Electrical Protection: Breakdown voltage up to 3000V. Blocks stray currents to prevent electrical corrosion.
Flexible MOQ: Low Minimum Order Quantity (MOQ). Supports both small-batch and large-volume orders.
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 6328M/C3VL2071 is a 100% equivalent and direct replacement for large-size insulated bearings from SKF and FAG in terms of mechanical dimensions (140x300x62mm), solid brass cage design (M), 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 |
|---|---|---|
| 6328M/C3VL2071 | 6328-M-J20C-C3 | 6328-M-C3-SQ77E |
Facing the stringent demands for large-bore insulated bearings with a 140mm bore and a machined brass cage, the technical complexity and supply chain integration requirements are exceptionally high. Relying on a robust premium 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.
Super Heavy-Duty 63 Series — Dimensions 140 x 300 x 62 mm, designed for massive radial and axial load support (self-weight approx. 20.5 kg).
Machined Brass Cage (M) — High-strength solid brass design, optimized for high vibration, severe shocks, and marginal lubrication.
TFL 6328M/C3VL2071 is exclusively designed for VFD systems where the stator and housing have specialized connections, while concurrently facing extreme heavy-duty loads, strong mechanical vibrations, severe impacts, and VFD leakage currents. Typical applications encompass AC traction motors in urban transit or heavy-haul railways requiring absolute stator grounding, main motors of metallurgy hot rolling mills requiring tight water-cooled fits, and massive mining ball mills utilizing split housings. Its solid brass cage provides unmatched mechanical impact rigidity, while the VL2071 inner-bore coating constructs a robust defense protecting the shaft system and grease from discharge burnouts when outer-ring assembly is restricted.
In AC traction motors for high-power locomotives by CRRC or Alstom, to meet strict electromagnetic compatibility (EMC) and grounding protection specifications, the motor end-shield must maintain direct metallic conductive contact with the bearing’s outer ring. This absolutely prohibits the use of outer coatings. TFL 6328M/C3VL2071 employs inner-bore insulation, not only utilizing the heavy-duty cross-section of the 63 series and solid brass cage to firmly support the massive rotor weight and resist track shocks, but also cutting off high-frequency common-mode leakage currents directly at the shaft journal interface, making it a highly recommended anti-erosion component for traction motor overhauls.
In hot and cold rolling main drive motors (such as MW-class heavy-duty systems built by Siemens and ABB) in steel plants, the motors are continuously exposed to radiant high temperatures and immense impacts when billets are gripped. Because the housings feature tight water-cooling jackets for maximum heat dissipation, applying a coating to the outer ring would impede cooling and make the coating highly vulnerable to damage during tight fits. TFL 6328M/C3VL2071’s inner-ring insulation design perfectly bypasses housing assembly limits. The solid brass cage eliminates the risk of fatigue damage on raceways caused by mechanical shocks, while its C3 clearance safely absorbs severe thermal expansion caused by the internal-hot and external-cold temperature gradient.
In the main drive systems of large mining ball mills or high-pressure grinding rolls by Metso, the housing often adopts a “top-bottom split” design to facilitate the lifting of heavy rotors, requiring the bearing’s outer ring to fit flawlessly to the housing bore for absolute concentricity, leaving no room for outer coated tolerances. TFL 6328M/C3VL2071 blocks high-frequency shaft voltages generated by VFD systems directly at the bore without altering the equipment’s original precision housing assembly. Its brass cage and ultra-high compressive strength 63 series structure ensure continuous safe operation for heavy-duty equipment under severe ore-impact vibration 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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