SKF Cyl. roller bearings, single row open design, NU 308 ECP 40x 90x23

Type NU, NJ and NUP
SKF basic design single row cylindrical roller bearings are available in several designs. The main difference is the configuration of the flanges. The most popular designs are:
NU design
NU design bearings have two integral flanges on the outer ring and no flanges on the inner ring. These bearings can accommodate axial displacement of the shaft relative to the housing in both directions.
NJ design
NJ design bearings have two integral flanges on the outer ring and one on the inner ring. These bearings are used to locate the shaft axially in one direction. They can accommodate axial displacement of the shaft relative to the housing in one direction only.
NUP design
NUP design bearings have two integral flanges on the outer ring and one integral flange and one non-integral flange i.e. a loose flange ring, on the inner ring. These bearings are used to locate the shaft axially in both directions.
Main dimensions: DIN 5412-1:2000 / DIN 616:2000 / ISO 15:1998

Permissible misalignment:
Bearing series 2, 3: 4°
Bearing series 22, 23: 3°

Suffixes:
EC Single row cylindrical roller bearing with an optimized internal design and with modified roller end/flange contact
P Injection moulded cage of glass fibre reinforced polyamide 66, rolling element centred
J Pressed steel cage, rolling element centred, unhardened; different designs are identified by a figure, e.g. J1
C3 Radial internal clearance greater than normal
C4 Radial internal clearance greater than C3.