Electrical Protection: Breakdown voltage up to 3000V. Blocks stray currents to prevent electrical corrosion.
Ample Stock: A stable supply chain and sufficient inventory enable us to fulfill most orders.
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 6230/C4VL2071 is a 100% equivalent and direct replacement for large-size insulated bearings from SKF and FAG in terms of mechanical dimensions (150x270x45mm), standard pressed steel cage structure, C4 clearance, and VL2071 inner-ring standards. All bearings undergo strict voltage resistance and insulation resistance testing before dispatch. Customers can achieve direct replacement without changing the original motor shaft or end-shields.
| SKF | FAG |
|---|---|
| 6230/C4VL2071 | 6230-J20C-C4 |
Focusing on the demand for high-end large-bore bearings combining a 150mm bore with C4 extra-large clearance and inner-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.
Inner-Ring Insulation (VL2071) — High-bond alumina coating on the bore and side faces to isolate high-voltage stray currents directly at the source.
Large-Bore Medium Series — Dimensions 150 x 270 x 45 mm, robustly supporting heavy radial loads.
C4 Extra-Large Clearance — Absolutely critical for surviving extreme temperature gradients and massive heat transfer.
TFL 6230/C4VL2071 inner-ring insulated bearings are developed for VFD equipment facing “extreme heat coupled with strong VFD electrical discharge” yet maintaining relatively smooth and steady running without severe shocks. Typical applications encompass high-temperature dryer main drive shafts in large paper machinery where the stator must be grounded for EMC shielding, metallurgy hot strip rolling lines requiring tight water-cooled fits, and large high-temp gas centrifugal compressors using split-housing designs. Its C4 extra-large clearance guarantees mechanical running margins under extreme temperature gradients, the steel cage provides excellent low friction and high energy efficiency, and the inner-ring ceramic insulation directly blocks high-frequency shaft voltages at the source to protect raceways.
In high-power VFD-driven generators manufactured by Siemens or ABB, to meet strict grounding and electromagnetic compatibility (EMC) codes, the motor end-shield must maintain direct bare-metal contact with the bearing’s outer ring. This strictly prohibits outer-ring coatings, making inner-ring insulation mandatory. TFL 6230/C4VL2071 not only utilizes its 150mm large-bore medium cross-section to firmly support the massive rotor weight but also cuts off high-frequency leakage currents directly at the shaft journal interface. Its C4 clearance effectively releases extreme thermal expansion under full-load running, while the low-friction pressed steel cage guarantees smooth and energy-efficient continuous operations, making it the preferred choice for generator overhauls.
In VFD dust-extracting and exhaust centrifugal fans in steel hot rolling production lines, extreme exhaust heat conducts directly along the rotor shaft to the bearing bore. Because the bearing housing features an ultra-tight water-cooling jacket, applying a coating to the outer ring would impede cooling and make the coating highly vulnerable to damage during tight interference fitting. TFL 6230/C4VL2071’s inner-ring insulation design perfectly matches this heat-dissipation structure, isolating induced shaft currents while ensuring excellent housing thermal conductivity. The lightweight steel cage maintains exceptionally low temperature rises under continuous heavy-load running, and the C4 extra-large clearance safely absorbs severe differential thermal expansion caused by the internal-hot (shaft) and external-cold (water jacket) gradient, safeguarding the equipment's continuous runs.
For large multi-stage VFD centrifugal compressors in petrochemical air separation units, the housing often adopts a split-type design to facilitate the lifting of large-shaft rotors. This structure demands absolute outer-ring conformance to the housing bore with micron-level tolerances, leaving no room for outer coated interference. TFL 6230/C4VL2071 resolves this mechanical assembly contradiction with its inner-ring insulation. Without altering the original precision housing assembly processes, it isolates high-frequency VFD currents right at the rotor shaft, while its standard pressed steel cage ensures minimal running resistance and energy consumption under high-speed operations, and its C4 clearance safely accommodates the high-temp shaft caused by high-speed process gas heat transfer.
*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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