Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71908 CE/HCP4A
71908 CE/HCP4A
Dimensions
| d | 40 | mm | |
| D | 62 | mm | |
| B | 12 | mm | |
| d1 | 46.5 | mm | |
| d2 | 44.8 | mm | |
| D1 | 54.15 | mm | |
| r1,2 | min. | 0.6 | mm |
| r3,4 | min. | 0.3 | mm |
| a | 13.2 | mm |
Abutment dimensions
| da | min. | 43.2 | mm |
| db | min. | 42 | mm |
| Da | max. | 58.8 | mm |
| Db | max. | 60 | mm |
| ra | max. | 0.6 | mm |
| rb | max. | 0.3 | mm |
| dn | 48 | mm |
Calculation data
| Basic dynamic load rating | C | 9.75 | kN | |
| Basic static load rating | C0 | 6.1 | kN | |
| Fatigue load limit | Pu | 0.26 | kN | |
| Attainable speed for grease lubrication | 38000 | r/min | ||
| Attainable speed for oil-air lubrication | 58000 | r/min | ||
| Ball diameter | Dw | 6.35 | mm | |
| Number of balls | z | 19 | ||
| Reference grease quantity | Gref | 1.4 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 52 | N | |
| Static axial stiffness, preload class A | 35 | N/µm | ||
| Preload class B | GB | 157 | N | |
| Static axial stiffness, preload class B | 55 | N/µm | ||
| Preload class C | GC | 315 | N | |
| Static axial stiffness, preload class C | 74 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.05 | ||
| Calculation factor | f1 | 1 | ||
| Calculation factor | f2A | 1 | ||
| Calculation factor | f2B | 1.05 | ||
| Calculation factor | f2C | 1.09 | ||
| Calculation factor | fHC | 1.01 | ||
| Calculation factor | f0 | 8.3 | ||
Mass
| Mass bearing | 0.088 | kg |