Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 7220 CD/P4A
7220 CD/P4A
Dimensions
| d | 100 | mm | |
| D | 180 | mm | |
| B | 34 | mm | |
| d1 | 124.7 | mm | |
| d2 | 124.7 | mm | |
| D1 | 155.3 | mm | |
| r1,2 | min. | 2.1 | mm |
| r3,4 | min. | 1.1 | mm |
| a | 35.9 | mm |
Abutment dimensions
| da | min. | 112 | mm |
| db | min. | 112 | mm |
| Da | max. | 168 | mm |
| Db | max. | 173 | mm |
| ra | max. | 2 | mm |
| rb | max. | 1 | mm |
| dn | 131.4 | mm |
Calculation data
| Basic dynamic load rating | C | 156 | kN | |
| Basic static load rating | C0 | 137 | kN | |
| Fatigue load limit | Pu | 4.9 | kN | |
| Attainable speed for grease lubrication | 7500 | r/min | ||
| Attainable speed for oil-air lubrication | 12000 | r/min | ||
| Ball diameter | Dw | 25.4 | mm | |
| Number of balls | z | 15 | ||
| Reference grease quantity | Gref | 40.899 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 590 | N | |
| Static axial stiffness, preload class A | 122 | N/µm | ||
| Preload class B | GB | 1180 | N | |
| Static axial stiffness, preload class B | 165 | N/µm | ||
| Preload class C | GC | 2360 | N | |
| Static axial stiffness, preload class C | 230 | N/µm | ||
| Preload class D | GD | 4720 | N | |
| Static axial stiffness, preload class D | 331 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.09 | ||
| 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 | 14.5 | ||
Mass
| Mass bearing | 3.24 | kg |