Cylindrical Roller Bearings FAG NU218 -E-XL-TVP2

The NU design denotes a non-locating bearing in which the outer ring has two fixed flanges, whilst the inner ring has no flanges. This allows the inner ring to be removed from either side. During operation, the shaft can move axially within the bearing as a result of thermal expansion without causing any undue stresses.

The model is manufactured with standard radial bearing clearance. This standard clearance provides the necessary clearance between the rolling elements and raceways during operation, assuming standard fit selections and moderate operating temperatures. However, special installation conditions involving high heat generation or a very tight fit may, in some circumstances, require designs with increased bearing clearance.

The permissible operating temperature range is from -30 to +120 degrees. The upper temperature limit is primarily determined by the polyamide cage used. In the event of sustained thermal stresses exceeding 120 degrees, users should opt for alternative cage materials such as brass or sheet steel.

The bearing complies with tolerance class P0 or PN, which corresponds to class ABEC 1 in the Anglo-American region. This standard tolerance meets the usual requirements in general mechanical engineering and ensures dimensional interchangeability in accordance with ISO standards.

The outer ring is manufactured without a circumferential groove or lubrication bore, as the design is intended to be lubricated from the end face. In open cylindrical roller bearings, the lubricant reaches the cage and rollers directly via the housing or adjacent lubrication nozzles. This simplifies the bearing mounting in the housing.