Detailed Product Description
There are different types designated as NU, NJ, NUP, N, NF (for
single-row bearings), NNU, and NN (for double-row bearings
depending on the design or absence of side ribs).
The outer and inner rings of all types are separable.
Some cylindrical roller bearings have no ribs on either the
inner or outer ring, so the rings can move axially relative to each
other. These can be used as free-end bearings. Cylindrical roller
bearings, in which either the inner or outer rings has two ribs and
the other ring has one, are capable of taking some axial load in
one direction Double-row cylindrical roller bearings have high
radial rigidity and are used primarily for precision machine
tools.
Pressed steel or machined brass cages are generally used, but
sometimes molded polyamide cages are also used.
Types NU, N, NNU, and NN are suitable as free-end bearings.
Types NJ and NF can sustain limited axial loads in one direction.
Types NH and NUP can be used as fixed-end bearings.
NH-type cylindrical roller bearings consist of the NJ-type
cylindrical roller bearings and HJ-type L-shaped thrust
collars.
The inner ring loose rib of an NUP-type cylindrical roller
bearing should be mounted so that the marked side is on the
outside.
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