Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71904 CE/HCP4AH
71904 CE/HCP4AH
Dimensions
| d | 20 | mm | |
| D | 37 | mm | |
| B | 9 | mm | |
| d1 | 25.65 | mm | |
| d2 | 24.4 | mm | |
| D1 | 31.49 | mm | |
| K | 0.5 | mm | |
| C1 | 5.45 | mm | |
| r1,2 | min. | 0.3 | mm |
| r3,4 | min. | 0.15 | mm |
| a | 8.5 | mm |
Abutment dimensions
| da | min. | 22 | mm |
| db | min. | 22 | mm |
| Da | max. | 35 | mm |
| Db | max. | 36.2 | mm |
| ra | max. | 0.3 | mm |
| rb | max. | 0.15 | mm |
| dn | 26.7 | mm |
Calculation data
| Basic dynamic load rating | C | 4.88 | kN | |
| Basic static load rating | C0 | 2.4 | kN | |
| Fatigue load limit | Pu | 0.102 | kN | |
| Attainable speed for grease lubrication | 68000 | r/min | ||
| Attainable speed for oil-air lubrication | 106000 | r/min | ||
| Ball diameter | Dw | 4.762 | mm | |
| Number of balls | z | 14 | ||
| Reference grease quantity | Gref | 0.5 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 26 | N | |
| Static axial stiffness, preload class A | 20 | N/µm | ||
| Preload class B | GB | 79 | N | |
| Static axial stiffness, preload class B | 31 | N/µm | ||
| Preload class C | GC | 157 | N | |
| Static axial stiffness, preload class C | 43 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.04 | ||
| 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 | 7.8 | ||
Mass
| Mass bearing | 0.032 | kg |