The cylindrical roller bearings joined by several rows are mainly used in small rolling mills in the cold rolling efforts very important, but the speeds limited. They are also used in machines to recover and Shearing and extruders. For effective lubrication, these bearings have holes lubrication, or annular groove and lubrication holes in the outer ring.

The type of roller bearings SKF cylindrical joined several rows is the most common type NNU described below. On special order, the book also SKF bearings five rows of types NNCL and NNC. However, because of the quantity of designs and sizes available, the types NNCL NNC and are not listed in the tables bearings. Further details can be provided upon request.

Type NNU
These bearings have two rings free shoulder on the outer ring, an inner ring without shoulder and four or eight rows of rollers. They are removable and admit a certain axial displacement of the tree compared to the level in both directions.

Type NNCL
These bearings have four to six shoulders fixed on the inner ring and an outer ring segments shoulder without stopping on both sides of the path of the outer ring used to maintain the rotation. A certain axial displacement of the tree in relation to the bearing is tolerated in both directions.

Type NNC
These bearings have four to six shoulders fixed on the inner ring and a shoulder fixed and a free ring shoulder on the outer ring which holds the rotating basis. These bearings can guide a tree axially in both directions.

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