Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71918 CD/HCP4AL
71918 CD/HCP4AL
Dimensions
| d | 90 | mm | |
| D | 125 | mm | |
| B | 18 | mm | |
| d1 | 100.8 | mm | |
| d2 | 100.8 | mm | |
| D1 | 114.2 | mm | |
| b | 2.6 | mm | |
| C1 | 9.3 | mm | |
| C2 | 4.2 | mm | |
| C3 | 3 | mm | |
| r1,2 | min. | 1.1 | mm |
| r3,4 | min. | 0.6 | mm |
| a | 23.5 | mm |
Abutment dimensions
| da | min. | 96 | mm |
| db | min. | 96 | mm |
| Da | max. | 119 | mm |
| Db | max. | 121 | mm |
| ra | max. | 1 | mm |
| rb | max. | 0.6 | mm |
| dn | 103.3 | mm |
Calculation data
| Basic dynamic load rating | C | 47.5 | kN | |
| Basic static load rating | C0 | 51 | kN | |
| Fatigue load limit | Pu | 2.08 | kN | |
| Attainable speed for grease lubrication | 13000 | r/min | ||
| Attainable speed for oil-air lubrication | 19000 | r/min | ||
| Ball diameter | Dw | 11.112 | mm | |
| Number of balls | z | 26 | ||
| Reference grease quantity | Gref | 7.5 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 180 | N | |
| Static axial stiffness, preload class A | 104 | N/µm | ||
| Preload class B | GB | 360 | N | |
| Static axial stiffness, preload class B | 143 | N/µm | ||
| Preload class C | GC | 720 | N | |
| Static axial stiffness, preload class C | 203 | N/µm | ||
| Preload class D | GD | 1440 | N | |
| Static axial stiffness, preload class D | 297 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.23 | ||
| Calculation factor | f1 | 1 | ||
| Calculation factor | f2A | 1 | ||
| Calculation factor | f2B | 1.07 | ||
| Calculation factor | f2C | 1.12 | ||
| Calculation factor | f2D | 1.18 | ||
| Calculation factor | fHC | 1.04 | ||
| Calculation factor | f0 | 16.3 | ||
Mass
| Mass bearing | 0.47 | kg |