NTN - Large Bearings

Cylindrical Roller Bearings
1. Structure and Characteristics
Since the rollers of the cylindrical roller bearings make line
contact with the raceways, these bearings can support heavy
radial loads and are suitable for high speed operation.
Assembly and disassembly are comparatively easy even if
the inner or outer ring requires a shrink fit, as the bearing is a
separation type.
Cylindrical roller bearings are classified as single row,
double row and four row type, according to how many rollers
are used, and there are models as shown in Table 1 to 3.
Although designed as a thin wall type, the SL Model
double row cylindrical roller bearing can support enormous
radial and impact loads. Table 4 lists the configurations
available.
Table 1 Model and characteristics of the single row cylindrical roller bearings
Model code Drawing Characteristics
Model NU
Model N
Model NU
¡Model NU has ribs on the outer ring and the inner ring can be separated from "the
arranged set of outer ring, rollers and cage". Model N has ribs on the inner ring and the
outer ring can be separated from "the arranged set of inner ring, rollers and cage".
¡This bearing cannot support axial loads.
¡The most suitable model widely used as the free end bearing.
Model N
Model NJ
Model NF
Model NJ
Model NF
¡Model NJ has ribs on the outer ring and a rib on the inner ring.
Model NF has a rib on the outer ring and ribs on the inner ring.
¡These bearings support axial loads in one direction only.
¡There may be a case to use two bearings adjacent when they are used regardless of the
fixed end or free end.
Model NUP
Model NH
(NJ+HJ)
Model NUP
¡Model NUP has a rib ring added on the side of the inner ring where it did not have a rib.
Model NJ with the added ring rib of Model L is Model NH. The inner ring should be fixed
along the axial direction since each ring rib will be separated.
¡These bearings support axial loads in either direction.
¡There may be a case to use as the fixed end bearing.
Model NH
Note: Model E provides higher load capacity designed with increased diameter,length and numbers of rollers but the boundary dimensions are same as the
standard type bearings.
Table 2 Model and characteristics of the double row cylindrical roller bearings
Model code Drawing Characteristics
Model NNU
Model NN
Model NNU
Cylindrical hole Tapered hole
¡These bearings are used in the main shaft of machine tools, rolling mill rolls and printing
machine plate cylinders where thin walled bearings are needed.
¡To use the bearing in the main shaft of machine tools, adjust the radial internal clearance
by inserting a tapered inner ring to the tapered shaft.
Model NN
Cylindrical hole Tapered hole
B-37