Electrical Protection: Breakdown voltage up to 3000V. Blocks stray currents to prevent electrical corrosion.
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.
Plasma Spray Technology: Creates a coating with excellent wear and heat resistance.
TFL 6326M/C3VL2071 is a 100% equivalent and direct replacement for large-size insulated bearings from SKF and FAG in terms of mechanical dimensions (130x280x58mm), solid brass cage design (M), 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 |
|---|---|
| 6326M/C3VL2071 | 6326-M-J20C-C3 |
Supplying ultra-heavy-duty inner-ring insulated bearings with a 130mm bore, weighing over 15kg, and equipped with a machined brass cage poses strict demands on plasma-spraying uniformity (coating the inner bore is far more difficult than the outer ring) and precision large-bearing tolerances. Relying on a robust premium industrial transmission supply chain 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 selection and diagnostic 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) — High-bond dense alumina coating on the bore and side faces to isolate high-voltage stray currents right at the source.
Heavy-Duty 63 Series — Dimensions 130 x 280 x 58 mm, engineered for massive radial and axial load support (self-weight approx. 15.2 kg).
Machined Brass Cage (M) — High-strength solid brass design, optimized for high vibration, severe shocks, and marginal lubrication.
TFL 6326M/C3VL2071 inner-ring insulated heavy-duty bearings are exclusively designed for large-scale VFD equipment with restricted housing assemblies that concurrently face extreme radial loads, severe mechanical vibrations, and high-voltage stray currents. Typical applications encompass AC traction motors in rail transit requiring absolute stator grounding, metallurgy heavy fans with water-cooled jackets demanding tight housing fits, and large mining hoists or centrifugal compressors using split housings. This model provides robust mechanical resilience while acting as an irreplaceable rotor electric-erosion barrier in mechanical or electromagnetic shielding designs.
In AC traction motors of heavy-haul locomotives by CRRC and Alstom, motors experience strong common-mode voltages from high-frequency inverters alongside severe mechanical shocks transmitted from the tracks. To meet strict electromagnetic compatibility (EMC) and grounding specifications, the motor end-shield must maintain direct metallic contact with the bearing’s outer ring. This absolutely prohibits outer-ring insulated bearings. TFL 6326M/C3VL2071’s solid brass cage perfectly resists mechanical vibration, while the VL2071 insulation coating completely cuts off shaft current leakage loops. It is a highly recommended safety upgrade component for traction motor overhauls.
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 6326M/C3VL2071 utilizes its inner-ring VL2071 coating to isolate high-frequency shaft currents on the rotor side. Its solid brass cage resists unbalanced airflow vibrations, while its C3 clearance resolves dangerous differential thermal expansion, thoroughly curing inverter-induced electrical erosion.
For large centrifugal compressors by Atlas Copco 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, leaving no room for outer coated tolerances. TFL 6326M/C3VL2071 resolves this mechanical assembly contradiction with its inner-ring insulation, eliminating the hazards of high-frequency shaft voltages from VFD drives while avoiding localized stress concentrations that an outer coated surface might cause to the split-housing fit. Its robust brass cage further ensures long-term stability for high-pressure compressors.
*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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