Single-row						Double-row		Four-row
NU	NJ	NUP	N	NF	NH	NNU	NN	Mainly use on rolling mill roll neck
NU1000, NU200(R), NU300(R), NU400   NU2200(R), NU2300(R)     NU3200, NU3300						Cylindrical bore NNU4900 NNU4900K	Tapered bore NN3000 NN3000K	(FC), (4CR)

Since the design allowing linear contact of cylindrical rollers with the raceway provides strong resistance to radial load, this type is suitable for use under heavy radial load and impact load, as well as at high speed. N and NU types are ideal for use on the free side: they are movable in the shaft direction in response to changes in bearing position relative to the shaft or housing, which are caused by heat expansion of the shaft or improper mounting. NJ and NF types can accommodate axial load in one direction: and NH and NUP types can accommodate partial axial load in both directions. With separable inner and outer ring, this type ensures easy mounting. Due to their high rigidity, NNU and NN types are widely used in machine tool spindles.