2304 KOYO 20x52x21mm Bearing No. 2304 Self aligning ball bearings
| Bearing number | 2304 |
| Size (mm) | 20x52x21 |
| Brand | KOYO |
| Bore Diameter (mm) | 20 |
| Outer Diameter (mm) | 52 |
| Width (mm) | 21 |
| d | 20 mm |
| D | 52 mm |
| B | 21 mm |
| C | 21 mm |
| r min. | 1.1 mm |
| da min. | 26.5 mm |
| Da max. | 45.5 mm |
| ra max. | 1 mm |
| Weight | 0.209 Kg |
| Basic dynamic load rating (C) | 18.0 kN |
| Basic static load rating (C0) | 4.70 kN |
| (Grease) Lubrication Speed | 11000 r/min |
| (Oil) Lubrication Speed | 15000 r/min |
| Calculation factor (e) | 0.49 |
| Calculation factor (Y0) | 1.35 |
| Calculation factor (Y1) | 1.29 |
| Bearing No. | 2304 |
| r(min) | 1.1 |
| Cr | 18.0 |
| C0r | 4.65 |
| Cu | 0.30 |
| Grease lub. | 11000 |
| Oil lub. | 15000 |
| da(min) | 26.5 |
| Da(max) | 45.5 |
| ra(max) | 1 |
| e | 0.49 |
| Y1 | 1.29 |
| Y2 | 2.00 |
| Y0 | 1.35 |
| (Refer.)Mass(kg) | 0.209 |
Detailed Parameters
parameter：
| HSB026C Angular contact ball bearings | Size :130x200x33mm ，Outer Diameter :200mm ，Brand:NTN ，Bore Diameter :130mm |
| NAP209 Bearing units | d:45 mm ，A:54 mm ，Brand:FYH ，Bore Diameter :45mm ，Width :54mm ，B1:56.3 mm |
| NCF30/530V Cylindrical roller bearings | Size :530x780x185mm ，Bore Diameter :530mm ，Brand:SKF ，Width :185mm ，d:530 mm ，Outer Diameter :780mm |
| KUX040 2RD Angular contact ball bearings | Outer Diameter :120.65mm ，Brand:KOYO ，Size :101.6x120.65x12.7mm ，Bore Diameter :101.6mm ，Width :12.7mm |
| SEA20 /NS 7CE3 Angular contact ball bearings | d:20 mm ，Brand:SNFA ，Bore Diameter :20mm ，Outer Diameter :32mm ，Width :7mm ，Size :20x32x7mm |
| B7021-C-2RSD-T-P4S Angular contact ball bearings | Bore Diameter :105mm ，Brand:FAG ，Width :26mm ，Outer Diameter :160mm ，Size :105x160x26mm |
| 6210F600 Deep groove ball bearings | d:50.000 mm ，Width :20.000mm ，Size :50x90x20mm ，Outer Diameter :90.000mm ，Brand:SNR ，Bore Diameter :50.000mm |
| 7015 ACB/P4AL Angular contact ball bearings | Size :115x75x20mm ，Width :20mm ，Brand:SKF ，Bore Diameter :115mm ，Outer Diameter :75mm |
| NKI 35/30 Cylindrical roller bearings | Outer Diameter :35mm ，Brand:SKF ，Bore Diameter :50mm ，Size :50x35x30mm |
| MJH-981 Needle roller bearings | Outer Diameter :20.638mm ，Size :14.288x20.638x12.7mm ，Brand:Timken ，Bore Diameter :14.288mm |
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