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6220M/C4VL0241 Electrically Insulated Ball Bearings

6220M/C4VL0241 Electrically Insulated Ball Bearings

The picture shows an electrical insulated bearing 6220M/C4VL0241. Its outer ring has an insulating coating and the cage is made of brass.
The picture shows an electrical insulated bearing. Its outer ring has an insulating coating and the cage is made of brass.
The picture shows an electrical insulated bearing. Its outer ring has an insulating coating and the cage is made of brass.
The picture shows an electrical insulated bearing. Its outer ring has an insulating coating and the cage is made of brass.
The picture shows an electrical insulated bearing. Its outer ring has an insulating coating and the cage is made of brass.
The picture shows an electrical insulated bearing. Its outer ring has an insulating coating and the cage is made of brass.

Solve Bearing Overheating & Current Damage: C4 Clearance Insulated Bearing 6220M/C4VL0241

  • Machined Brass Cage (M): Equipped with a heavy-duty machined brass cage, the 6220M/C4VL0241 offers superior resistance to vibration and high speeds compared to standard steel cages.
  • Premium Electrical Insulation: The VL0241 ceramic coating on the outer ring provides electrical resistance up to 1000V DC (and often higher), effectively blocking stray currents.
  • Dimensional Precision: Precision-manufactured to ISO standards, featuring the standard 6220 dimensions of 100×180×34 mm.
  • Versatile Application: Optimized for Variable Frequency Drives (VFDs), wind generators, and traction motors where electrical leakage is a critical risk.
$ 375 /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 6220M/C4VL0241
  • Equivalent Interchange 6220M/C4VL0241 (SKF), 6220-M-J20AA-C4 (FAG), 6220-M-C4-SQ77 (NKE), 6220HDY2C3 (NSK), 7MC3-6220C3 (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 180.0 mm
  • Width 34.0 mm
  • Net Weight 3.69 kg
  • Basic Dynamic Load Rating 127.0 kN
  • Basic Static Load Rating 93.0 kN
  • Reference Speed 7500.0 r/min
  • Breakdown Voltage (DC) 1000 ~3000 V
  • Layer Thickness 100~500 µm
  • Electrical Resistance 50~200 MΩ
  • Cage Material Brass cage
  • Radial Internal Clearance C4
  • ROHS Compliant
  • REACH Compliant
6220M/C4VL0241 Electrically Insulated Ball Bearings Drawing.dwg
Download DWG Download PDF

6220M/C4VL0241 Equivalent Interchange Brands

You can achieve highly competitive pricing without compromising quality, allowing for better profit margins on repair and maintenance projects. We also understand that downtime is costly. Unlike large brands with rigid logistics systems, TFL offers flexible MOQ and expedited shipping options to help you respond quickly to urgent needs.
In addition, we provide custom laser marking and packaging solutions tailored to your requirements. More than just a supplier, TFL is your partner in business growth.
TFL SKF FAG NKE NSK NTN
6220M/C4VL0241
6220M/C4VL0241
6220-M-J20AA-C4
6220-M-C4-SQ77
6220HDY2C3
7MC3-6220C3

Why Choose TFL 6220M/C4VL0241 Electrically Insulated Bearings?

TFL utilizes advanced plasma-spray technology to apply the ceramic coating, ensuring a robust bond with the substrate that resists cracking under thermal stress. Paired with our heavy-duty machined brass cage, this bearing is specifically engineered to withstand the rigorous electrical and mechanical demands of modern industrial machinery.
The picture shows an electrical insulated bearing 6220M/C4VL0241. Its outer ring has an insulating coating and the cage is made of brass.

Features of 6220M/C4VL0241

  • Machined brass cage (M) for enhanced operational stability
  • Manufactured from premium bearing steel with advanced heat treatment for extended basic rating life
  • A robust aluminum oxide ceramic coating on the outer ring provides a reliable electrical insulation barrier, effectively preventing electrical erosion
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Common Applications of Electrically Insulated Bearings

Electrically insulated bearings are commonly used in applications where rotating equipment is exposed to electrically induced damage, such as motors and drives. The insulation acts as a protective barrier, blocking electrical current paths through the bearing. This helps prevent corrosion, lubricant degradation, and premature failure—ultimately improving reliability and reducing unplanned downtime.
Image of electrically insulated bearing installed in an electric motor assembly

Variable Frequency Drive (VFD) Motors

High-frequency switching in VFDs generates shaft voltages that, if left unprotected, discharge through standard bearings and cause premature failure. In mining ventilation systems, WEG W22 motors incorporate the 6220M/C4VL0241 on the non-drive end (NDE) to provide protection in dusty, variable-load environments. The bearing’s insulated outer ring shields against common-mode currents generated by the inverter, while its unrestrained mounting accommodates thermal expansion and extends service life.
Photo showing insulated bearing in a water pump mechanism

Pumps

In pump applications, the 6220M/C4VL0241 mitigates corrosion caused by grounding or drive-induced electrical currents, ensuring consistent fluid transfer performance. Its C4 internal clearance is especially beneficial for pumps handling warm fluids. For example, KSB Etanorm pumps operating in chemical circulation or irrigation systems rely on the 6220M/C4VL0241 to support high flow rates, resist VFD-related electrical currents, and prevent circulating current damage commonly seen in motor bearings.

Illustration of insulated bearing within a wind turbine generator

Wind Turbines

In wind turbine applications, the 6220M/C4VL0241 electrically insulates generator components from high-frequency currents generated by power converters, contributing to overall renewable energy system reliability. GE 1.5-77 turbines use this bearing in yaw motors for blade alignment. The machined brass cage (M) withstands sudden load changes typical of wind power applications, while the insulation protects against grid fluctuations—ensuring stable energy output under variable climate 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.

Q&A

How much larger is C4 clearance compared to C3? When is C4 a must-have choice?

C4 clearance is larger than C3 within defined standard ranges. C4 is recommended when the equipment operates under: (1) Very high expected bearing temperatures (e.g., high ambient or internal heat), (2) Heavy shock loads or constant strong vibration, (3) Interference fits on both shaft and housing with differing thermal expansion coefficients. It provides essential space for internal thermal expansion, preventing excessive heat and premature failure.

Does the insulation coating affect heat dissipation or dimensional accuracy?

No negative impact. High-quality alumina coatings (e.g., VL0241) are applied precisely via processes like plasma spraying. The coating is uniform and very thin (typically 100-200 microns), already factored into the standard outer diameter dimension. Alumina has good thermal conductivity, so it doesn‘t hinder normal heat transfer. The bearing’s dimensional accuracy and tolerance fully comply with ISO standards.
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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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