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.
Plasma Spray Technology: Creates a coating with excellent wear and heat resistance.
Reliable Quality: Compliant with ISO 9001 and REACH standards. The production process is fully traceable.
TFL 6224M/C4VL2071 perfectly achieves direct replacement for equivalent inner-ring insulated bearings from international brands like SKF and FAG in terms of dimensions (120x215x40mm), brass cage design, C4 clearance, and VL2071 parameters. All delivered products pass strict dielectric and dimensional precision testing, ensuring “plug-and-play” installation in complex, high-heat, and high-vibration VFD systems.
| SKF | FAG |
|---|---|
|
6224M/C4VL2071
|
6224-N1-M-J20C-C3
|
Manufacturing a specialty insulated bearing that simultaneously requires a “120mm large bore, brass cage, C4 extra-large clearance, and bore ceramic coating” poses extreme challenges to supply chain process integration (controlling coating uniformity in the bore is far more difficult than on the outer ring). Relying on a robust premium industrial transmission supply chain network and an ISO 9001 certified quality control system, TFL seamlessly applies advanced imported temperature-controlled plasma spraying processes to heavy machinery standards. We provide high-performance anti-erosion products rivaling top global brands, backed by a professional engineering team for technical selection support. With rapid-response stock capabilities and No MOQ services, TFL is dedicated to helping global industrial clients eliminate lead-time risks on specialized parts, achieving significant cost savings.
Inner-Ring Insulation (VL2071) — High-bond alumina coating on the bore and side faces to block shaft currents.
C4 Extra-Large Clearance — Absolutely critical for extreme temperature gradients and massive heat transfer.
High Dielectric Strength — Guaranteed breakdown voltage up to 3000 V DC; resistance > 50 MΩ.
TFL 6224M/C4VL2071 inner-ring insulated bearings are exclusively designed for VFD equipment facing extreme temperatures and heavy vibrations where “the outer ring must be directly grounded or requires a tight housing interference fit.” Typical applications encompass AC traction motors in rail transit, high-temp exhaust dust fans in metallurgy, multi-stage centrifugal compressors in chemical plants, and specifically designed paper dryer drives. When outer-ring insulation cannot meet electrical or mechanical assembly demands, this model serves as the critical defense line preventing rotor leakage currents from destroying the equipment.
In AC traction systems for heavy-haul locomotives and high-speed trains by Alstom or Bombardier, to meet strict electromagnetic compatibility (EMC) and structural strength requirements, the bearing’s outer ring must often maintain direct, conductive contact with the metal housing for grounding. Standard outer-ring insulated bearings cannot be used here. TFL 6224M/C4VL2071 utilizes its VL2071 bore coating to intercept high-frequency common-mode leakage currents directly at the rotor source. Its brass cage flawlessly resists heavy track impacts, and the C4 clearance adapts to the motor’s high heat generation, making it an irreplaceable solution for locomotive overhauls.
In large centrifugal dust fans by Howden or Siemens used in steel plants, extreme exhaust heat conducts along the shaft. To rapidly dissipate this heat, housings often feature water-cooling jackets or require extremely tight interference fits on the outer ring. Spraying ceramic on the outer ring would impede heat transfer and risk coating damage during tight assembly. TFL 6224M/C4VL2071 uses inner-bore insulation to completely bypass housing assembly limits, successfully blocking parasitic shaft currents from VFD speed control. Paired with C4 clearance to resolve dangerous differential thermal expansion, it ensures efficient exhaust system operation.
In chemical plants or large air separation units, high-power VFD-driven centrifugal compressors by Atlas Copco or Ingersoll Rand often use split-housing designs requiring the outer ring to fit flawlessly to ensure micron-level concentricity. The tolerance of an outer-ring ceramic coating is often prohibited. TFL 6224M/C4VL2071 resolves this mechanical assembly contradiction with its inner-ring insulation. Without altering the original precision housing assembly processes, it thoroughly isolates high-frequency VFD currents right at the rotor shaft, protecting the expensive compressor from electrical erosion.
*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.
Discover more related products for your needs. Check out our hot-selling bearing models that serve as trusted alternatives to major brands like SKF and FAG—offering the same performance with greater value.
"*" indicates required fields
"*" indicates required fields
"*" indicates required fields
