Internal insulation: Protects the bearing from shaft-induced stray currents, ideal when current flows mainly through the shaft rather than the housing.
Plasma Spray Technology: Creates a coating with excellent wear and heat resistance.
Interchangeable: Compatible with SKF/FAG models for a perfect replacement.
Reliable Quality: Compliant with ISO 9001 and REACH standards. The production process is fully traceable.
TFL 6326/C3VL2071 is a 100% equivalent and direct replacement for large-size insulated bearings from SKF and FAG in terms of mechanical dimensions (130x280x58mm), standard heavy-duty steel cage, C3 clearance, and VL2071 parameters. Customers do not need to perform any secondary machining on existing motor shafts or housings during equipment maintenance. All outgoing products pass strict voltage resistance testing (>1000V DC) and dimensional precision checks.
| SKF | FAG |
|---|---|
|
6326/C3VL2071
|
6326-J20C-C3
|
Delivering ultra-heavy-duty inner-ring insulated bearings with a 130mm bore and weighing over 15kg poses strict demands on plasma-spraying uniformity (coating the inner bore is far more difficult than the outer ring) and supply chain precision. Relying on a robust premium power transmission network and an ISO 9001 certified quality control system, TFL seamlessly integrates imported high-density alumina spraying technology with heavy machinery standards. We provide high-reliability anti-erosion solutions rivaling top global brands, backed by a professional engineering team for technical and selection support. With rapid-response stock availability 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) — Dense alumina ceramic coating on the bore and side faces to isolate high-voltage stray currents.
Heavy-Duty 63 Series — Dimensions 130 x 280 x 58 mm, engineered for massive radial load support (approx. 15.2 kg).
High Dielectric Strength — Guaranteed DC breakdown voltage up to 3000 V with resistance > 50 MΩ.
TFL 6326/C3VL2071 is specifically developed for large-scale VFD equipment with restricted housing assemblies that concurrently face extreme radial loads and massive thermal gradients. Typical applications cover MW-class generators requiring stator grounding, metallurgy heavy fans with water-cooled jackets demanding tight housing fits, and large air separation centrifugal compressors in chemical plants using split housings. This model ensures smooth and continuous high-speed runs, providing an irreplaceable rotor electric-erosion barrier in mechanical or electromagnetic shielding designs.
In MW-class large generators and main drive VFD motors manufactured by Siemens or ABB, to meet strict electromagnetic compatibility (EMC) and grounding specifications, the motor end-shield must maintain direct metallic contact with the bearing’s outer ring. Under this design, traditional outer-ring insulated bearings are completely inapplicable. TFL 6326/C3VL2071 utilizes an inner-bore insulation design, which safely and firmly supports the massive rotor weight via the heavy-duty 63 series structure while intercepting leakage currents directly at the shaft journal interface, protecting raceways from discharge damage.
In heavy centrifugal exhaust fans by Howden operating under continuous high-temperature metallurgical environments, extreme exhaust heat conducts directly along the shaft. The bearing's outer ring is usually mounted in a tight water-cooling jacket for maximum heat-dissipation transfer. Applying a ceramic coating on the outer ring here would block heat dissipation and make the coating highly vulnerable to damage during tight fits. TFL 6326/C3VL2071 utilizes its inner-ring VL2071 coating to isolate high-frequency shaft currents on the rotor side, while perfectly managing severe thermal expansion stresses from differential temperature gradients using its C3 clearance, safeguarding the highly thermal shaft system.
For large multi-stage centrifugal compressors by Atlas Copco or MAN Energy Solutions used in chemical air separation units, the housing often adopts a “top-bottom split” design to facilitate the lifting of large-shaft rotors. This structure imposes micron-level tolerances on the concentricity and surface parameters of the housing bore. TFL 6326/C3VL2071 resolves this mechanical assembly contradiction with its inner-ring insulation, eliminating the hazards of high-frequency shaft voltages from VFD drives while avoiding dimensional interference that an outer coated surface might cause to the split-housing fit.
*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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