Other variants

Bearings without an inner or outer ring

SKF can supply NU design cylindrical roller bearings without an inner ring (RNU series, fig. 1) and N design bearings without an outer ring (RN series, fig. 2). These bearings are typically used in applications where hardened and ground raceways are provided on the shaft or in the housing (→ Raceways on shafts and in housings). Because RNU bearings do not have an inner ring, the shaft diameter can be larger to provide a stronger, more rigid bearing arrangement. Additionally, the possible axial displacement of the shaft relative to the housing is limited only by the width of the raceway on the shaft for RNU bearings, or in the housing for RN bearings.

Certain sizes of cylindrical roller bearings in the RNU series are listed in the product table. The inside diameter Fw of the roller complement of bearings in the RNU series, when the rollers are in contact with the outer ring raceway, lies within the limits of tolerance F6Ⓔ.

Bearings with a tapered bore

Some single row cylindrical roller bearings can be supplied with a 1:12 tapered bore (designation suffix K, fig. 3). Bearings with a tapered bore have radial internal clearance greater than corresponding bearings with a cylindrical bore. For additional information, refer to the product table or contact the SKF application engineering service. Check availability prior to ordering.

Bearings with a snap ring groove

Single row cylindrical roller bearings can be supplied with a snap ring groove in the outer ring (designation suffix N, fig. 4). These bearings can be axially located in the housing by a snap ring to save space and reduce mounting time. Check availability prior to ordering.

Bearings with locating slots

When the outer ring must be mounted with a loose fit, bearings with locating slots can be used to prevent the outer ring from turning. Single row cylindrical roller bearings can be supplied with one or two locating slots (designation suffix N1 or N2) in the outer ring (fig. 5). The two locating slots are positioned 180° apart. For additional information, refer to the product table or contact the SKF application engineering service. Check availability prior to ordering.
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