Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71804 CD/HCP4
71804 CD/HCP4
Dimensions
| d | 20 | mm | |
| D | 32 | mm | |
| B | 7 | mm | |
| d1 | 24.1 | mm | |
| d2 | 24.1 | mm | |
| D1 | 28.1 | mm | |
| r1,2 | min. | 0.3 | mm |
| r3,4 | min. | 0.15 | mm |
| a | 7 | mm |
Abutment dimensions
| da | min. | 22 | mm |
| db | min. | 22 | mm |
| Da | max. | 30 | mm |
| Db | max. | 31.2 | mm |
| ra | max. | 0.3 | mm |
| rb | max. | 0.15 | mm |
| dn | 24.5 | mm |
Calculation data
| Basic dynamic load rating | C | 3.9 | kN | |
| Basic static load rating | C0 | 2.65 | kN | |
| Fatigue load limit | Pu | 0.112 | kN | |
| Attainable speed for grease lubrication | 53000 | r/min | ||
| Attainable speed for oil-air lubrication | 80000 | r/min | ||
| Ball diameter | Dw | 3.175 | mm | |
| Number of balls | z | 17 | ||
| Reference grease quantity | Gref | 0.18 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 20 | N | |
| Static axial stiffness, preload class A | 25 | N/µm | ||
| Preload class B | GB | 60 | N | |
| Static axial stiffness, preload class B | 42 | N/µm | ||
| Preload class C | GC | 120 | N | |
| Static axial stiffness, preload class C | 61 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.08 | ||
| Calculation factor | f1 | 1 | ||
| Calculation factor | f2A | 1 | ||
| Calculation factor | f2B | 1.1 | ||
| Calculation factor | f2C | 1.18 | ||
| Calculation factor | fHC | 1.02 | ||
| Calculation factor | f0 | 16 | ||
Mass
| Mass bearing | 0.017 | kg |