TFL 6318/C3VL2071 is fully compatible with mainstream equivalents from SKF and FAG in all mechanical dimensions (90mm bore, 190mm OD, 43mm width) and the VL2071 inner-ring insulation standard. Every bearing undergoes strict voltage and insulation resistance testing before leaving the factory. Customers can achieve direct replacement during equipment maintenance without modifying existing shafts or housings.
| SKF | FAG |
|---|---|
|
6318/C3VL2071
|
6318-2Z-J20C-C3
|
TFL has mastered the highly demanding inner-ring plasma spraying process, overcoming technical barriers in coating uniformity for bearing bores. Certified under ISO 9001, every production step adheres to rigorous industrial standards. Compared to the high costs and long lead times of global brands, TFL is dedicated to providing full-cycle support from design to fast delivery, effectively helping clients reduce procurement costs and optimize supply chains without compromising dielectric performance.
Inner-Ring Insulation (VL2071) — High-bond alumina coating on the bore and side faces, preventing high-frequency current leakage.
Heavy-Duty 63 Series — Dimensions 90x190x43 mm, built for extreme radial and moderate axial loads.
Resistance > 50 MΩ — Eliminates fluting damage and extends bearing lifecycle.
TFL 6318/C3VL2071 electrically insulated bearings are engineered for specialized applications requiring “inner-ring insulation.” Typical applications include high-power AC VFD motors, generators, industrial compressors, and large fan systems with high-speed rotating shafts. Its inner-ring coating directly blocks stray currents originating from the rotor shaft, making it a crucial anti-erosion component in heavy industry, paper mills, chemical plants, and power facilities.
In high-power explosion-proof or VFD motors like the Siemens 1LE1 or ABB M3GP series, some housing designs require the bearing’s outer ring to be firmly grounded or tightly fitted. In such cases, TFL 6318/C3VL2071’s inner-ring insulation provides the perfect solution to prevent rotor shaft currents from damaging the bearing. It effectively protects the motor and serves as an ideal alternative to SKF INSOCOAT inner-ring insulated types.
For the drive ends of large centrifugal and rotary screw compressors by Atlas Copco or Ingersoll Rand, heavy loads and high-frequency harmonics from VFDs are major causes of bearing failure. TFL 6318/C3VL2071’s heavy-duty 63 series structure easily handles mechanical loads, while the VL2071 inner-ring coating cuts off the erosion source at the shaft. It is widely recommended for MRO services in such heavy-duty equipment.
In the railway sector, TFL 6318/C3VL2071 inner-ring insulated bearings can be used in AC traction motors for brands like Alstom and CRRC. The high-frequency switching of traction inverters generates strong common-mode voltages, and some motor housing designs dictate that insulation must occur at the bearing inner ring. TFL’s VL2071 bore coating blocks leakage currents directly at the shaft interface. Combined with the shock-resistant heavy-duty 63 series structure, it is a highly recommended anti-erosion solution for the overhaul and maintenance of high-speed trains and heavy-haul locomotives.
*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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