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The NKE 6221-M-C3-SQ77 is an electrically insulated ball bearing with a 105mm bore and 190mm outer diameter, designed to prevent electrical currents from damaging machinery. It features a durable brass cage and a special outer ring coating (SQ77) that resists voltages up to 3000V.
With a dynamic load rating of 141kN, it handles heavy loads while maintaining smooth operation at speeds up to 6100 RPM. The C3 radial clearance ensures reliable performance under varying temperatures and loads.
The insulation layer (100-500µm thick) provides high electrical resistance (50-200 MΩ), making it ideal for electric motors or generators. Its compact 36mm width and 1.26kg weight offer easy integration into existing systems.
Compliant with ROHS standards, this bearing is a safe choice for industries where electrical insulation is critical, such as wind turbines or industrial drives.
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How Is 6221-M-C3-SQ77 Bearing Engineered for Reliability?
6221-M-C3-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, even at high speeds up to 6,100 r/min.
With a basic dynamic load rating of 141 kN, 6221-M-C3-SQ77 Bearing handles heavy loads reliably.
Its breakdown voltage ranges from 1,000 to 3,000 V, making it suitable for electrically demanding applications.
The C3 radial internal clearance allows for thermal expansion, maintaining performance under varying conditions.
6221-M-C3-SQ77 Bearing’s coating thickness of 100-500 µm ensures long-term insulation and durability.
Industrial Uses of 6221-M-C3-SQ77 Bearing
This bearing is commonly used in electric motors and generators, where its insulation coating prevents electrical arcing and extends component life. The brass cage adds durability, making it suitable for high-speed industrial applications.
Where Is 6221-M-C3-SQ77 Bearing Used?
You’ll find 6221-M-C3-SQ77 Bearing in wind turbines and railway systems, where electrical insulation is critical for safety and performance. Its C3 clearance ensures reliable operation even under varying thermal conditions.
Built for Heavy-Duty Use: 6221-M-C3-SQ77 Bearing
In mining equipment, 6221-M-C3-SQ77 Bearing handles heavy loads while its coating resists electrical damage. The high dynamic load rating makes it a dependable choice for harsh environments.
Medical vs Industrial: Where 6221-M-C3-SQ77 Bearing Excels
While not typically used in medical devices, 6221-M-C3-SQ77 Bearing shines in industrial settings like CNC machines. Its insulation properties protect sensitive electronics from stray currents.
Automotive vs Aerospace: Applications of 6221-M-C3-SQ77 Bearing
In hybrid vehicles, 6221-M-C3-SQ77 Bearing supports electric drivetrains by preventing current leakage. Aerospace applications benefit from its lightweight design and electrical resistance.
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