Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71918 CB/HCP4A
71918 CB/HCP4A
Dimensions
| d | 90 | mm | |
| D | 125 | mm | |
| B | 18 | mm | |
| d1 | 103 | mm | |
| d2 | 101.4 | mm | |
| D2 | 115 | mm | |
| r1,2 | min. | 1.1 | mm |
| r3,4 | min. | 0.6 | mm |
| a | 27.5 | mm |
Abutment dimensions
| da | min. | 96 | mm |
| db | min. | 96 | mm |
| Da | max. | 119 | mm |
| Db | max. | 121.8 | mm |
| ra | max. | 1 | mm |
| rb | max. | 0.6 | mm |
| dn | 103.9 | mm |
Calculation data
| Basic dynamic load rating | C | 23.8 | kN | |
| Basic static load rating | C0 | 28.5 | kN | |
| Fatigue load limit | Pu | 0.72 | kN | |
| Attainable speed for grease lubrication | 16000 | r/min | ||
| Attainable speed for oil-air lubrication | 26000 | r/min | ||
| Ball diameter | Dw | 7.144 | mm | |
| Number of balls | z | 36 | ||
| Reference grease quantity | Gref | 7.37 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 59 | N | |
| Static axial stiffness, preload class A | 59 | N/µm | ||
| Preload class B | GB | 120 | N | |
| Static axial stiffness, preload class B | 78 | N/µm | ||
| Preload class C | GC | 355 | N | |
| Static axial stiffness, preload class C | 124 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.12 | ||
| 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 | 10 | ||
Mass
| Mass bearing | 0.56 | kg |