21308CK NTN Calculation factor (Y0) 2.5 40x90x23mm Spherical roller bearings
| Bearing number | 21308CK |
| Size (mm) | 40x90x23 |
| Brand | NTN |
| Bore Diameter (mm) | 40 |
| Outer Diameter (mm) | 90 |
| Width (mm) | 23 |
| d | 40 mm |
| D | 90 mm |
| B | 23 mm |
| C | 23 mm |
| r min. | 1.5 mm |
| da min. | 48.5 mm |
| Da max. | 81.5 mm |
| ra max. | 1.5 mm |
| Weight | 0.694 Kg |
| Basic dynamic load rating (C) | 88 kN |
| Basic static load rating (C0) | 90 kN |
| (Grease) Lubrication Speed | 4 900 r/min |
| (Oil) Lubrication Speed | 6 400 r/min |
| Calculation factor (e) | 0.26 |
| Calculation factor (Y0) | 2.5 |
| Calculation factor (Y1) | 2.55 |
Detailed Parameters
parameter：
| BC7-13 Deep groove ball bearings | Bore Diameter :7mm ，Width :3mm ，Outer Diameter :13mm ，Size :7x13x3mm ，Brand:NTN |
| NAPK205-14 Bearing units | d:22.225 mm ，Brand:KOYO ，H:33.3 mm ，Bore Diameter :22.225mm ，A:44 mm |
| KDA100 Angular contact ball bearings | Brand:KOYO ，Size :254x279.4x12.7mm ，Bore Diameter :254mm ，Outer Diameter :279.4mm |
| NUP5214 Cylindrical roller bearings | Brand:ISO ，d:70 mm ，Bore Diameter :70mm ，Outer Diameter :125mm ，Width :39.69mm ，Size :70x125x39.69mm |
| UCTX15 Bearing units | d:75 mm ，K:28 mm ，Bore Diameter :75mm ，Q:70 mm ，P:111 mm ，Brand:CX |
| PCZ 0612 M Plain bearings | Width :19.05mm ，Outer Diameter :11.906mm ，Bore Diameter :9.525mm ，d:9.525 mm ，Size :9.525x11.906x19.05mm ，Brand:SKF |
| 578R/572 Tapered roller bearings | Brand:KOYO ，d:79.985 mm ，Width :36.098mm ，Bore Diameter :79.985mm |
| NU 328 ECM/C3VL2071 Cylindrical roller bearings | Width :62mm ，Bore Diameter :300mm ，Size :300x140x62mm ，Outer Diameter :140mm ，Brand:SKF ，d:140 mm |
| RNAO 40x50x17 Needle roller bearings | Outer Diameter :45mm ，Brand:NBS ，Width :17mm ，Size :40x45x17mm ，Bore Diameter :40mm |
| CSXU 090.2RS Angular contact ball bearings | Size :228.6x247.65x12.7mm ，Bore Diameter :228.6mm ，Width :12.7mm ，Outer Diameter :247.65mm ，Brand:INA |
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