This guide details eight key types of single-row cylindrical roller bearings — N, NU, NJ, NF, NUP, NFP, RN, and RNU—explaining their rib designs, axial load capabilities, and application suitability. Whether you need bidirectional axial movement support or heavy-duty rotational stability, this technical breakdown will guide your selection.
1. N-Type Cylindrical Roller Bearings
Key Features:
- Rib Configuration:
- Outer ring: No ribs.
- Inner ring: Ribs on both sides.
- Axial Load Capacity:
- Allows bidirectional shaft displacement relative to the bearing seat.
- Advantages:
- Optimized for high-speed applications like electric motors.
- Reduced friction for energy-efficient operation.
Applications: Precision machinery, pumps, and fans.
2. NU-Type Cylindrical Roller Bearings
Key Features:
- Rib Configuration:
- Outer ring: Ribs on both sides.
- Inner ring: No ribs.
- Axial Load Capacity:
- Supports bidirectional axial displacement.
- Advantages:
- Enhanced load distribution in conveyor systems.
- Simplified installation due to separable inner ring.
Applications: Automotive transmissions and conveyor rollers.
3. NJ-Type Cylindrical Roller Bearings
Key Features:
- Rib Configuration:
- Outer ring: Ribs on both sides.
- Inner ring: Ribs on one side (fixed), separable flat retainer on the other.
- Axial Load Capacity:
- Withstands unidirectional axial load.
- Advantages:
- Stable performance in vibratory screens.
- Cost-effective for directional load applications.
Applications: Mining equipment and agricultural machinery.
4. NF-Type Cylindrical Roller Bearings
Key Features:
- Rib Configuration:
- Outer ring: Ribs on one side.
- Inner ring: Ribs on both sides.
- Axial Load Capacity:
- Supports unidirectional axial load.
- Advantages:
- Compact design for limited spaces.
- High rigidity in precision industrial tools.
Applications: Machine tools and robotics.
5. NUP-Type Cylindrical Roller Bearings
Key Features:
- Rib Configuration:
- Outer ring: Ribs on both sides.
- Inner ring: Fixed rib on one side, separable flat retainer on the other.
- Axial Load Capacity:
- Allows bidirectional axial displacement with locking mechanisms.
- Advantages:
- Combines radial and axial load capacity.
- Ideal for adjustable speed drives.
Applications: Gearboxes and marine propulsion systems.
6. NFP-Type Cylindrical Roller Bearings
Key Features:
- Rib Configuration:
- Outer ring: Fixed rib on one side, separable flat retainer on the other.
- Inner ring: Ribs on both sides.
- Axial Load Capacity:
- Limited bidirectional axial movement.
- Advantages:
- Simplified maintenance with removable components.
- High-temperature resistance for continuous operation.
Applications: Steel mills and foundries.
7. RN-Type Cylindrical Roller Bearings
Key Features:
- Rib Configuration:
- No outer ring.
- Inner ring: Double ribs.
- Axial Load Capacity:
- Supports radial loads only.
- Advantages:
- Compact design for low-clearance installations.
- Optimized heat dissipation.
Applications: Electric motors and high-speed spindles.
8. RNU-Type Cylindrical Roller Bearings
Key Features:
- Rib Configuration:
- No inner ring.
- Outer ring: Double ribs.
- Axial Load Capacity:
- Radial load-focused design.
- Advantages:
- Reduced weight for lightweight machinery.
- Extended lifespan in high-cycle applications.
Applications: Aerospace components and robotics.
Conclusion: Matching Bearing Types to Applications
Selecting the right cylindrical roller bearing depends on rib configurations, axial load requirements, and operational demands. From the bidirectional NUP for gearboxes to the compact RN for electric motors, each type offers distinct advantages. For high-precision needs, the separable NFP ensures easy maintenance, while the rigid NJ excels in vibratory environments.