NTN NJ2211EAT2X CYLINDRICAL ROLLER BEARING

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

The NTN NJ.EA.T2X series combines cylindrical rollers, an optimized ULTAGE™ geometry and a polyamide cage. This design meets the needs of mechanisms subjected to high radial loads and high rotational speeds.

Breakdown:
• NJ: single-row cylindrical roller bearing with two shoulders on the outer ring and one shoulder on the inner ring; separable design + axial location in one direction
• EA: compact ULTAGE™ design with enhanced load capacity thanks to internal optimization of the rollers and raceways
• T2X: reinforced polyamide cage offering light weight and strength

Features:
The line contact between the rollers and the raceways (cylindrical rollers) enables support of high radial loads while maintaining good high-speed capability. The NJ configuration pairs two shoulders on the outer ring with one shoulder on the inner ring. This arrangement provides axial guidance of the shaft in a single direction and allows accommodation of a moderate axial load in that direction.

The separable design simplifies assembly and disassembly operations, especially when tight fits are required. The rings can be mounted independently on the shaft and in the housing.

The EA version is based on NTN's ULTAGE™ technology. Optimization of roller diameter, length and number increases load capacity while retaining standard envelope dimensions. This improvement can extend maintenance intervals and offers better high-speed performance.

The T2X polyamide cage is robust and withstands high temperatures. Its low mass reduces internal forces during rotation.

Maintenance:
This cylindrical roller bearing requires lubrication appropriate to the operating conditions to limit wear on the raceways and rollers. The polyamide cage conditions the choice of lubricant: oils containing sulfur- or phosphorus-based extreme-pressure additives may accelerate material degradation at elevated temperature.

Regular monitoring of lubricant condition, vibration, operating noise and temperature helps detect signs of premature wear. During maintenance operations, external surfaces should be kept clean to prevent contaminants from entering the bearing.

Key benefits:
• Handles high radial loads
• Ensures axial retention of the shaft in one direction
• Facilitates mounting and dismounting (separable design)
• Enables compact assemblies thanks to ULTAGE™ internal optimizations
• Improves wear and heat resistance thanks to the reinforced polyamide cage

Applications:
This type of bearing is primarily used in applications requiring both high radial load capacity and axial retention in a single direction.

Common applications:
• gearboxes and reducers;
• mechanical transmissions and power transmission systems;
• assemblies with shafts requiring unidirectional axial guidance;
• motors, conveyors and production equipment;
• other rotating machinery operating at high speed.

When axial guidance must be provided in both directions, two NJ bearings can be mounted as a pair to meet the application's requirements.