Inner Ring Insulation (VL2071): Effectively blocks shaft currents from damaging the raceways.
Machined Brass Cage (M): Equipped with a heavy-duty, two-piece machined brass cage to withstand the high inertia and shock loads common in large-scale machinery.
Current Leakage Protection: Provides electrical resistance > 50 MΩ at 3000V DC, effectively protecting the rolling elements and raceways from electrical erosion.
Stock availability with no MOQ; OEM/ODM and fast delivery supported.
The TFL 6238M/C3VL2071 is a high-performance precision alternative to SKF 6238 M/C3VL2071 and FAG 6238-M-C3-J20C. For heavy industry professionals, we offer more than just a component; we offer supply chain security. By choosing TFL, you benefit from shorter lead times for large-size bearings, lower minimum order quantities, and significant cost savings without sacrificing the micron-level accuracy required for high-voltage machinery. Our bearings are designed to drop seamlessly into existing systems from brands like ABB, Siemens, and GE.
| SKF | FAG |
|---|---|
|
6238M/C3VL2071
|
6238-M-J20C-C3
|
TFL applies plasma spraying on the inner ring to build a dense Al₂O₃ insulating layer. With ISO 9001, ROHS and REACH compliance, we support you from design to delivery with reliable performance and competitive cost. The 6238M/C3VL2071 combines the structural integrity of a machined brass cage with a state-of-the-art ceramic coating. This prevents the fluting caused by VFD-induced currents, ensuring your high-power assets remain operational in the most demanding conditions.
Inner-ring alumina coating (VL2071) — uniform ≈100–500 μm ceramic layer; standard 6238 boundary dimensions, drop-in fit.
Dielectric strength (DC) — up to 3000 V; insulation resistance 50–200 MΩ.
Machined brass cage (M) — Stable performance under high rotational speeds and loads.
Used in generators, VFD motors, compressors, and wind power units. Inner-ring insulation breaks the current path from the rotor side, reducing fluting and lubricant film damage.
Wind turbines in the 2MW to 3MW class, such as older Vestas V90 or Gamesa G8x/G9x platforms, utilize large generators. The 6238M/C3VL2071 is frequently specified for the generator’s rotor support. Due to the high-frequency switching of the power converters used to synchronize with the grid, common mode voltages are generated on the shaft. Inner ring insulation is critical here because it provides a reliable barrier at the source of the shaft voltage.
In the oil and gas sector, Elliott Group or Man Energy Solutions utilize these bearings in large compressor trains. The 6238M/C3VL2071 ensures that the motor driving the compressor is isolated from electrical noise, preventing bearing surface degradation that could lead to catastrophic failure in explosive environments.
Deep shaft mining operations use massive electric motors to drive the hoists that lift personnel and ore. ABB Mine Hoist Motors (e.g., AMZ series) are prime examples of this application. These are often large synchronous or asynchronous motors where the shaft diameter exceeds 180mm. The 6238M/C3VL2071 is used to support the heavy rotor. Inner ring insulation is selected to allow the outer housing to be grounded directly for safety, while the ceramic coating on the bore prevents the current from arcing through the bearing rolling elements.
*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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