NSK Cylindrical Roller Bearings, Single-Row  NU-Type, NU321W ,D=105



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NSK Cylindrical Roller Bearings, Single-Row  NU-Type, NU321W ,D=105


Boundary Dimensions
Basic Load Ratings
Limiting Speeds
d D B r
Fw Ew Cr C0r Thermal
Mechanical Grease Oil
NU321W 105 225 49 3 3 133   425 480 3400   2600 3200 9.78




Cylindrical roller bearings are classified into the following types depending on whether or not they have ribs on their rings:



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.
The NH type consists of NJ-type cylindrical roller bearings and HJ-type L-shaped thrust collars
The inner ring loose rib of the NUP type should be mounted so that the marked side is on the outside.



If a cage is nonstandard for a given bearing number the number of rollers may vary; in such a case, the load rating will differ from that listed in the bearing tables.
Many NN double-row bearings have tapered bores, and they are primarily used in the main spindles of machine tools. Cages are made of either molded polyphenylenesulfide (PPS) or machined brass.



□Formulation of Bearing Designations

Single-Row Cylindrical Roller Bearing



①Bearing type NU : Single-row cylindrical roller bearings
(Outer ring with both ribs + Inner ring without rib) Please refer to page C124 for detailed information.
②Dimension Series  10 : 10 Series, 2: 02 Series, 22 : 22 Series, 3 : 03 Series, 23 : 23 Series, 4 : 04 Series,
③Bore number   Less than 03, Bearing bore 01 : 12mm, 02 : 15mm, 03 : 17mm Over 04, Bearing bore Bore number X 5 (mm)
④Internal design E : High load capacity
⑤Cage  W : Pressed-steel Cage, M : Machined Brass Cage, No designation : Machined-brass cage (in Series 10) T : Polyamide 66 resin cage, T7 : L-PPS resin cage
⑥Internal clearance  For All Radial Brgs.
Omitted : CN clearance, C3 : Clearance greater than CN, C4 : Clearance greater than C3, CG : Special Clearance
For Non-Interchangeable Cylindrical Roller Bearings
CC : Normal Clearance, CC3 : Clearance greater than CC, CC4 : Clearance greater than CC3, CCG : Special Clearance
⑦Tolerance class  Omitted : ISO Normal,P6 : ISO Class 6,
P5 : ISO Class 5,P4 : ISO Class 4
⑧NSKHPSTM  & : NSKHPSTM Designation Tolerance Class : ISO Normal
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