C4 Extra Large Clearance: Engineered with C4 radial internal clearance to accommodate significant thermal expansion in high-heat motors (>100°C) or applications with tight interference fits, preventing seizure.
VL0241 Insulation Technology: The outer ring is coated with plasma-sprayed aluminium oxide, providing a guaranteed breakdown voltage of >3000V DC to stop stray currents and electrical erosion.
Direct Interchangeability: Precise ISO dimensions (85x150x28mm) make it a seamless Replacement for SKF 6217 M/C4VL0241 and equivalent FAG models, requiring no housing modifications.
Longer Service Life: Minimizes maintenance intervals and prevents premature failure in VFD-controlled systems.
The TFL 6217M/C4VL0241 stands as a sophisticated alternative to mainstream brands like SKF, FAG, and NKE. This model offers identical technical specifications to SKF 6217 M/C4VL0241 or FAG 6217-M-J20AA-C4, but at a significantly more competitive price point. TFL bridges this gap by offering flexible MOQs and rapid global logistics.
| TFL | SKF | FAG | NKE | NSK | NTN |
|---|---|---|---|---|---|
| 6217M/C4VL0241 | 6217M/C4VL0241 | 6217-M-J20AA-C4 | 6217-M-C4-SQ77 | 6217HDY2C3 | 7MC3-6217C3 |
Unlike generalist suppliers, TFL implements rigorous 100% spark testing on every coated outer ring to ensure zero porosity and guaranteed dielectric strength. The combination of vacuum-degassed steel and precision-machined brass cages ensures that the bearing can withstand the mechanical stresses of thermal expansion (necessitating the C4 clearance) and heavy vibration.
C4 Radial Clearance (Extra Large): The internal play is significantly larger than Standard (CN) or C3, allowing the inner ring to expand under high shaft temperatures without seizing.
Machined Brass Cage (Suffix M): Provides exceptional strength and wear resistance, essential for dampening vibrations in heavy machinery where steel cages might fatigue.
Dielectric Strength > 3000V DC: The VL0241 ceramic oxide coating on the outer ring is engineered to resist electrical breakdown, protecting raceways from current leakage.
The 6217M/C4VL0241 is a specialized component primarily utilized in heavy industrial environments where equipment faces a “triple threat”: high ambient temperatures (requiring C4 clearance), severe mechanical vibration (requiring a Machined Brass Cage), and Variable Frequency Drive (VFD) induced electrical currents (requiring VL0241 insulation).
The rail transport industry relies heavily on insulated bearings for traction motors, particularly in older electric locomotives and diesel-electric heavy haulers undergoing maintenance. Specifically, this model is often sourced for the overhaul of legacy Bombardier MITRAC or Alstom traction motors used in regional transit. The insulation is vital here because the return current in railway systems flows through the rails, and without protection, “track current” can seek a path through the motor bearings to the chassis, causing immediate welding and failure.
The 6217M/C4VL0241 is a critical component in the generators of mid-sized wind turbines. For instance, brands like Vestas and Siemens Gamesa utilize this bearing size in their auxiliary generators to protect against high-frequency currents. The brass cage and C4 clearance are specifically chosen to handle the turbulent vibration and thermal shifts common in nacelle environments.
High-performance VFD motors, such as the ABB M3BP series or Siemens SIMOTICS 1PH8, frequently employ the 6217M/C4VL0241 to ensure long-term reliability. By isolating the rolling elements from the housing, this bearing prevents the “fluting” pattern on races that leads to premature noise and failure. This is especially vital in precision manufacturing lines where downtime costs thousands per hour.
*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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