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6219/C4VL0241 Electrically Insulated Ball Bearings

6219/C4VL0241 Electrically Insulated Ball Bearings

The picture shows an electrical insulated bearing 6219/C4VL0241. 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.
The picture shows an electrical insulated bearing. Its outer ring has an insulating coating and the cage is made of steel.

OEM & Wholesale 6219/C4VL0241 Insulated Deep Groove Ball Bearing Manufacturer

  • C4 Internal Clearance: Features a C4 radial internal clearance (larger than C3), specifically designed to compensate for significant thermal expansion in high-temperature operating environments.
  • Premium Electrical Insulation: The outer ring is coated with a specialized ceramic layer (VL0241) that provides superior electrical resistance, protecting bearings from stray currents in VFD systems.
  • VFD Compatibility: Essential for motors controlled by frequency converters, eliminating the risk of electric erosion.
  • Drop-In Replacement: With 95x170x32mm dimensions, it is a direct interchange for any standard 6219 series bearing, requiring no housing modifications.
$ 283 /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 6219/C4VL0241
  • Equivalent Interchange 6219/C4VL0241 (SKF), 6219-J20AA-C4 (FAG), 6219-M-C4-SQ77 (NKE), 6219HDY2C3 (NSK), 7MC3-6219C3 (NTN)
  • Product Category Electrically Insulated Ball Bearings
  • Coating Suffix VL0241
  • Insulating Coating Types Insulation coating on outer ring
  • Manufacturers TFL
  • Bore Diameter 95.0 mm
  • Outside Diameter 170.0 mm
  • Width 32.0 mm
  • Net Weight 2.63 kg
  • Basic Dynamic Load Rating 114.0 kN
  • Basic Static Load Rating 81.5 kN
  • Reference Speed 8000.0 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
6219/C4VL0241 Electrically Insulated Ball Bearings Drawing.dwg
Download DWG Download PDF

6219/C4VL0241 Equivalent Interchange Brands

The TFL 6219/C4VL0241 is specifically manufactured for demanding environments where heat is the enemy. We use a high-purity steel composition combined with a plasma-sprayed oxide coating that is tested to adhere perfectly even under the thermal expansion stress that demands a C4 clearance. This ensures the insulation layer doesn’t crack as the bearing ring expands.
TFL SKF FAG NKE NSK NTN
6219/C4VL0241
6219/C4VL0241
6219-J20AA-C4
6219-M-C4-SQ77
6219HDY2C3
7MC3-6219C3

Why Choose TFL 6219/C4VL0241 Electrically Insulated Bearings?

The TFL 6219/C4VL0241 is specifically manufactured for demanding environments where heat is the enemy. We use a high-purity steel composition combined with a plasma-sprayed oxide coating that is tested to adhere perfectly even under the thermal expansion stress that demands a C4 clearance. This ensures the insulation layer doesn’t crack as the bearing ring expands.
The picture shows an electrical insulated bearing 6219/C4VL0241. Its outer ring has an insulating coating and the cage is made of steel.

Features of 6219/C4VL0241

  • Electrically insulated outer ring with high dielectric strength.
  • C4 clearance for high-speed, high-temperature conditions.
  • Compatible with grease or oil lubrication systems.
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Common Applications of Electrically Insulated Bearings

Electrically insulated bearings are widely used in equipment that is susceptible to electrical current damage. By preventing surface pitting, raceway fluting, and premature failure, they significantly improve reliability. The insulation layer protects against voltage-induced corrosion while maintaining efficient rotation and full load-carrying capability, making them especially beneficial in applications that require larger internal clearances to accommodate thermal expansion.
Steel mill maintenance technician installing TFL insulated bearing on Siemens 1LA8 motor NDE.

Drive Motors

In the steel industry, motors driving roller tables often operate under extremely high ambient temperatures. Siemens SIMOTICS 1LA8 series (high-voltage) motors, as well as older 1PQ8 force-ventilated motors, commonly use C4 clearance bearings to prevent shaft seizure caused by thermal expansion from hot steel billets. The 6219/C4VL0241 is applied at the non-drive end (NDE) of these VFD-powered motors. The VL0241 insulation prevents shaft voltage from arcing through the bearing.
High-temp C4 insulated bearings for Howden industrial fan motors.

Industrial Fans

Large axial fans used to exhaust hot gases in cement plants or power stations—such as those manufactured by Howden—impose severe thermal stress on motor bearings. Heat is conducted directly from the fan impeller through the motor shaft to the bearings. Because these fans are almost always VFD-controlled to improve efficiency, an insulated outer ring is essential to prevent electrical discharge machining (EDM) effects that would otherwise lead to premature bearing failure.

Mining locomotive traction motor disassembled revealing insulated bearing on the armature shaft.

Traction Motors

In underground mining operations, electric locomotives operate under harsh conditions with frequent starts, stops, and heavy loads. Traction motors often experience significant heat buildup. The 6219/C4VL0241 is used for rotor support in these DC or AC traction motors. The C4 internal clearance prevents bearing seizure during peak load heating, while the insulation protects the bearing from rail return currents and inverter switching frequencies, which would otherwise degrade the lubricant and raceways.

*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

Is the insulation on the 6219/C4VL0241 affected by the larger C4 clearance?

No, the insulation performance is independent of the mechanical clearance. The VL0241 aluminum oxide coating on the outer ring provides the same 1000V-3000V protection regardless of whether the internal clearance is C3 or C4. The coating is flexible enough to withstand the thermal expansion of the ring.

Are there other variants available in the 6219 insulated bearing series?

Yes, TFL offers options like 6219M/C3VL0241 for brass cage durability, 6219/C3VL0241 for standard clearance, and 6219/C3VL2071 for different insulation needs to fit various setups.
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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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