FAG NJ1007-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 improves 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 forces in one direction
• XL: FAG X-life quality designation; optimized contact surfaces, increased basic 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 interference 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 allows axial positioning of the shaft in one direction while permitting axial movement 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 straightforward replacement of individual components. Disassembly follows the same principle, without having to forcibly remove the complete bearing unit. In terms of performance, the X-life version offers on average an 18% higher basic dynamic load rating and up to 70% longer nominal service life compared with the standard version. This is achieved by more uniform contact surfaces and reduced friction.

Maintenance:
The X-life design combined 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 actual operating conditions in terms of speed, load and temperature. Condition monitoring during operation is based on three essential indicators: temperature, vibration level and running noise. An unusual rise in temperature can indicate problems with lubrication or internal clearance. The C3 clearance prevents excessive internal preload due to interference fits or thermal expansions during 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 adaptation of bearing configuration: By using an HJ angle ring a locating bearing can be converted into a fixed bearing without changing the bearing reference
• Radial clearance C3: Integrated protection against excessive preload in applications with varying 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 tolerates prolonged temperature increases better and is therefore especially suitable for hard-to-access installations where long maintenance intervals are required. For gearboxes, drive systems and redirecting shafts with high radial loads, the NJ geometry ensures the necessary axial positioning without restricting axial mobility in the opposite direction. The separable design simplifies on-site replacement, particularly when complete disassembly of the shaft is not possible. This combination of features is also suitable for heavy-duty conveying equipment, rolling mills and applications in the steel industry where thermal load peaks, heavy loads and high production speeds occur simultaneously.