NTN NU210EAT2X CYLINDRICAL ROLLER BEARING

Suitable for high radial loads and for use as a free or fixed bearing, cylindrical roller bearings feature low friction and good stiffness. They are available in a wide range of models and variants addressing specific conditions: heat, axial displacement, operating noise, speed, capacity, etc.

The NTN cylindrical roller bearings of the ULTAGE™ series are a benchmark solution for applications with high radial loads and sustained rotational speeds. The optimized internal design of this range offers increased load capacity within the same envelope as standard series, with extended maintenance intervals as a result.

Decoding:
- NU: single-row bearing with two shoulders on the outer ring and none on the inner ring; separable inner ring.
- EA: designates NTN's ULTAGE™ series; standard external dimensions retained, but internal specifications optimized (increased roller diameter, length and number).
- T2X: cage in glass fiber reinforced polyamide.

Features:
These NU-type bearings are built around an outer ring with two shoulders and no shoulder on the inner ring. This configuration allows separation of the outer ring–rollers–cage assembly from the inner ring, which simplifies mounting and disassembly. Axial displacement occurs by sliding on the seats, making these bearings a natural solution for free bearings.

The ULTAGE™ series retains the envelope dimensions of standard bearings while integrating larger-diameter rollers in greater numbers. The profile of the rollers' generatrix is optimized to limit stress concentrations at the ends of the contact. These internal improvements result in increased dynamic load capacity and an allowable speed improved by 20% compared with the standard when lubricated with oil. ULTAGE™ type rings are not interchangeable with standard series rings due to a different inscribed circle diameter.

The cage in glass fiber reinforced polyamide 66 offers good mechanical strength, heat resistance and low wear. This material also provides some flexibility during assembly, particularly useful on constrained geometries.

Maintenance:
Open bearing: lubrication (grease or oil) must be adapted to service conditions. The ULTAGE™ series benefits from extended relubrication intervals. Shaft/bore mounting tolerances must comply with NTN recommendations to maintain residual clearance within the allowable range. In operation, monitor temperature, vibration and noise. The permissible misalignment is 1/500 mm/mm.

Key advantages:
- Increased radial load capacity in the same envelope, without modifying existing bore dimensions.
- Separable inner ring, facilitating mounting and replacement without complete removal of the shaft.
- Free axial displacement absorbing thermal expansion without imposing stress on other assembly components.
- Extended maintenance intervals thanks to the technical improvements of the ULTAGE™ series.

Applications:
These NTN bearings are used as free bearings, paired with a fixed bearing (type NJ or NUP) to form a complete arrangement. They are suitable for industrial drives, long-shaft gearboxes, gearboxes, electric motors and pump-motor units, wherever the shaft is subject to thermal expansion or axial displacement. The robustness of the ULTAGE™ profile and the polyamide cage also make them relevant for equipment with variable loads or frequent starts.