Products
Cylindrical Roller Bearings
Product Overview
Cylindrical Roller Bearings are a high-capacity radial bearing type featuring cylindrical rollers in line contact with the inner and outer ring raceways, rather than the point contact found in ball bearings. This line contact distributes load over a larger surface area, enabling the series to support substantially higher radial loads than deep groove ball bearings of equivalent size, while maintaining good speed capability.
Available in multiple configurations — including N, NU, NJ, NUP, and NN types, differentiated by the presence and arrangement of ring flanges — the series can be selected based on required axial guidance and load capacity. NU and N types are essentially axial-load-free, while NJ and NUP types provide limited unidirectional or bidirectional axial location through flange design. Most types feature a separable inner and outer ring, simplifying mounting on interference-fit shafts. Precision grades range from P0 (standard) to P4 (high precision), and cage materials include steel stamped, machined brass, and polyamide.
Technical Specifications
| Series | N, NU, NJ, NUP, NN Series |
| Bore Diameter Range | 8mm – 500mm |
| Outer Diameter Range | 22mm – 870mm |
| Width Range | 7mm – 200mm |
| Cage Material Options | Steel stamped, brass machined, polyamide PA66 |
| Flange Configuration Options | N/NU (no axial guidance), NJ (single-direction), NUP (bidirectional) |
| Precision Grades | P0 standard, P6, P5, P4 high precision |
| Radial Clearance | CN normal, C3, C4 increased |
| Material Standard | Gcr15 / 52100 chrome steel, stainless steel SS440 / SS420 |
| Temperature Range | -40°C to +150°C standard, up to +200°C high temperature |
| Lubrication | Grease standard, oil optional, circulating oil for high-speed/heavy-load |
| Standards Met | ISO 9001, ISO 9001, IATF 16949, ISO 15, DIN 5412, JIS |
Key Features
- High radial load capacity — line contact between rollers and raceways supports significantly greater radial loads than ball bearings of the same envelope size
- Separable design — independent inner/outer ring mounting simplifies installation and facilitates axial free-floating support arrangements
- Multiple flange configurations — N/NU (no axial guidance), NJ (single-direction location), NUP (bidirectional location via separate locating ring)
- Good high-speed capability — relatively low friction compared to other roller bearing types, suitable for moderate-to-high speed operation
- Compatible with grease and oil lubrication, including circulating oil systems for heavy-load, continuous-duty applications
- Compliant with international standards, including ISO 15, DIN 5412, and JIS
Applications
Cylindrical Roller Bearings are widely used in industrial gearboxes and electric motors, where they support the heavy radial loads generated under continuous operation, often paired with a separate locating bearing to manage axial positioning.
In machine tool spindles, the series provides the high radial rigidity required for precision metal cutting, frequently combined with angular contact bearings to handle axial loads.
In rolling mills and metal processing equipment, Cylindrical Roller Bearings support heavy roll-neck loads under demanding, high-load operating conditions.
The series is also widely applied in railway axle boxes, large electric motors and generators, paper mill machinery, and wind turbine gearboxes, wherever high radial load capacity combined with reliable axial free-floating support is required.
Electric Tools
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Automotive
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Machine Tools
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Agriculture Machinery
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Food and Beverage
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Robotics
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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.
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FAQs
What loads can deep groove ball bearings handle?
Deep groove ball bearings are primarily designed for radial loads, but they can also handle moderate axial (thrust) loads in both directions. They are not suitable for heavy axial loads or combined shock loads. In those cases, angular contact or tapered roller bearings are preferred.
How do I select the right bearing size for my application?
Selection should be based on bore diameter (shaft size), required load capacity (dynamic rating C and static rating C0), operating speed compared with the bearing limiting speed, available space (outer diameter and width), and required precision grade from P0 to P2. Always apply a safety factor and verify that the calculated L10 service life meets your requirements.
What is the difference between open, shielded (ZZ), and sealed (2RS) bearings?
Open: No built-in protection, requires external sealing, and is suitable for clean environments or oil bath lubrication.
ZZ metal shields: Protect against dust and debris with low friction, making them suitable for high-speed applications, but they are not waterproof.
2RS rubber seals: Provide strong protection against dust and moisture. They are pre-greased and ideal for contaminated environments, but generate slightly more friction.
How often should I lubricate or replace the grease?
For general industrial use, grease should be replenished or replaced every 3,000 to 10,000 operating hours depending on speed, temperature, and environmental conditions. Bearings running above 70 C or in contaminated environments require shorter intervals. Sealed 2RS bearings are pre-greased for life and do not require re-lubrication.
What are the common causes of premature bearing failure?
The most frequent causes include inadequate or improper lubrication, contamination by dirt, dust, or moisture, incorrect installation, misalignment, excessive force during fitting, overloading beyond the rated capacity, improper shaft or housing fits, and fatigue at the end of normal service life.
How is the rated service life (L10) of a bearing calculated?
The basic L10 life is calculated as L10 = (C / P)^3 x 10^6 revolutions, where C is the dynamic load rating in kN and P is the equivalent dynamic bearing load in kN. It represents the number of revolutions that 90% of identical bearings will complete without fatigue failure. In practice, ISO 281 modified life calculations also apply correction factors for lubrication, contamination, material, and reliability.
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