FAG NU312-E-XL-M1-C4 0167399490040 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 allowing axial shaft compensation 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 press fits and applications with significant thermal expansion

Features:
The NU design enables a separable inner ring. This can remain on the shaft during disassembly while the outer ring, rollers and cage remain in the housing. This simplifies maintenance and disassembly work since complex bearing pull-off is not required every time the shaft is removed.
The E design features optimized contact profiles that distribute loads more evenly and thereby increase radial load capacity at the same mounting dimensions. X-life technology goes a step further: refined raceway surfaces reduce friction and heat generation. Under identical operating conditions, this significantly extends bearing life.
The M1 brass cage is assembled by hot riveting and is guided on the rollers. It retains its mechanical properties even at high temperatures. The increased C4 radial clearance compensates for large thermal expansions as well as tight fits that could reduce the operating internal clearance in service.

Maintenance:
As an open rolling bearing without integrated seals, lubricant selection, lubricant quantity and maintenance intervals are critical for operational safety. Over-lubrication increases the operating temperature due to churning action, while insufficient lubrication accelerates wear. For high-temperature applications, greases based on synthetic oils or complex soap greases are recommended.
Operating temperature is the most important monitoring parameter. Unusual vibrations or noises such as knocking, whistling or irregular running sounds require immediate inspection. Before assembly, rolling elements and raceways should be carefully cleaned to avoid contamination. Thanks to the separable inner ring, rollers, cage and raceways can be inspected individually. If there are signs of pitting, spalling or deformation, 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 stressing in operation and increases operational reliability under large temperature gradients
• Reduced friction minimizes internal heating and relieves the lubricant

Applications:
As a floating (non-locating) bearing, this FAG cylindrical roller bearing is suitable for applications with predominantly radial loads where temperature-induced changes in shaft length must be compensated. 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 C4 radial clearance and the M1 brass cage are specifically designed for high operating temperatures and tight fits on large-diameter shafts. Typical application areas are found in the steel industry, cement industry and chemical industry, for example in rolling mills, rotary kilns, industrial fans, crushers, extruders and mixers.