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Cylindrical roller bearings
Contents

Cylindrical roller bearings
Three different designs
Double row cylindrical roller bearings
Single row cylindrical roller bearings
Hybrid cylindrical roller bearings
General bearing data
Radial internal clearance
Preload
Equivalent dynamic bearing load
Equivalent static bearing load
Designation of high-precision cylindrical
roller bearings
Supplementary designations – specific suffixes
Product tables
High-precision double row cylindrical roller bearings
High-precision single row cylindrical roller bearings
Hybrid high-precision single row cylindrical
roller bearings

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3 Cylindrical roller bearings

Cylindrical roller bearings
Three different designs
SKF high-precision cylindrical roller
bearings are available in three different
designs: two double row series NN 30 and
NNU 49 and a high-speed design, single
row cylindrical roller bearing series N 10.
NNU 49 series offer especially compact
dimensions and may be preferred when

limited room is available. The NN 30 series
offers an optimum compromise between
achievable speed and high rigidity and
represents one of the more popular
choices, particularly for the spindles rearside support. Whenever demand for
rotational speed exceeds the standard
series capability, then the single row
series N 10 may be the solution.

Double row cylindrical
roller bearings
SKF high-precision double row cylindrical
roller bearings are available in two different
designs: NN (➔ fig 1 ) and NNU (➔ fig 2 )
designs, and two series: Dimension Series
30 and 49 (➔ fig 3 ).
The rollers of NN design bearings are
guided between integral flanges on the
inner ring, while rollers of NNU design
bearings are guided between integral
flanges on the outer ring. The other ring
has no flanges. This means that a certain
amount of axial displacement of the shaft
with respect to the housing in both directions
can be accommodated within the bearing
(see dimension ‘s’ in the product tables).
These bearings are also separable, and
the bearing ring with integral flanges,
together with the roller and cage assembly,
can be withdrawn from the flangeless ring.
This facilitates mounting and dismounting.

Double row highprecision cylindrical
roller bearing, NNU
design

Double row highprecision cylindrical
roller bearing, NN
design
Fig

1

Fig

The NN design bearings listed in this
catalogue follow ISO Dimension Series 30,
whereas the NNU design bearings follow
ISO ...
179
Cylindrical roller bearings
Cylindrical roller bearings 180
Three different designs 180
Double row cylindrical roller bearings 181
Single row cylindrical roller bearings 182
Hybrid cylindrical roller bearings 183
General bearing data 184
Radial internal clearance 188
Preload 189
Equivalent dynamic bearing load 192
Equivalent static bearing load 192
Designation of high-precision cylindrical
roller bearings 193
Supplementary designations – specific suffixes 193
Product tables 195
High-precision double row cylindrical roller bearings 196
High-precision single row cylindrical roller bearings 204
Hybrid high-precision single row cylindrical
roller bearings 208
Contents
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