Typical Materials:
Inner Ring
Outer Ring
Cylindrical Rollers (Rolling Elements)
Cage (Retainer)
Flanges (Integrated in Ring Design)
Surface Treatments (Optional Enhancements)
Yes, Cylindrical Roller Bearings are available in both sealed and unsealed (open) designs, depending on application requirements, lubrication strategy, and operating environment.
Structural Characteristics
No integrated sealing components
Exposed rolling elements
Designed for oil or grease lubrication via external system
Performance Advantages
Higher permissible speed
Better heat dissipation
Suitable for oil circulation systems
Easier inspection and relubrication
Typical Applications
Industrial gearboxes
Large electric motors
Wind turbine gear systems
Machine tool spindles
Heavy transmission systems
Business Consideration
Open-type bearings are preferred when:
The housing already provides sealing
Continuous lubrication systems are used
High-speed performance is required
Structural Characteristics
Integrated contact or non-contact seals on one or both sides
Pre-filled with grease
Designed as maintenance-reduced or maintenance-free units
Seal Types
Rubber contact seals (2RS type)
Non-contact labyrinth seals
Metal shields (ZZ type)
Performance Advantages
Protection against dust and contaminants
Reduced grease leakage
Lower maintenance frequency
Improved reliability in harsh environments
Typical Applications
Agricultural machinery
Construction equipment
Conveyor systems
Pumps and compressors
Medium-duty industrial equipment
Business Consideration
Sealed versions are preferred when:
The operating environment is dusty or contaminated
Maintenance access is limited
Grease lubrication is sufficient
Moderate speed is acceptable
Select grease with appropriate base oil viscosity (typically ISO VG 100–220 for general industrial use)
Lithium-based grease is standard
For high temperature: Polyurea or synthetic grease
Avoid overfilling (30–50% internal free space recommended)
Electric Motors
→ Grease lubrication (Polyurea for long life)
Heavy Gearboxes
→ Oil bath or oil circulation
Wind Turbines
→ Oil circulation with filtration
Machine Tools
→ Oil-air lubrication
Pumps & Compressors
→ Grease (moderate duty) or oil (high duty)
Cylindrical roller bearing specifications primarily conform to ISO 15 standards, covering single-row (NU, NJ, NUP, N), double-row (NNU, NN), and four-row series. Core parameters include inner diameter (d), outer diameter (D), width (B), dynamic load (C), static load (Co), and limiting speed. These bearings feature high radial load capacity, and some designs allow for a certain degree of axial displacement or can withstand minor axial loads.
| Bearing model series | inner diameterd(mm) | outer diameterD(mm) | widthB(mm) | Main features |
| NU/NJ 200 | 10 – 100+ | 30 – 200+ | 9 – 40+ | Light-duty series, high speed |
| NU/NJ 300 | 10 – 100+ | 35 – 250+ | 11 – 50+ | Medium series, high radial load |
| NU/NJ 2200 | 20 – 100+ | 47 – 215+ | 14 – 58+ | Wide-width, lightweight, high-rigidity |
| NNU / NN | Specific query required | Specific query required | Specific query required | Double-row, high-precision machine tool spindle |
The above data are typical industry parameters. Please consult us for detailed dimensions and rated loads for specific models.
High Load Capacity
Cylindrical roller bearings feature line contact between rolling elements and raceways, which allows them to support very high radial loads compared to ball bearings of similar size. This makes them ideal for heavy-duty machinery.
Low Friction and High Efficiency
The rollers reduce friction and heat generation, ensuring smooth operation and high mechanical efficiency, which is essential for equipment requiring continuous or high-speed operation.
Rigidity and Precision
These bearings provide excellent rigidity, maintaining shaft alignment under heavy radial loads. Their design also allows for high-precision positioning, which is critical in machine tools, motors, and precision equipment.
Accommodates Axial Displacement
Certain cylindrical roller bearing designs, especially single-row or double-row with floating capability, can accommodate axial displacement of the shaft, reducing stress on other components.
Durable and Long Service Life
Made with high-quality steel and advanced manufacturing processes, these bearings offer exceptional wear resistance and long operational life, minimizing maintenance frequency.
Versatile Design Options
Available in single-row, double-row, or multi-row designs, they can be tailored for different load capacities, speeds, and installation requirements, offering flexibility for various applications.
VKUKEN has over 30 years of experience in bearing design and manufacturing. We can customize non-standard bearings according to customer drawings, or we can measure and create drawings of existing bearings on-site and then manufacture custom bearings based on those drawings. Our team of professional engineers has over 20 years of experience in bearing design and measurement.
We have found that many people would like to learn about the application technology and selection of Bearing but do not have suitable materials to read. Our team of engineers constantly exports technology on our download page and blog, which you can download for free.
Hi, I am Maxwell, I am an engineer in the field of bearing applications. I majored in mechanical and electromechanical engineering during college. After graduation, I worked for the top three "SKF" bearing companies in the world for ten years , during which I went to dozens of customers in different industries to help them solve problems in bearing applications; later I joined VKUKEN Bearing Manufacturing, and I will share bearing technical knowledge on this website from time to time. If you are a customer Please contact me to help you solve your problem; if you are also a technical expert in bearings, I am very willing to exchange technical knowledge about bearings with you.
