Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 708 CD/HCP4A
708 CD/HCP4A
Dimensions
| d | 8 | mm | |
| D | 22 | mm | |
| B | 7 | mm | |
| d1 | 12.6 | mm | |
| d2 | 12.6 | mm | |
| D1 | 17.4 | mm | |
| r1,2 | min. | 0.3 | mm |
| r3,4 | min. | 0.2 | mm |
| a | 5.5 | mm |
Abutment dimensions
| da | min. | 10 | mm |
| db | min. | 10 | mm |
| Da | max. | 20 | mm |
| Db | max. | 20.6 | mm |
| ra | max. | 0.3 | mm |
| rb | max. | 0.2 | mm |
| dn | 13.6 | mm |
Calculation data
| Basic dynamic load rating | C | 3.25 | kN | |
| Basic static load rating | C0 | 1.37 | kN | |
| Fatigue load limit | Pu | 0.057 | kN | |
| Attainable speed for grease lubrication | 110000 | r/min | ||
| Attainable speed for oil-air lubrication | 160000 | r/min | ||
| Ball diameter | Dw | 3.969 | mm | |
| Number of balls | z | 9 | ||
| Reference grease quantity | Gref | 0.15 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 10 | N | |
| Static axial stiffness, preload class A | 12 | N/µm | ||
| Preload class B | GB | 20 | N | |
| Static axial stiffness, preload class B | 16 | N/µm | ||
| Preload class C | GC | 40 | N | |
| Static axial stiffness, preload class C | 21 | N/µm | ||
| Preload class D | GD | 80 | N | |
| Static axial stiffness, preload class D | 30 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.02 | ||
| Calculation factor | f1 | 1 | ||
| Calculation factor | f2A | 1 | ||
| Calculation factor | f2B | 1.02 | ||
| Calculation factor | f2C | 1.05 | ||
| Calculation factor | f2D | 1.09 | ||
| Calculation factor | fHC | 1.02 | ||
| Calculation factor | f0 | 8.4 | ||
Mass
| Mass bearing | 0.011 | kg |