NTN NU206EAT2X CYLINDRICAL ROLLER BEARING

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

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

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

Characteristics :
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, simplifying mounting and dismounting. Axial displacement occurs by sliding on the seating surfaces, making these bearings a natural solution for floating bearings.

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

The glass-fiber reinforced polyamide 66 cage offers good mechanical strength, heat resistance and low wear. This material also provides a degree of 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/housing mounting tolerances must comply with NTN recommendations to maintain the residual clearance within the admissible range. During operation, monitor temperature, vibrations and noise. Allowable misalignment is 1/500 mm/mm.

Key advantages :
- Increased radial load capacity within the same envelope, without modifying existing bore dimensions.
- Separable inner ring, facilitating installation and replacement without full removal of the shaft.
- Free axial displacement absorbing thermal expansions without stressing other assembly components.
- Extended maintenance intervals thanks to the technical improvements of the ULTAGE™ series.

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