Electrical Protection: Breakdown voltage up to 3000V. Blocks stray currents to prevent electrical corrosion.
Flexible MOQ: Low Minimum Order Quantity (MOQ). Supports both small-batch and large-volume orders.
Competitive Pricing: Factory-direct sales allow us to offer prices below the market average.
Variety of Types: Both C3/C4 and brass retainers, stamped steel retainers, are available for selection.
TFL 6324/C4VL2071 perfectly achieves direct replacement for equivalent inner-ring insulated bearings from international brands like SKF and FAG in terms of dimensions (120x260x55mm), standard heavy-duty steel cage, C4 extra-large clearance, and VL2071 parameters. All delivered products pass strict dielectric and dimensional precision testing, ensuring safe and reliable “plug-and-play” installation in extremely hot, heavy-load, and complex systems with restricted housing assemblies.
| SKF | FAG |
|---|---|
|
6324/C4VL2071
|
6324-J20C-C4
|
Procuring an insulated bearing that combines a “120mm heavy-duty cross-section, C4 extra-large clearance, and highly difficult bore ceramic coating” often means long lead times and high costs for global industrial buyers. Relying on a robust premium industrial transmission supply chain network and a strict ISO 9001 certified quality control system, TFL seamlessly integrates internationally advanced temperature-controlled plasma spraying processes into heavy machinery standards. We provide high-reliability anti-erosion products rivaling top global brands, backed by a professional engineering team for technical selection and diagnostic support. With rapid-response delivery and No MOQ services, TFL is dedicated to helping clients eliminate lead-time risks on specialized heavy parts, achieving significant cost optimization.
Inner-Ring Insulation (VL2071) — High-bond alumina coating on the bore and side faces to intercept shaft currents.
C4 Extra-Large Clearance — Absolutely critical for surviving extreme temperature gradients and massive heat transfer.
High Dielectric Strength — Consistently guarantees breakdown voltage up to 3000 V DC.
TFL 6324/C4VL2071 inner-ring insulated bearings are exclusively designed for industrial purgatory environments featuring “strict prohibitions on outer-housing coating interference” alongside massive temperature differentials and heavy VFD leakage currents. Typical applications encompass high-temp paper machine drives requiring absolute stator grounding, metallurgy high-temp exhaust fans with ultra-tight water-cooling jackets, and large high-temp gas compressors using split housings. When traditional outer-ring insulation cannot meet harsh mechanical cooling or assembly demands, this heavy-duty C4-clearance model acts as the ultimate defense against high-temp seizures and rotor electrical erosion.
In large heavy-duty centrifugal exhaust fans used in steel mills (e.g., Howden systems), extreme exhaust heat conducts along the rotor shaft. For forced cooling, housings are equipped with tight water-cooling jackets requiring an extremely tight interference fit with the bearing’s outer ring for heat transfer. Under such assembly, a fragile outer-ring coating would be scraped off or act as a thermal barrier. TFL 6324/C4VL2071 perfectly bypasses outer-ring mechanical limits using its inner-ring VL2071 coating. Concurrently, its C4 extra-large clearance resolves the extreme differential thermal expansion caused by internal heat (shaft) and external cooling (jacket), thoroughly curing inverter-induced electrical erosion damage.
In large petrochemical refineries, high-power VFD-driven high-temp gas centrifugal compressors by Atlas Copco or Ingersoll Rand often utilize a "top-bottom split" housing design to facilitate lifting the massive rotor. This structure demands absolute outer-ring conformance to the bore to ensure micron-level concentricity. Using an inner-bore insulation design, TFL 6324/C4VL2071 isolates high-frequency VFD currents at the rotor shaft without altering the original precision housing assembly. Its C4 clearance and heavy-duty 63 series structure ensure continuous, safe production under extremely high gas temperatures.
In the dryer sections of ultra-large paper machines by Valmet and Voith, heavy drive motors operate year-round in extremely high-temperature steam environments. To meet the entire machine’s grounding and EMC shielding requirements, some motor end-shields require bare-metal contact directly with the bearing’s outer ring. TFL 6324/C4VL2071 provides a 3000V inner-bore insulation barrier, intercepting leakage currents from the drive shaft. Furthermore, its C4 extra-large clearance safely absorbs the intense thermal stress from high-temp steam, while the steel cage exhibits extremely low friction heat during steady continuous operation, acting as a standard solution for the long-term operation of high-heat zone equipment in paper mills.
*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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