Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71908 CB/HCP4A
71908 CB/HCP4A
Dimensions
| d | 40 | mm | |
| D | 62 | mm | |
| B | 12 | mm | |
| d1 | 48.46 | mm | |
| d2 | 47.6 | mm | |
| D2 | 55.64 | mm | |
| r1,2 | min. | 0.6 | mm |
| r3,4 | min. | 0.3 | mm |
| a | 14.8 | mm |
Abutment dimensions
| da | min. | 43.2 | mm |
| db | min. | 43.2 | mm |
| Da | max. | 58.8 | mm |
| Db | max. | 60 | mm |
| ra | max. | 0.6 | mm |
| rb | max. | 0.3 | mm |
| dn | 49.1 | mm |
Calculation data
| Basic dynamic load rating | C | 7.15 | kN | |
| Basic static load rating | C0 | 6.95 | kN | |
| Fatigue load limit | Pu | 0.176 | kN | |
| Attainable speed for grease lubrication | 36000 | r/min | ||
| Attainable speed for oil-air lubrication | 56000 | r/min | ||
| Ball diameter | Dw | 3.969 | mm | |
| Number of balls | z | 28 | ||
| Reference grease quantity | Gref | 1.38 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 18 | N | |
| Static axial stiffness, preload class A | 27 | N/µm | ||
| Preload class B | GB | 36 | N | |
| Static axial stiffness, preload class B | 36 | N/µm | ||
| Preload class C | GC | 110 | N | |
| Static axial stiffness, preload class C | 58 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.06 | ||
| Calculation factor | f1 | 1 | ||
| Calculation factor | f2A | 1 | ||
| Calculation factor | f2B | 1.03 | ||
| Calculation factor | f2C | 1.08 | ||
| Calculation factor | fHC | 1.01 | ||
| Calculation factor | f0 | 9.8 | ||
Mass
| Mass bearing | 0.11 | kg |