NTN NJ308EAT2X CYLINDRICAL ROLLER BEARING

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

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

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

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

The separable design facilitates assembly and disassembly operations, particularly 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 the roller diameter, length and number increases load capacity while retaining standard limit dimensions. This development allows for extended maintenance intervals and offers improved high-speed performance.

The T2X polyamide cage is robust and resists high temperatures. Its low weight limits internal forces during rotation.

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

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

Key advantages :
• Supports high radial loads
• Provides axial retention of the shaft in one direction
• Facilitates assembly and disassembly (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 mechanisms operating at high speed.

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