TFL 6221M/C4VL0241 is a 100% equivalent to large-size insulated bearings from SKF and FAG in terms of dimensional specifications (105x190x36mm), brass cage design, C4 clearance, and outer-ring ceramic properties. It allows for direct replacement in existing industrial motors and large compressors without any secondary modifications to the shaft or housing, guaranteeing the same excellent long-term operational lifespan.
| SKF | FAG | NKE |
|---|---|---|
|
6221M/C4VL0241
|
6221-M-J20AA-C4
|
6221-M-C4-SQ77
|
Manufacturing large-bore (105mm and above) high-precision insulated bearings demands rigorous process control. TFL utilizes advanced plasma spraying technology to ensure exceptionally high adhesion and uniform insulation across large ceramic-coated areas. Certified by ISO 9001, we conduct strict dielectric and dimensional testing on every unit before shipment. Whether for bulk OEM integration or single-unit urgent MRO replacement in paper or metallurgy sectors, TFL is your professional partner for cost savings and enhanced equipment reliability.
Large Bore Dimensions — 105 x 190 x 36 mm, optimized for large industrial shafts.
Machined Brass Cage (M) — High wear resistance, ensuring safety in high-vibration applications.
Stable Electrical Resistance — Guaranteed 50–200 MΩ, efficiently eliminating VFD-induced fluting.
TFL 6221M/C4VL0241 electrically insulated bearings are developed for heavy-duty systems that must operate continuously under extreme thermal stress and high-power electrical interference. Typical applications include dryer drive motors in large paper machinery, main motors in steel hot strip mills, high-power heavy centrifugal compressors, and ocean marine propulsion motors. Its large size and robust mechanical resilience make it a core component for ensuring continuous production in heavy industries.
In the dryer sections of ultra-wide paper machines by Valmet and Voith, VFD motors operate continuously under extreme steam temperatures. TFL 6221M/C4VL0241’s C4 clearance fully accommodates heat-induced expansion. Combined with a brass cage and 3000V outer-ring insulation, it provides thermal, vibration, and erosion resistance, serving as a highly effective replacement solution for paper mills to avoid unplanned downtime.
In hot strip mills of steel plants, high-power main drive motors manufactured by Siemens and ABB are constantly exposed to radiant heat and severe impact from billet gripping. The solid brass structure of TFL 6221M/C4VL0241 grants this large bearing superior fatigue strength, while its stable ceramic coating completely blocks parasitic shaft currents from VFDs, providing safety redundancy for metallurgical equipment.
In chemical plants or large air separation units, large VFD multi-stage compressors produced by MAN Energy Solutions or Atlas Copco are highly susceptible to strong shaft currents caused by high-frequency harmonics at the motor end. With its 105mm large-bore load capacity and reliable voltage-resistant insulation layer, TFL 6221M/C4VL0241 is frequently recommended for MRO maintenance of such high-value equipment to extend motor lifespan.
*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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