NJ217EV12---is a stand single row NTN Cylindrical roller bearings, NJ type, with molded resign cage, which has double ribs on outer ring, single rib on inner ring, and can accommodate heavy radial loads in single direction. Furthermore, these NTN bearings are separable, and relatively easy to install and disassemble even when interference fits are required.

NTN NJ217EV12 cylindrical roller bearings product data in the following: 

 
d: 85mm
D: 150mm
B: 28mm
M: 2.11kg
Basic dynamic load rating:...

NTN 7915CDB/GNP4 is free paired P4 grade angular contact ball bearings, with molded resign cage and have a 15"contact angular, compound mode back-to-back DB type, which has a large distance between the acting load center of the bearing, therefore these NTN bearings have a large momentary force load capacity, and can accommodate radial loads and axial loads in either direction.

NTN 7910 CDB/GNP4Angular contact ball bearings product data as below,
   
d = 50mm
D = 72mm
M = 12mm
Mass = 0.157kg
Ba...

2209-DDU is ordinary large size NTN spherical roller bearings 223 series, with machined cage, and cylindrical bore. This bearing has self-aligning properties, and therefore is suited for use where misalignment between the inner and outer rings occurs from housing installation error or shaft flexure. So these NTN bearings have a large capacity for radial loads, axial loads in either direction, and complex loads.

NTN spherical roller thrust bearings 22332BD1/C4 details as bellow: 
   
d: 160mm
D:...

52308 is the most common sizes SKF Thrust ball bearings, double row, which can accommodate axial loads acting in both directions and can thus serve to axially locate a shaft in both directions. And these SKF bearings are widely used in motor, industrial machinery, CNC lathes, high-precision processing machine, locomotive industry, etc.

More details we can learn from SKF Thrust ball bearings 52308 as below:

  
d: 30mm
D: 78mm
B: 49mm
M: 1.05 kg
C : Basic dynamic load rating,  61.8 KN  
C0: Basic ...