Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 7209 CD/P4A
7209 CD/P4A
Dimensions
| d | 45 | mm | |
| D | 85 | mm | |
| B | 19 | mm | |
| d1 | 57.3 | mm | |
| d2 | 57.3 | mm | |
| D1 | 72.7 | mm | |
| r1,2 | min. | 1.1 | mm |
| r3,4 | min. | 0.6 | mm |
| a | 18.3 | mm |
Abutment dimensions
| da | min. | 52 | mm |
| db | min. | 52 | mm |
| Da | max. | 78 | mm |
| Db | max. | 80.8 | mm |
| ra | max. | 1 | mm |
| rb | max. | 0.6 | mm |
| dn | 60.6 | mm |
Calculation data
| Basic dynamic load rating | C | 42.3 | kN | |
| Basic static load rating | C0 | 31 | kN | |
| Fatigue load limit | Pu | 1.32 | kN | |
| Attainable speed for grease lubrication | 17000 | r/min | ||
| Attainable speed for oil-air lubrication | 28000 | r/min | ||
| Ball diameter | Dw | 12.7 | mm | |
| Number of balls | z | 14 | ||
| Reference grease quantity | Gref | 5.922 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 160 | N | |
| Static axial stiffness, preload class A | 61 | N/µm | ||
| Preload class B | GB | 320 | N | |
| Static axial stiffness, preload class B | 82 | N/µm | ||
| Preload class C | GC | 640 | N | |
| Static axial stiffness, preload class C | 115 | N/µm | ||
| Preload class D | GD | 1280 | N | |
| Static axial stiffness, preload class D | 166 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.07 | ||
| Calculation factor | f1 | 1 | ||
| Calculation factor | f2A | 1 | ||
| Calculation factor | f2B | 1.01 | ||
| Calculation factor | f2C | 1.03 | ||
| Calculation factor | f2D | 1.05 | ||
| Calculation factor | fHC | 1 | ||
| Calculation factor | f0 | 14.2 | ||
Mass
| Mass bearing | 0.41 | kg |