FAG NU311-E-XL-M1-C4 0167399060040 CYLINDRICAL ROLLER BEARINGS

This FAG cylindrical roller bearing offers high radial load capacity with standardized dimensions. It allows free axial compensation of the shaft and is designed for use at elevated operating temperatures.

Explanation:
• NU: Outer ring with two flanges, inner ring without flange; floating bearing design for axial shaft displacement in both directions
• E: Optimized internal geometry for higher radial load capacity compared with the standard design
• XL: X-life technology; improved surface quality, up to 18 % higher dynamic load ratings and more than 70 % longer nominal service life
• M1: Two-piece brass cage, hot-riveted and roller-guided
• C4: Increased radial clearance above C3 level; suitable for interference fits and applications with significant thermal expansion

Features:
The NU design allows a separable inner ring. This can remain on the shaft during disassembly while the outer ring, rollers and cage stay in the housing. This simplifies maintenance and disassembly work, as removal of the shaft does not require an elaborate bearing-pulling procedure each time.
The E design features optimized contact profiles that distribute loads more evenly and thus increase radial load capacity with identical installation dimensions. X-life technology goes a step further: refined raceway surface finishes reduce friction and heat generation. Under identical operating conditions, this significantly extends bearing life.
The M1 brass cage is assembled by hot riveting and guided on the rollers. It retains its mechanical properties even at high temperatures. The increased radial clearance C4 compensates for large thermal expansions as well as tight fits that could reduce running clearance in operation.

Maintenance:
As an open rolling bearing without integrated seals, the choice of lubricant, the quantity of lubricant and the maintenance intervals are critical to operational reliability. Over-greasing increases operating temperature due to churning, while insufficient lubrication accelerates wear. For high-temperature applications, greases based on synthetic oils or with complex soaps are recommended.
Operating temperature is the most important monitoring parameter. Unusual vibrations or noises such as knocking, whistling or irregular running noises require immediate inspection. Prior to assembly, rolling elements and raceways should be thoroughly cleaned to avoid contamination. Thanks to the separable inner ring, rollers, cage and raceways can be inspected individually. If signs of pitting, spalling or deformation are present, the bearing must be replaced.

Strengths:
• Separable inner ring reduces maintenance effort and downtime
• X-life technology extends bearing life and increases maintenance intervals
• M1 brass cage offers high temperature resistance in applications where polymer cages reach their limits
• C4 radial clearance prevents excessive stresses in operation and increases operational safety under strong temperature gradients
• Reduced friction minimizes internal heating and relieves the lubricant

Applications:
As a floating bearing, this FAG cylindrical roller bearing is suitable for applications with predominantly radial loads where temperature-induced shaft length changes must be accommodated. In medium and high power electric motors it is often used on the non-locating side in combination with a fixed bearing. The same applies to industrial gearboxes, centrifugal pumps and compressors.
The increased radial clearance C4 and the M1 brass cage are specifically designed for high operating temperatures and tight fits on large-diameter shafts. Typical application areas include the steel industry, cement industry and chemical industry, for example in rolling mills, rotary kilns, industrial fans, crushers, extruders and mixing plants.