Plasma Spray Technology: Creates a coating with excellent wear and heat resistance.
Reliable Quality: Compliant with ISO 9001 and REACH standards. The production process is fully traceable.
Interchangeable: Compatible with SKF/FAG models for a perfect replacement.
Competitive Pricing: Efficient sourcing channels allow us to offer more competitive pricing than the market average.
TFL 6328/C3VL2071 is a 100% equivalent and direct replacement for large-size insulated bearings from SKF and FAG in terms of mechanical dimensions (140x300x62mm), standard pressed steel cage structure, C3 clearance, and VL2071 inner-ring standards. All bearings undergo strict voltage resistance and insulation resistance testing before dispatch. Customers can achieve direct replacement without changing the original motor shaft or end-shields.
| SKF | FAG | NKE |
|---|---|---|
| 6328/C3VL2071 | 6328-J20C-C3 | 6328-M-C3-SQ77E |
Supplying ultra-heavy-duty inner-ring insulated bearings with a 140mm bore and weighing over 20kg (where controlling bore-coating adhesion is far more complex than on the outer ring) is a test of premium supply chains and quality management. Relying on a robust premium power transmission supply chain network and a strict quality control system, TFL provides high-quality products that deeply integrate advanced coating processes with precision mechanical standards. We not only provide high-reliability anti-erosion solutions rivaling top global brands but also offer professional technical support from our engineering team for selection and diagnostics. 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) — High-bond alumina coating on the bore and side faces to isolate high-voltage stray currents directly at the source.
Standard Heavy-Duty Steel Cage — Lightweight and low friction, optimized for steady, continuous heavy-load running.
High Dielectric Strength — Guaranteed DC breakdown voltage up to 3000 V with resistance > 50 MΩ.
TFL 6328/C3VL2071 is specifically developed for large-scale VFD drive systems with restricted housing assemblies that concurrently face heavy loads and VFD leakage currents. Typical applications encompass MW-class generators where the stator must be grounded for EMC shielding, metallurgy exhaust fans with tight cooling jackets, and high-precision split-housing centrifugal compressors. The standard pressed steel cage maintains excellent low-friction performance under continuous steady-state runs, while the inner-ring ceramic insulation provides a long-lasting, safe anti-erosion barrier without altering original precision mechanical fits.
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 6328/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 high-frequency leakage currents directly at the shaft journal interface. Its pressed steel cage delivers exceptionally low rotational friction, making it the ideal solution for large generator overhauls.
In heavy centrifugal exhaust fans by Howden operating under continuous high-temperature metallurgical environments, extreme exhaust heat conducts along the rotor main 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 6328/C3VL2071 bypasses housing assembly limits using its inner-ring VL2071 coating. Its standard steel cage adapts to steady high-speed operations, and the C3 clearance resolves differential thermal expansion caused by internal heat and external cooling, thoroughly curing inverter-induced electrical erosion and extending bearing life.
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 6328/C3VL2071 resolves this mechanical assembly contradiction with its inner-ring insulation. Without altering the original precision housing assembly processes, it isolates high-frequency VFD currents right at the rotor shaft, while its standard pressed steel cage ensures minimal running resistance and energy consumption under high-speed operations.
*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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