Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71809 CD/HCP4
71809 CD/HCP4
Dimensions
| d | 45 | mm | |
| D | 58 | mm | |
| B | 7 | mm | |
| d1 | 49.6 | mm | |
| d2 | 49.6 | mm | |
| D1 | 53.6 | mm | |
| r1,2 | min. | 0.3 | mm |
| r3,4 | min. | 0.15 | mm |
| a | 10.4 | mm |
Abutment dimensions
| da | min. | 47 | mm |
| db | min. | 47 | mm |
| Da | max. | 56 | mm |
| Db | max. | 57.2 | mm |
| ra | max. | 0.3 | mm |
| rb | max. | 0.15 | mm |
| dn | 50 | mm |
Calculation data
| Basic dynamic load rating | C | 4.88 | kN | |
| Basic static load rating | C0 | 5.3 | kN | |
| Fatigue load limit | Pu | 0.224 | kN | |
| Attainable speed for grease lubrication | 26000 | r/min | ||
| Attainable speed for oil-air lubrication | 40000 | r/min | ||
| Ball diameter | Dw | 3.175 | mm | |
| Number of balls | z | 31 | ||
| Reference grease quantity | Gref | 0.36 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 27 | N | |
| Static axial stiffness, preload class A | 42 | N/µm | ||
| Preload class B | GB | 80 | N | |
| Static axial stiffness, preload class B | 72 | N/µm | ||
| Preload class C | GC | 160 | N | |
| Static axial stiffness, preload class C | 106 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.24 | ||
| Calculation factor | f1 | 1 | ||
| Calculation factor | f2A | 1 | ||
| Calculation factor | f2B | 1.1 | ||
| Calculation factor | f2C | 1.18 | ||
| Calculation factor | fHC | 1.02 | ||
| Calculation factor | f0 | 17.4 | ||
Mass
| Mass bearing | 0.037 | kg |