Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 7208 CD/HCP4A
7208 CD/HCP4A
Dimensions
| d | 40 | mm | |
| D | 80 | mm | |
| B | 18 | mm | |
| d1 | 53.3 | mm | |
| d2 | 53.3 | mm | |
| D1 | 66.7 | mm | |
| r1,2 | min. | 1.1 | mm |
| r3,4 | min. | 0.6 | mm |
| a | 17.1 | mm |
Abutment dimensions
| da | min. | 47 | mm |
| db | min. | 47 | mm |
| Da | max. | 73 | mm |
| Db | max. | 75.8 | mm |
| ra | max. | 1 | mm |
| rb | max. | 0.6 | mm |
| dn | 56.2 | mm |
Calculation data
| Basic dynamic load rating | C | 33.8 | kN | |
| Basic static load rating | C0 | 24 | kN | |
| Fatigue load limit | Pu | 1.02 | kN | |
| Attainable speed for grease lubrication | 22000 | r/min | ||
| Attainable speed for oil-air lubrication | 34000 | r/min | ||
| Ball diameter | Dw | 11.112 | mm | |
| Number of balls | z | 14 | ||
| Reference grease quantity | Gref | 4.725 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 125 | N | |
| Static axial stiffness, preload class A | 59 | N/µm | ||
| Preload class B | GB | 250 | N | |
| Static axial stiffness, preload class B | 79 | N/µm | ||
| Preload class C | GC | 500 | N | |
| Static axial stiffness, preload class C | 111 | N/µm | ||
| Preload class D | GD | 1000 | N | |
| Static axial stiffness, preload class D | 159 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.05 | ||
| Calculation factor | f1 | 1 | ||
| Calculation factor | f2A | 1 | ||
| Calculation factor | f2B | 1.01 | ||
| Calculation factor | f2C | 1.03 | ||
| Calculation factor | f2D | 1.06 | ||
| Calculation factor | fHC | 1.01 | ||
| Calculation factor | f0 | 14.4 | ||
Mass
| Mass bearing | 0.33 | kg |