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NKE Electrically Insulated Single Row Cylindrical Roller Bearing NU221-E-M6-C3-SQ77

NKE Electrically Insulated Single Row Cylindrical Roller Bearing NU221-E-M6-C3-SQ77

The NU221-E-M6-C3-SQ77 is an electrically insulated cylindrical roller bearing with a 105mm bore and 190mm outer diameter, designed to prevent electrical currents from damaging machinery. Its outer ring features a special coating (SQ77) with a breakdown voltage of up to 3000V, making it ideal for electric motors or generators.

With a dynamic load rating of 96.5 kN and a reference speed of 7500 RPM, it handles heavy radial loads efficiently. The brass cage ensures smooth operation, while the C3 radial clearance allows for thermal expansion in high-speed applications.

The insulation layer is over 0.125mm thick, providing reliable protection against electrical arcing. Its resistance exceeds 2000 MΩ, ensuring long-term performance in electrically harsh environments.

Weighing 4.1kg, this bearing is robust yet manageable for installation. Compliant with RoHS and REACH standards, it’s a safe choice for industrial applications where electrical insulation is critical.

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Product Parameters

  • Model NU221-E-M6-C3-SQ77
  • Product Category Electrically Insulated Single Row Cylindrical Roller Bearing
  • 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 4.1 kg
  • Basic Dynamic Load Rating 96.5 kN
  • Basic Static Load Rating 95 kN
  • Reference Speed 7500 r/min
  • Breakdown Voltage (DC) 1000 ~3000 V
  • Layer Thickness > 0.125 mm
  • Electrical Resistance > 2,000 MΩ
  • Cage Material Brass cage
  • Radial Internal Clearance C3
  • ROHS Compliant
  • REACH Compliant
NKE Electrically Insulated Single Row Cylindrical Roller Bearing NU221-E-M6-C3-SQ77 dimension drawing
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Features

How Is NU221-E-M6-C3-SQ77 Bearing Engineered for Reliability?

NU221-E-M6-C3-SQ77 Bearing features an insulation coating on the outer ring, preventing electrical damage in high-voltage environments.
The brass cage ensures smooth operation and reduces friction, even at high speeds up to 7,500 r/min.
With a basic dynamic load rating of 96.5 kN, it handles heavy loads reliably.
Its C3 radial internal clearance allows for thermal expansion, maintaining performance under varying conditions.

Application

Industrial Uses of NU221-E-M6-C3-SQ77 Bearing
NU221-E-M6-C3-SQ77 Bearing is commonly used in electric motors and generators, where its electrically insulated coating prevents current leakage and reduces damage from stray currents. The brass cage ensures smooth operation even under high-speed conditions.

What Makes NU221-E-M6-C3-SQ77 Bearing a Preferred Choice?
In wind turbines, NU221-E-M6-C3-SQ77 Bearing handles heavy radial loads while its insulation protects against electrical arcing. The C3 clearance allows for thermal expansion, making it reliable in fluctuating temperatures.

Perfect Fit for Automation: NU221-E-M6-C3-SQ77 Bearing
NU221-E-M6-C3-SQ77 Bearing works well in robotic arms and CNC machines, where precision and electrical insulation are key. Its high dynamic load rating ensures longevity in continuous operation.

Medical vs Industrial: Where NU221-E-M6-C3-SQ77 Bearing Excels
NU221-E-M6-C3-SQ77 Bearing is ideal for medical imaging devices, offering quiet and reliable performance. In industrial settings, it excels in conveyor systems, thanks to its durability and electrical resistance.

Q&A

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