients and massive heat transfer.
Standard Pressed Steel Cage — Lightweight and highly efficient, optimized for low running friction.
Optimal Insulation Resistance — Maintains 50–200 MΩ, efficiently eliminating VFD-induced raceway fluting.
TFL 6228/C4VL0241 is explicitly designed for industrial equipment facing “extreme heat coupled with strong VFD electrical discharge” but maintaining relatively smooth and steady running without severe shocks. Typical applications encompass high-temperature dryer main drive shafts in large paper machinery, main drives for metallurgical heating and continuous annealing lines, high-temperature centrifugal exhaust fans in chemical plants, and high-temp thermal circulation pumps. Its C4 extra-large clearance guarantees mechanical running margins under extreme temperature gradients, the steel cage provides excellent low wear and high energy efficiency, and the outer-ring ceramic insulation ensures high dielectric isolation within standard housing seats to protect raceways.
In the dryer sections of large paper machines by Valmet and Voith, drive motors operate year-round in extremely high-temperature steam environments. Large bearings with standard C3 clearance are highly prone to seizure as thermal expansion depletes the internal clearance. TFL 6228/C4VL0241’s C4 extra-large clearance perfectly absorbs intense thermal stress conducted through the shaft. Concurrently, its 3000V outer-ring insulation entirely resolves inverter-induced electrical erosion, making it a standard solution to prevent bearing seizure and box burnouts in high-heat zones of paper mills.
High-power VFD motors by ABB or Siemens used on steel continuous annealing and heat treatment lines are subjected to long-term high-temperature radiation at the shaft ends. Relying on its robust 140mm radial support, coupled with the anti-seizure C4 clearance design and insulated outer ring, TFL 6228/C4VL0241 completely eliminates "micro-arcing" erosion of the bearing raceways by parasitic currents. Meanwhile, the steel cage provides minimal running resistance at steady high speeds, ensuring continuous, safe production for critical metallurgical equipment under thermodynamically extreme conditions.
In high-temperature exhaust centrifugal fans by Howden used in metallurgy and large chemical plants, massive amounts of exhaust heat conduct directly from the impeller to the non-drive end bearing position, accompanied by VFD harmonic interference. Paired with TFL 6228/C4VL0241, its C4 clearance prevents bearing seizure caused by rapid temperature changes, the steel cage provides minimal resistance at steady high speeds, and the outer-ring ceramic insulation coating blocks high-frequency shaft voltages, drastically improving the fan’s uptime.
*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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