Multi-Row Roller Bearings  

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Multi-Row Roller Bearings are primarily designed and used as roll-neck bearings in rolling mills. The four rows of rollers lends itself to carry large radial loads for the given bearing cross section. Contoured rollers with tight diametrical tolerances maximize the ability of this bearing to evenly distribute the load to all four rows. Most common types include the use of a machined brass finger cage or a machined mild steel finger cage. No suffix is required for the brass cage but the SM suffix is used for the steel. In larger sizes, the use of a steel pin type cage with hollow rollers is standard. Many outer race and inner race configurations and design types are available to meet installation or interchangeability requirements. Most bearings are supplied with C4 Internal Radial Clearance and P5 Accuracy to perform well in these roll neck applications.


A big advantage of multi-row  roller bearings is their very high radial load capacity. Due to the large number of rolling elements the impact force is well distributed. The friction is lower than at other multi row bearing types. Multi row cylindrical roller bearings cannot absorb axial forces. However, in service an axial displacement is possible.


Bearing Number Bore Dia Outer DIa Width Size
NTN  NNU4984K Multi-Row Roller Bearings   Periodic Lubrication 29 N/mm2;S 500SP1 SL1 15 mm
NTN  NN3028 Multi-Row Roller Bearings   Split Cylindrical Ro 13.0000 in Split Pillow Block Round
NTN  NN3056 Multi-Row Roller Bearings   15.2500 in 6.4375 in 23-1/8 in 7.5000 in
NTN  NNU3060 Multi-Row Roller Bearings   Standard Duty 5.3750 in Four-Bolt Flange Triple Lip
NTN  NNU3068 Multi-Row Roller Bearings   848330 SS CT-1000-K26, SAE841 2 in
NTN  NN3932 Multi-Row Roller Bearings   0.34 0.0919 240.000 mm YMB
NTN  NN3022 Multi-Row Roller Bearings   Open Without Snap Ring Round 15 mm
NTN  NN3020 Multi-Row Roller Bearings   0.020 in 0.24 lb ISO-GARD® Flange Ambient
NTN  NN3034K Multi-Row Roller Bearings   0328005000 250 mm Straight Chrome Steel
NTN  NN3936K Multi-Row Roller Bearings   Oil-Impregnated Sint 1200 fp/min 6-1/2 in MIL-B-5687C Type I C
NTN  NNU3184 Multi-Row Roller Bearings   Class 2 4.3750 in 2.8125 in 7.0000 in
NTN  NN3932 Multi-Row Roller Bearings   24.9950 in TDO Assembly Steel Open