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| Inner Diameter | 17 mm | 
| Outer ring type | flat | 
| Weight | 100 g | 
| Width | 17.5 mm | 
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                | Inner Diameter | 17 mm | 
| Outer ring type | flat | 
| Weight | 100 g | 
| Width | 17.5 mm | 
| No. of Track Trains | Double row | 
| Shield Shape | Open type | 
| Race ring shape | Angular contact ball bearings | 
| Outer Diameter | 40 mm | 
| Material | High Carbon Chromium Steel | 
| Rolling element material | High carbon chromium bearing steel | 
| JIS grade | 0 | 
| Basic static load rating Cor (N) | 9050 | 
| Basic dynamic load rating Cr (N) | 14600 | 
| Monotaro ID | 00342501 | 
| Type of Product | Double Row Angular Contact Ball Bearing | 
| Model No | 5203S | 
| Load direction | radial | 
| Chamfering Size r (mm) | 0.6 (minimum) | 
| Working Point a (mm) | 20.8 | 
| Grease Limiting Speed (RPM) | 11000 | 
| Oil Limiting Speed (RPM) | 15000 | 
| Country of Origin | Japan | 
| Origin Type | Japan | 
| Import Country | Japan | 
| Name of Manufacturer/Packer/Importer | NTN Corp. |