Single row full complement cylindrical roller bearings
The basic SKF assortment of single row full complement cylindrical roller bearings provided here includes NCF and NJG design bearings. They are used to locate the shaft axially in one direction and eventually to accommodate axial displacement of the shaft relative to the housing in the opposite direction.
NCF design bearings have two integral flanges on the inner ring and one on the outer ring (fig. 1). A retaining ring inserted in the outer ring on the side opposite the integral flange holds the bearing together. The retaining ring should not be loaded axially during operation.
NJG design bearings, which comprise the heavy 23 dimension series, are intended for very heavily loaded, slow-speed applications. These bearings have two integral flanges on the outer ring and one on the inner ring (fig. 2). NJG design bearings have a self-retaining roller complement. Therefore, the outer ring with the roller complement can be separated from the inner ring without having to take special precautions to prevent the rollers from falling out (fig. 3). This simplifies mounting and dismounting.
SKF can supply matched bearings. To match bearings, SKF combines bearings so that the difference in cross-section height lies within a very small tolerance range. This reduced tolerance range is a precondition for equal load sharing between the bearings.
Matched bearings are identified by a designation suffix:
- DR for a set of two bearings
- TR for a set of three bearings
- QR for a set of four bearings
For additional information, contact the SKF application engineering service.