Products
Insulated Cylindrical Roller Bearings
Product Overview
Insulated Cylindrical Roller Bearings are designed for applications requiring high radial load capacity together with protection against electrical current damage. Their roller design provides strong load support and stable running accuracy, while the insulated structure helps reduce current passage through the bearing.
These bearings are commonly used in large electric motors, generators, railway traction systems, machine tools, mining machinery, and other heavy industrial rotating equipment where electrical erosion can quickly shorten bearing life. Insulation helps reduce raceway fluting, arc marks, lubricant deterioration, vibration, and unplanned maintenance.
ETM can support different cylindrical roller bearing configurations, clearance classes, cage materials, lubrication options, insulation levels, and inspection requirements according to operating load, speed, mounting method, and reliability targets.
Technical Specifications
| Product Type | Insulated cylindrical roller bearings |
| Common Series | NU, NJ, N, NUP and application-specific cylindrical roller bearing designs |
| Insulation Method | Ceramic-coated outer ring, ceramic-coated inner ring, or custom electrical insulation design |
| Load Direction | High radial load capacity; axial capacity depends on bearing configuration |
| Typical Applications | Large motors, generators, machine tools, mining machinery, railway traction equipment |
| Material Options | Chrome steel rings and rollers, ceramic coating, brass or steel cage options |
| Precision Grades | P0, P6, P5 or customized precision for motor and spindle applications |
| Clearance Options | C0, C3, C4 and custom internal clearance for temperature and fit conditions |
| Lubrication | Grease or oil lubrication; high-temperature and heavy-load options available |
| OEM Support | Series, size, cage, clearance, insulation level, lubrication, marking, packaging and documentation |
Key Features
- High radial load capacity – cylindrical roller geometry supports demanding motor, generator, railway, and heavy machinery applications.
- Electrical current protection – insulated ring design helps reduce current passage, fluting, pitting, arc marks, and lubricant degradation.
- Stable running accuracy – suitable for equipment requiring radial rigidity, consistent rotation, and reliable performance under heavy load.
- Multiple bearing configurations – NU, NJ, N, NUP and customized designs can be selected according to axial guidance and mounting needs.
- Heavy-duty cage options – brass, steel, and application-specific cage structures are available for speed, load, and temperature requirements.
- OEM customization support – size, clearance, precision, insulation level, lubrication, marking, packaging, and inspection standards can be matched to project needs.
Applications
Insulated Cylindrical Roller Bearings are used in heavy-duty rotating equipment where high radial load, stable operation, and electrical current protection are required. They are especially suitable for large industrial motors, machine tools, mining machinery, and railway traction systems.
Technical Resources
Whether you are an engineer, procurement manager, or equipment maintenance professional, here you will find in-depth content covering bearing operating principles, technical parameter interpretation, industry application analysis, and selection logic — helping you build a comprehensive understanding of bearing products and make more informed decisions in real-world applications.
FAQs
What are insulated cylindrical roller bearings used for?
They are used in large motors, generators, railway traction systems, machine tools, mining machinery, and heavy rotating equipment where high radial load and protection from electrical current damage are required.
How do I select an insulated cylindrical roller bearing?
Selection should consider bearing series, radial load, axial guidance requirement, speed, clearance, cage type, insulation position, lubrication, operating temperature, fit, and the severity of electrical current exposure.
Why choose cylindrical roller bearings for insulated applications?
Cylindrical roller bearings offer higher radial load capacity and rigidity than many ball bearing designs, making them suitable for large motors and heavy machinery where both load support and electrical protection are important.
Can insulated cylindrical roller bearings replace standard bearings?
Yes. Many insulated cylindrical roller bearings can be supplied with standard boundary dimensions, but the bearing configuration, clearance, cage, load rating, and mounting arrangement should be checked before replacement.
Which industries commonly use this bearing type?
Common industries include industrial motors, machine tools, mining machinery, railway traction systems, generators, compressors, and heavy industrial drive equipment.
Can ETM customize insulated cylindrical roller bearings?
Yes. ETM can support OEM requirements including bearing series, size, clearance, cage, insulation level, lubrication, precision grade, marking, packaging, and technical documentation.
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