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NKE Electrically Insulated Ball Bearings 6221-M-C4-SQ77

NKE Electrically Insulated Ball Bearings 6221-M-C4-SQ77

The 6221-M-C4-SQ77 is an electrically insulated ball bearing with a 105mm bore and 190mm outer diameter, designed to prevent electrical current damage. It handles dynamic loads up to 141 kN and spins smoothly at speeds up to 6100 RPM.

Its outer ring features a special insulation coating (SQ77) with a breakdown voltage of 1000-3000V, ideal for protecting against electrical arcing. The brass cage ensures durability and stable performance under high loads.

With a C4 radial clearance, it accommodates thermal expansion in demanding conditions. Suitable for electric motors, generators, or any application where electrical insulation is crucial.

Weighing 3.86kg, it’s robust yet manageable for industrial use. Compliant with RoHS standards for safe operation.

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Product Parameters

  • Model 6221-M-C4-SQ77
  • Product Category Electrically Insulated Ball Bearings
  • Insulating Coating Types Insulation coating on outer ring
  • Coating Suffix SQ77
  • Manufacturers NKE
  • Bore Diameter 105.0 mm
  • Outside Diameter 190.0 mm
  • Width 36.0 mm
  • Net Weight 3.86 kg
  • Basic Dynamic Load Rating 141.0 kN
  • Basic Static Load Rating 105.0 kN
  • Reference Speed 6100.0 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
NKE Electrically Insulated Ball Bearings 6221-M-C4-SQ77 dimension drawing
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Features

How Is 6221-M-C4-SQ77 Bearing Engineered for Reliability?

6221-M-C4-SQ77 Bearing features an insulating coating on the outer ring, preventing electrical damage in high-voltage environments.
The brass cage ensures smooth operation and reduces friction, enhancing overall performance.

With a basic dynamic load rating of 141.0 kN, it handles heavy loads efficiently.
Its breakdown voltage ranges from 1000 to 3000 V, making it suitable for electrically demanding applications.

The C4 radial internal clearance allows for thermal expansion, ensuring reliability under varying temperatures.
6221-M-C4-SQ77 Bearing’s reference speed of 6100 r/min balances speed and durability.

Application

Industrial Uses of 6221-M-C4-SQ77 Bearing
The 6221-M-C4-SQ77 Bearing is commonly used in industrial motors and generators, where electrical insulation prevents current damage. Its brass cage and C4 clearance ensure smooth operation even under high loads.

Where Is 6221-M-C4-SQ77 Bearing Used?
You’ll often find 6221-M-C4-SQ77 Bearing in wind turbines, where its insulation coating protects against stray currents. The high dynamic load rating makes it reliable for long-term use in demanding environments.

Built for Heavy-Duty Use: 6221-M-C4-SQ77 Bearing
This bearing handles heavy loads in mining equipment, thanks to its robust design and insulation properties. The 190mm outer diameter provides stability in large machinery.

Automotive vs Aerospace: Applications of 6221-M-C4-SQ77 Bearing
In automotive electric drives, 6221-M-C4-SQ77 Bearing prevents electrical arcing, while in aerospace, its lightweight design is a plus. Both sectors benefit from its high-speed capability.

Perfect Fit for Automation: 6221-M-C4-SQ77 Bearing
Automation systems like robotic arms use 6221-M-C4-SQ77 Bearing for its precision and electrical safety. The 36mm width fits neatly into compact spaces without sacrificing performance.

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