SKF Cylindrical roller bearing caged Double row Series: NNU

Product description
High-precision double row cylindrical roller bearings are produced by SKF as standard in the NN design and NNU design. These bearings can accommodate axial displacement of the shaft relative to the housing in both directions, within the bearing. They are separable, i.e. the bearing ring with integral flanges, together with the
roller and cage assembly can be separated from the flangeless ring, to facilitate mounting and dismounting. They are available with either a cylindrical or a tapered bore (taper 1:12). In machine tool applications, cylindrical roller bearings with a tapered bore are preferred, because the taper enables more accurate adjustment of clearance or preload during installation.

NNU design
The rollers of NNU design bearings are guided between integral flanges on the outer ring. The inner ring has no flanges. Therefore, the bearing can accommodate axial displacement of the shaft relative to the housing in both directions, within the bearing. NNU design bearings, with a very low cross sectional height, provide a higher degree of stiffness than bearings in the NN 30 series. However, NN 30 series bearings can accommodate
heavier loads. Boundary dimensions of NNU design bearings are in accordance with ISO Dimension Series 49.