Cylindrical Roller Bearing
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Single row cylindrical roller bearings are manufactured in several basic separable designs, with different guide flange
locations to achieve a variety of capabilities. With higher basic load ratings in comparison to single row ball bearings
of the same size, single row cylindrical roller bearings are especially suitable for use in applications with heavy radial
loads, high speeds, and where interference fits are required on both bearing rings.
The NU design features two guided flanges on the outer ring and the N design features two guide flanges on the
inner ring. Both allow mutual displacement of the inner and outer rings in either direction. The NJ design has two
guide flanges on the outer ring and one on the inner, to handle axial loads in one direction. The NUP design has all
of the same features as the NJ design, in addition to a loose guide flange for the inner ring, to carry axial loads in
both directions. Axial guiding can also be achieved through the use of an HJ series angle ring in both directions with
an NH series bearing, and in one direction with an NU series design. Bearings with the design of NFD, full
complement bearings without a cage, are also available in selected sizes.
Single row cylindrical roller bearings are available in the E design; additional sizes are
gradually being introduced into standard production. The E designation stands for "extra capacity" and has an
increased load-carrying capability.Double row cylindrical roller bearings, NN design, have two rows of cylindrical rollers guided by three ribs on the inner
ring. The outer ring has no guide ribs, making the outer ring separable. This is why these bearings cannot carry axial
loads. Double row cylindrical roller bearings, type NN30K, are commonly produced with a tapered bore (1:12 taper).
These bearings are also available with cylindrical bores upon request.
Double row cylindrical roller bearings, NNU49, have three guiding ribs on the outer ring and a smooth inner ring. This
design allows the inner ring to be separable. These bearings are only designed to carry radial loads; axial loads
should not be applied.
Double row cylindrical roller bearings are significant for their great rigidity and are predominately used in the spindles
of machine tools and similar equipment.