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6320/C4VL0241 Electrically Insulated Ball Bearings

6320/C4VL0241 Electrically Insulated Ball Bearings

The picture shows an electrical insulated bearing 6320/C4VL2071. Its inner ring has an insulating coating and the cage is made of steel.
The picture shows an electrical insulated bearing. Its outer ring has an insulating coating and the cage is made of steel.
The picture shows an electrical insulated bearing. Its outer ring has an insulating coating and the cage is made of steel.
The picture shows an electrical insulated bearing. Its outer ring has an insulating coating and the cage is made of steel.
The picture shows an electrical insulated bearing. Its outer ring has an insulating coating and the cage is made of steel.
The picture shows an electrical insulated bearing. Its outer ring has an insulating coating and the cage is made of steel.

One-Stop Sourcing for 6320/C4VL0241 Bearings: Ideal for Motors, Pumps, and Generators

  • Superior Insulation: Features advanced VL0241 coating that effectively prevents current passage, protecting high-voltage setups from premature failure due to electrical erosion.
  • Cost-Efficiency: Competitive pricing without sacrificing quality, helping to reduce your overall maintenance and procurement costs.
  • Versatile Compatibility: A seamless replacement for major brands like SKF, NTN, FAG, NKE, and NSK.
  • Flexible Options: We provide multiple variants within this series to match your specific clearance and material needs, including: 6320M/C3VL0241 (Brass Cage, C3), 6320/C3VL0241 (Steel Cage, C3), 6320/C4VL0241 (Steel Cage, C4 – Featured Product), and 6320/C3VL2071 (Inner Ring Insulation)
$ 2925 /Each
  • Customized Logo: Min. Order 1 Piece
  • Customized Packaging: Min. Order 1 Piece
  • Inventory: In stock
  • Country of Origin: China
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Bulk orders will be discounted, please contact our sales for a bulk quote. We will ship your order via FedEx within 3-5 working days after you complete the payment and the related information will be sent to your email.
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    Description Interchangeable Features Application Q&A Related products

Product Parameters

  • Model 6320/C4VL0241
  • Equivalent Interchange 6320/C4VL0241 (SKF), 6320-J20AA-C4 (FAG), 6320-M-C4-SQ77 (NKE), 6320HDY2C3 (NSK), 7MC3-6320C3 (NTN)
  • Product Category Electrically Insulated Ball Bearings
  • Coating Suffix VL0241
  • Insulating Coating Types Insulation coating on outer ring
  • Manufacturers TFL
  • Bore Diameter 100.0 mm
  • Outside Diameter 215.0 mm
  • Width 47.0 mm
  • Net Weight 6.98kg
  • Basic Dynamic Load Rating 182.0 kN
  • Basic Static Load Rating 140.0 kN
  • Reference Speed 6700.0 r/min
  • Breakdown Voltage (DC) 1000 ~3000 V
  • Layer Thickness 100~500 µm
  • Electrical Resistance 50~200 MΩ
  • Cage Material Sheet metal
  • Radial Internal Clearance C4
  • ROHS Compliant
  • REACH Compliant
6320/C4VL0241 Electrically Insulated Ball Bearings Drawing.dwg
Download DWG Download PDF

6320/C4VL0241 Equivalent Interchange Brands

TFL’s electrically insulated series is a perfect technical alternative to the SKF VL0241, FAG J20AA, or NKE SQ77 series. Why switch? TFL offers distinct advantages including more flexible Minimum Order Quantities (MOQ), faster global logistics options, and fully customizable features (such as specific internal clearances, laser marking, and custom packaging) to suit your business needs.
TFL SKF FAG NKE NSK NTN
6320/C4VL0241
6320/C4VL0241
6320-J20AA-C4
6320-M-C4-SQ77
6320HDY2C3
7MC3-6320C3

Why Choose TFL 6320/C4VL0241 Electrically Insulated Bearings?

TFL specializes in electrically insulated deep groove ball bearings. The 6320/C4VL0241 features a specialized ceramic aluminum oxide coating on the outer ring. This coating effectively blocks shaft voltage and stray currents generated by inverters (VFDs) from passing through the bearing, preventing electrical corrosion. This significantly extends equipment life and improves reliability. Compared to standard bearings, it is far better suited for modern variable frequency drives, generators, and industrial fans.

Features of 6320/C4VL0241

  • Outer ring with electrical insulation coating (VL0241 type) capable of withstanding voltages above 3000 V DC, with electrical resistance ≥200 MΩ.
  • Single row deep groove ball structure. The C4 radial internal clearance is specifically designed to accommodate thermal expansion in high-temperature operations. Reference speed is approximately 6700 rpm.
  • Inner Diameter (ID) 100 mm, Outer Diameter (OD) 215 mm, Width 47 mm, Weight approx. 6.98 kg.
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Common Applications of Electrically Insulated Bearings

Electrically insulated deep groove ball bearings like the 6320/C4VL0241 are essential in systems involving shaft voltage, VFD drives, and generators/motors. Without an insulation coating, stray currents can flow through the metal path of the bearing to the ground, causing electrical erosion (pitting, fluting) and lubrication failure.
the image shows a petrochemical process pump and a deep groove ball bearing for pumps

Electric Motors

The 6320/C4VL0241 is frequently used in both the Drive End (DE) and Non-Drive End (NDE) of industrial electric motors. In SIMOTICS SD (1LE5 Series) heavy-duty cast iron motors, specifically the 1LE5 355 M/L model (Horizontal mount), the 6320 C4 is often standard for both DE and NDE positions. The insulation coating blocks the current path, avoiding electrical erosion of the raceways and balls, ensuring smooth operation under high loads and speeds.
the image shows a water pump and an insulated deep groove ball bearing

Centrifugal Pumps

Bearings are typically installed in the motor driving the pump. To precisely control flow, high-end VFDs like the ABB ACS880 are often paired with the system. When an ABB M3BP 355 SMA 4 (315kW) motor is used to drive a Sulzer AHLSTAR series pulp pump, insulated bearings are adopted to prevent the VFD from damaging the motor bearings. The 6320 C4 VL0241 supports the motor rotor, withstands axial loads transmitted by the pump, and blocks induced currents.

Crusher Drives

When driving a Metso HP300/400 cone crusher, the motor often operates near its overload limit with significant temperature rise. C4 clearance is strictly necessary due to the dusty and high-vibration mining environments. If the system uses a VSD, upgrading to the insulated VL0241 is critical. The C4 clearance absorbs the severe vibrations and thermal expansion caused by crushing hard rock, while the insulation protects the bearing from high-frequency harmonics generated by the drive.

*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.

Q&A

What is the difference between C3 and C4 clearance in the 6320/C4VL0241 bearing?

C4 clearance is larger than C3. We recommend the 6320/C4VL0241 for applications where the bearing inner ring gets very hot (causing expansion) or for very high-speed motors. If your application runs at standard temperatures, we can also supply the 6320/C3VL0241.

Does the VL0241 coating affect the dimensions of the bearing?

No. The TFL 6320/C4VL0241 is manufactured so that the final dimensions (with the coating) match standard ISO tolerances. You can replace a standard 6320 bearing with our insulated version without machining the shaft or housing.
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We’re more than a supplier; we’re a manufacturing partner with 20+ years of R&D experience. Speak with our engineers, and you’ll find our expertise can solve your electrical erosion issues and significantly reduce long-term maintenance costs.
 
Email: info@sdtflbearings.com
Address: Room 501, Building 1, No. 4567, Tangye Middle Road, Jinan, China

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