NTN NJ208EAT2X CYLINDRICAL ROLLER BEARING

Adapted to high radial loads and for use in free or fixed bearing arrangements, cylindrical roller bearings feature low friction and good rigidity. They are available in a wide range of designs and variants tailored to specific contexts: 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 subjected 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) enables support of high radial loads while maintaining good suitability for high speeds. The NJ configuration combines two shoulders on the outer ring and one shoulder on the inner ring. This architecture provides axial guidance of the shaft in a single direction and allows the accommodation of a moderate axial load in that direction.

The separable design facilitates 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 the diameter, length and number of rollers increases load capacity while retaining standard limit dimensions. This evolution allows extending maintenance intervals and offers improved suitability for high speeds.

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

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

Regular monitoring of the lubricant condition, vibrations, operating noise and temperature makes it possible to detect signs of premature 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 mounting and dismounting (separable design)
• Enables compact assemblies thanks to internal ULTAGE™ optimizations
• Improves wear and heat resistance thanks to the reinforced polyamide cage

Applications :
This type of bearing is mainly 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.