FAG NJ1022-XL-M1-C3 CYLINDRICAL ROLLER BEARING

FAG X-life cylindrical roller bearings combine a high radial load capacity with axial guidance in one direction in a separable design. The combination of a brass cage M1 and a radial internal clearance C3 enhances their suitability for applications with high thermal loads.

Explanation:
• NJ: single-row design, two flanges on the outer ring and one flange on the inner ring; high radial load capacity and accommodation of axial loads in one direction
• XL: FAG X-life quality designation; optimized contact surfaces, increased dynamic load rating and extended service life
• M1: two-piece brass cage, roller-guided; good heat dissipation and increased wear resistance
• C3: greater radial internal clearance than normal; compensates for tight fits and thermal expansions

Features:
The two-piece, roller-guided brass cage M1 distinguishes this bearing from versions with a standard cage. Brass provides improved heat dissipation and higher wear resistance, which are two decisive advantages at high speeds or continuously elevated operating temperatures. The NJ design enables axial locating of the shaft in one direction while allowing axial displacement in the opposite direction. The outer ring has two flanges, the inner ring one flange. The inner ring can be separated from the outer ring–roller–cage assembly. This design principle facilitates mounting on the shaft, including hot mounting by shrink fit, and allows uncomplicated replacement of individual components. Disassembly follows the same principle without the need to forcibly remove the complete bearing unit. In terms of performance, the X-life design offers on average an 18 % higher dynamic basic load rating and up to 70 % longer nominal service life compared to the standard version. This is achieved through more uniform contact surfaces and reduced friction.

Maintenance:
The X-life design in combination with the brass cage helps reduce internal heat generation and minimize contact wear between cage and rollers. As a result, maintenance and inspection intervals can be extended. However, as this is an open bearing, cleanliness and lubrication remain critical factors. The lubricant should be selected according to the actual operating conditions with regard to speed, load and temperature. Condition monitoring in operation is based on three key indicators: temperature, vibration level and running noise. An unusual rise in temperature can indicate problems with lubrication or internal clearance. The C3 internal clearance prevents excessive internal preload resulting from interference fits or thermal expansions in operation, but does not replace regular inspection.

Strengths:
• Brass cage M1: Improved heat dissipation and increased wear resistance for applications with high temperatures and speeds
• Separable inner ring: Hot mounting and disassembly can be performed without handling the complete bearing, reducing the risk of damage
• Extended service life through X-life: Significantly longer operating times under identical conditions
• Flexible adjustment of bearing configuration: By using an HJ angle ring a locating bearing can be converted into a fixed bearing without changing the bearing reference
• Internal clearance C3: Integrated protection against excessive preload in applications with fluctuating thermal conditions

Applications:
The brass cage M1 makes this bearing particularly suitable for applications with high thermal loads or continuously high speeds, for example in turbines, compressors, machine tool spindles or continuously operated geared motors. Compared with a stamped steel cage, brass better withstands prolonged temperature rises and is therefore especially suitable for hard-to-reach installations where long maintenance intervals are required. For gearboxes, drive systems and reversing shafts with high radial loads, the NJ geometry ensures the necessary axial positioning without restricting axial mobility in the opposite direction. The separable design facilitates on-site replacement, especially when complete disassembly of the shaft is not possible. This combination of features is also suitable for heavy-duty conveyor equipment, rolling mills and applications in the steel industry where thermal load peaks, high loads and high production speeds occur simultaneously.