NU design
The outer ring of bearings of the NU design has two integral
flanges and the inner ring is without flanges. Axial displacement
of the shaft with respect to the housing can be accommodated in
both directions within the bearing itself. The bearings are
therefore used as non-locating bearings. For manufacturing and
maintenance reasons, the two outer ring flanges of large-size
bearings of the NU design which are identified by a Drawing No. may
not be integral but take the form of loose flange rings.
N design
The inner ring has two integral flanges and the outer ring is
without flanges. Axial displacement of the shaft with respect to
the housing can be accommodated in both directions within the
bearing itself. The bearings are therefore used as non-locating
bearings.
NJ design
The outer ring has two integral flanges and the inner ring one
integral flange. The bearings are therefore suitable for the axial
location of a shaft in one direction
NUP design
The outer ring has two integral flanges and the inner ring one
integral flange and one non-integral flange in the form of a loose
flange ring. The bearings can be used as locating bearings, i.e.
they can provide axial location for a shaft in both directions