FAG NJ2207-E-XL-M1A-C4 0382596560040 CYLINDRICAL ROLLER BEARINGS

This FAG cylindrical roller bearing with radial internal clearance C4 has been developed for applications with large thermal expansions or very tight fits. The X-life design and the increased radial load-carrying capacity make it a suitable solution for demanding heavy-duty applications.

Explanation:
• NJ: Single-row bearing with two ribs on the outer ring and one rib on the inner ring
• E: Optimized internal geometry for increased radial load-carrying capacity
• XL: X-life marking for improved contact surfaces and longer service life
• M1A: Two-piece brass cage, flange-guided
• C4: Radial internal clearance larger than C3, suitable for large thermal expansions and very tight fits

Features:
The combination of an outer ring with two ribs and an inner ring with one rib defines the NJ design. It provides reliable axial guidance in one direction while allowing use as a floating bearing in the opposite direction. For applications requiring axial location in both directions, the bearing can be converted to a fixed bearing by installing an HJ locating ring (not included). The C4 radial clearance, which is larger than C3, prevents excessive internal preload with very tight fits or pronounced thermal load cycles. The two-piece, flange-guided brass cage M1A stabilizes the rolling elements and supports heat dissipation during operation. The contact surfaces optimized by X-life manufacturing technology reduce stress peaks and ensure a more even load distribution on the raceways. The separable design facilitates assembly and maintenance tasks. The inner ring can be mounted independently on the shaft while the remaining bearing part is inserted separately into the housing.

Maintenance:
Monitoring of vibrations and noise levels is an important indicator of bearing condition. Unusual changes can indicate raceway damage or contamination of the lubricant. Bearing temperature should also be checked regularly. A temperature rise that cannot be explained by operating conditions often indicates lubrication problems or unsuitable internal clearance. The C4 clearance provides increased tolerance to thermal expansions and tight fits. Nevertheless, during commissioning it should be verified whether the selected internal clearance corresponds to the actual assembly and temperature conditions. Lubrication can be effected with grease or oil depending on speed and temperature range. Re-lubrication intervals must be determined according to actual loads and operating conditions. As this bearing is of open design, appropriate measures to protect against dust and abrasive particles must be taken during all maintenance work. Because the inner ring is separable, the rolling elements are more easily accessible during regular inspections. A visual inspection of the raceways and rollers enables early detection of fatigue signs, spalling or indentations before the bearing function is impaired.

Strengths:
• The C4 internal clearance compensates for large thermal expansions and is suitable for very tight fits.
• The separability of the inner ring reduces downtime during maintenance.
• The increased dynamic load capacity provided by the X-life design enables an extension of the nominal service life by more than 70%.

Applications:
FAG cylindrical roller bearings in C4 design are particularly intended for service in environments with high or fluctuating operating temperatures and tight fits. In heavy industry, for example in the steel industry, foundries, paper mills or cement works, such bearings are commonly used in gearboxes, rolling mills and rotating installations exposed to strong temperature gradients. Industrial compressors and high-power drive systems are also typical application areas. Cold starts and load changes there cause dimensional changes that are accommodated by the C4 clearance without generating excessive preload. The brass cage M1A and X-life technology ensure consistently high performance even under recurring thermal loads. In mechanical drive trains and gearboxes of large machines, the NJ design provides reliable axial guidance of the shaft in one direction while retaining the freedom of movement required for thermal expansions.