NKE Electrically Insulated Single Row Cylindrical Roller Bearings
NKE Electrically Insulated Single Row Cylindrical Roller Bearings provide enhanced protection against electrical currents in demanding applications. With reliable ceramic insulation and high voltage resistance, these bearings ensure long-term performance in electric motors and generators.
Reliable Insulation with Advanced Ceramic Coating
NKE Electrically Insulated Single Row Cylindrical Roller Bearings are specifically developed to prevent electrical damage in electric machinery. The most common issue in such applications is electrical corrosion, caused by current passing through the bearing. This may result in pitting, fluting, or even complete bearing failure.
NKE addresses this challenge by applying a plasma-sprayed oxide ceramic coating to either the outer ring (SQ77) or inner ring (SQ77E). This insulating layer effectively blocks electrical currents up to 1000V AC or DC, reducing the risk of unplanned downtime.
In addition, the insulation layer has strong adhesion and mechanical resistance, meaning it will not peel off during normal installation and operation. Compared to insulating the shaft or housing, using NKE Electrically Insulated Single Row Cylindrical Roller Bearings is more cost-effective and reduces maintenance effort.
Engineered for Electric Machines and High-Speed Applications
NKE Electrically Insulated Single Row Cylindrical Roller Bearings are widely used in industries where electrical currents and high-speed operation are common.
One of the most critical uses is in AC and DC electric motors, especially those operating with variable frequency drives (VFDs). These conditions increase the risk of current leakage, which NKE bearings are specifically designed to withstand, ensuring longer service life and greater operational safety.
These bearings are also ideal for wind turbine generators, where insulation prevents arc damage, helping maintain turbine uptime and long-term reliability in remote or hard-to-service environments.
In railway traction motors, NKE bearings are built to endure constant vibrations, frequent start-stop cycles, and voltage fluctuations. Their insulating design shields internal components from high-voltage current damage.
Additionally, NKE insulated bearings are used in industrial compressors, power plants, and automated machinery. Customers benefit from reduced maintenance intervals and improved equipment efficiency by choosing NKE Electrically Insulated Bearings.
Optimized Design for Current Protection and Compatibility
The design of NKE Electrically Insulated Bearings blends mechanical robustness with superior insulation properties. These bearings are dimensionally aligned with ISO standards, making them fully compatible with standard bearing housings.
They are available in multiple configurations:
- Designs: NJ, NU, NUP
- Dimension series: 210–230, 310–330
- Cage materials: Brass or Polyamide
- Radial clearances: C0, C3, C4
This means users can directly replace conventional bearings with NKE insulated bearings—no modification needed.
The insulating coating is highly resistant to abrasion and mechanical stress, ensuring durability under normal installation and use. Its surface treatment also minimizes dust accumulation and reduces contamination, further extending service life.
Each bearing undergoes strict testing and quality control to meet international performance standards. For customers seeking high reliability and electrical protection, NKE insulated bearings are a trusted choice.
HOT PRODUCTS
FREQUENTLY ASKED QUESTIONS
Why do I need electrically insulated bearings?
You need electrically insulated bearings to prevent damage caused by electrical currents passing through them. These currents can lead to electrical corrosion, which pits the raceways and shortens the bearing's lifespan. This is especially common in electric motors, generators, and railway applications where stray currents are present. Using insulated bearings protects your machinery and reduces maintenance costs.
How do NKE Electrically Insulated Bearings work?
NKE Electrically Insulated Bearings feature a thin, highly resistant oxide ceramic layer applied to one of the bearing rings (either inner or outer, depending on the variant like SQ77 or SQ77E). This non-conductive coating effectively blocks the passage of electrical current, preventing damage to the rolling elements and raceways. The insulation has a guaranteed breakdown resistance of at least 1000V AC or DC.
Are NKE insulated bearings interchangeable with standard bearings?
Yes, NKE Electrically Insulated Single Row Cylindrical Roller Bearings are designed to be fully interchangeable with conventional bearings. They have the same dimensions and technical properties as their non-insulated counterparts. This makes it easy to replace standard bearings with insulated ones without requiring any modifications to your existing machinery or housing.
What applications benefit most from NKE electrically insulated bearings?
Applications that benefit most include those where electrical currents are a common issue. This primarily covers electric motors (both AC and DC), generators (especially in wind turbine generators), and traction motors found in railway vehicles. Essentially, any machinery susceptible to current passage will see improved reliability and extended lifespan with NKE Electrically Insulated Single Row Cylindrical Roller Bearings.