FAG NJ316-E-XL-M1A-C4 CYLINDRICAL ROLLER BEARING

This FAG cylindrical roller bearing with radial clearance C4 has been designed for applications with large thermal expansions or very tight fits. The X-life design and the increased radial load 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 capacity
• XL: X-life designation for improved contact surfaces and extended service life
• M1A: Two-piece brass cage, flange-guided
• C4: Radial clearance greater 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 functioning as a floating (non-locating) bearing in the opposite direction. For applications requiring axial guidance in both directions, the bearing can be converted into a fixed bearing by fitting an HJ locating ring (not included). The radial clearance C4, which is larger than C3, prevents excessive internal preload with very tight fits or pronounced thermal load changes. 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 peak stresses and ensure a more uniform load distribution on the raceways. The split design facilitates assembly and maintenance operations. The inner ring can be mounted on the shaft independently, while the remaining bearing part is fitted separately into the housing.

Maintenance:
Monitoring vibration and noise is an important indicator of bearing condition. Unusual changes can indicate raceway damage or lubricant contamination. Bearing temperature should also be checked regularly. A temperature rise that cannot be explained by operating conditions often indicates lubrication issues or an inappropriate internal clearance. The C4 clearance offers increased tolerance to thermal expansions and tight fits. Nevertheless, during commissioning it should be verified whether the selected clearance matches the actual installation and temperature conditions. Lubrication can be performed with grease or oil depending on speed and temperature range. Relubrication intervals must be determined according to the 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 accessible during regular inspections. A visual inspection of the raceways and rollers allows early detection of fatigue signs, spalling or indentations before the bearing's function is impaired.

Strengths:
• The C4 internal clearance compensates for large thermal expansions and is suitable for very tight fits.
• The split inner ring reduces downtime during maintenance.
• The increased dynamic load capacity due to the X-life design can extend the nominal service life by more than 70%.

Applications:
FAG cylindrical roller bearings in C4 design are especially intended for areas with high or fluctuating operating temperatures and tight fits. In heavy industries, for example in the steel industry, foundries, paper mills or cement plants, such bearings are often used in gearboxes, rolling mills and rotating equipment exposed to strong temperature gradients. Industrial compressors and high-power drive systems are also typical applications. Cold starts and load changes there cause dimensional changes that are accommodated by the C4 clearance without creating 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 preserving the necessary freedom of movement for thermal expansions.