NTN NUP208EAT2XU CYLINDRICAL ROLLER BEARING

Designed for high radial loads and for use as either floating or fixed bearings, cylindrical roller bearings offer low friction and good rigidity. They are available in a wide range of models and variants tailored to specific conditions: heat, axial displacement, operating noise, speed, capacity, etc.

This family of NTN cylindrical roller bearings combines an ULTAGE™ design, a NUP fixed-bearing architecture and a T2X polyamide cage. This combination increases load capacity and service life while retaining the external dimensions of a standard bearing.

Explanation:
- NUP : single-row cylindrical roller bearing with two ribs on the outer ring and one fixed rib combined with a removable rib fitted to the inner ring.
- EA : ULTAGE™ design with enhanced load capacity thanks to an increased number, diameter and length of rollers within a standard envelope.
- T2X : glass-fiber reinforced polyamide cage.
- U : NTN designation suffix associated with NUP-type bearings in this range.

Features :
The NUP architecture of these bearings allows them to carry substantial radial loads while ensuring axial retention of the shaft in both directions. This axial guidance capability makes these bearings a widely used solution as a fixed bearing in mechanical transmissions. Because the removable shoulder ring is separable, the inner ring must be axially secured during assembly.

The EA design from the ULTAGE™ range complements this architecture by increasing the diameter, length and number of rollers without changing the external dimensions of the bearing. This optimization increases load capacity while maintaining the same overall envelope as a standard bearing. The combination of large-diameter rollers, optimized generating line profile and the ULTAGE™ internal geometry also helps extend operating life while improving permissible speeds.

The T2X glass-fiber reinforced polyamide cage contributes to these performance goals. Its low mass reduces inertial forces on the rolling elements while its wear resistance and sliding properties limit abrasion at the roller guidance. The moderate moisture absorption of the material increases its flexibility and resilience, which improves impact resistance and eases assembly. This design also helps reduce noise levels compared with some metal cages.

Maintenance :
Maintaining the performance of these bearings relies on appropriate lubrication. The choice of lubricant should take into account operating temperature, rotational speed, applied loads and the operating environment. It should also consider the composition of additives used to ensure their compatibility with the polyamide cage. In particular, attention should be paid to oils containing extreme-pressure additives based on sulfur or phosphorus, which can alter the material properties at elevated temperatures.

Maintenance operations include monitoring noise, vibrations, operating temperature and lubricant condition. Abnormal changes in these parameters may indicate lubrication failure, contamination or an alignment problem.

Particular attention should be paid to the operating temperature, which should remain between -20 °C and 120 °C. During inspections, it is recommended to check the condition of the glass-fiber reinforced polyamide cage, whose mechanical properties can change after prolonged exposure to high temperatures, humidity or certain incompatible lubricants.

Key advantages :
- Ensures axial retention of the shaft in both directions within a fixed bearing.
- Carries high radial loads without increasing external envelope.
- Enables compact assemblies through the reinforced ULTAGE™ design.
- Facilitates assembly thanks to its separable design.
- Helps reduce noise and wear related to roller guidance.
- Suitable for high-speed mechanisms when lubrication conditions are appropriate.

Applications :
These cylindrical roller bearings are primarily used as fixed bearings in industrial transmissions and reducer shafts. Their ability to axially retain the shaft in both directions allows control of its position while supporting significant radial loads.

Common application areas include industrial gearboxes, geared motors, conveyors, handling equipment and various mechanical transmissions. The enhanced load capacity provided by the ULTAGE™ design enables transmission of high forces in assemblies where available space is limited.

These bearings are also suitable for high-speed machines when component alignment is properly controlled and lubrication conditions are compatible with the characteristics of the polyamide cage. Because the allowable misalignment is limited, these bearings are intended for installations where shaft and housing alignment is well managed.