Alumina Coating: Breakdown voltage up to 3000V and resistance up to 200 MΩ.
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.
Service Response: All inquiries are answered within 24 hours.
TFL 6324/C3VL2071 perfectly achieves direct replacement for equivalent inner-ring insulated heavy-duty bearings from international brands like SKF and FAG in terms of dimensions (120x260x55mm), C3 clearance standard, and VL2071 electrical parameters. All delivered products pass strict dielectric and dimensional precision testing, ensuring safe and reliable “plug-and-play” installation in complex, high-heat, and heavy-load VFD systems.
| SKF | FAG |
|---|---|
|
6324/C3VL2071
|
6324-J20C-C3
|
Manufacturing ultra-heavy-duty inner-ring insulated bearings with a 120mm bore and 260mm OD poses extreme challenges in controlling bore plasma-spray adhesion and large-scale precision machining. Relying on a robust premium industrial transmission supply chain network and a strict ISO 9001 certified quality control system, TFL seamlessly integrates internationally advanced temperature-controlled spraying processes into heavy machinery standards. We provide high-reliability anti-erosion products rivaling top global brands, backed by a professional engineering team for technical selection and diagnostic support. With rapid-response delivery and No MOQ services, TFL is dedicated to helping global industrial clients eliminate lead-time risks on specialized heavy parts, achieving significant cost optimization.
Inner-Ring Insulation (VL2071) — High-bond alumina coating on the bore and side faces to intercept shaft currents directly at the source.
Heavy-Duty 63 Series Design — Massive 120 x 260 x 55 mm dimensions, engineered for extreme radial loads.
Standard Heavy-Duty Steel Cage — Optimized for low friction and steady, continuous operation in large machinery.
TFL 6324/C3VL2071 inner-ring insulated heavy-duty bearings are exclusively designed for giant industrial equipment facing “restricted housing assemblies” alongside ultra-high loads and VFD leakage currents. Typical applications encompass MW-class generators where stators must be forcefully grounded, metallurgy heavy fans requiring ultra-tight water-cooled assemblies, and large mining hoists or centrifugal compressors using split-housing designs. When outer-ring insulation cannot satisfy mechanical or electrical shielding designs, this heavy-duty model serves as the ultimate defense protecting the rotor shaft system from electrical erosion.
In MW-class large industrial generators or main locomotive traction motors built by ABB or Siemens, to meet strict electromagnetic compatibility (EMC) and grounding protection codes, the motor end-shield must maintain direct metallic conductive contact with the bearing’s outer ring. This strictly prohibits outer-ring insulated bearings. TFL 6324/C3VL2071 employs inner-bore insulation, not only utilizing the heavy-duty cross-section of the 63 series (260mm OD) to firmly support the massive rotor weight but also cutting off high-frequency leakage currents directly at the shaft journal, making it the preferred reliable solution in generator overhauls.
In large heavy-duty centrifugal fans used in steel mills (e.g., Howden systems), extreme exhaust heat conducts along the rotor shaft. For forced cooling, housings are often equipped with tight water-cooling jackets requiring an extreme interference fit with the bearing's outer ring for heat transfer. Under such assembly, a fragile outer-ring coating would be scraped off or act as a thermal barrier. TFL 6324/C3VL2071 perfectly bypasses the outer-ring mechanical limits using its inner-ring VL2071 coating. Meanwhile, its C3 large clearance resolves the dangerous differential thermal expansion caused by internal heat and external cooling, thoroughly curing inverter-induced electrical erosion damage.
At the drive ends of large mine hoists or giant Atlas Copco centrifugal compressors, the housing often utilizes a “top-bottom split” design to facilitate the lifting of heavy rotors. This structure imposes exceptionally strict requirements on the outer ring’s concentricity and surface tolerances, usually forbidding any ceramic coatings. TFL 6324/C3VL2071 intercepts high-frequency shaft voltages generated by VFD systems via the bore without altering the equipment’s original precision housing assembly. Its 63 series ultra-high compressive strength ensures continuous and safe production for heavy-duty equipment under harsh conditions.
*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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