Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71912 CD/P4A
71912 CD/P4A
Dimensions
| d | 60 | mm | |
| D | 85 | mm | |
| B | 13 | mm | |
| d1 | 67.7 | mm | |
| d2 | 67.7 | mm | |
| D1 | 77.3 | mm | |
| r1,2 | min. | 1 | mm |
| r3,4 | min. | 0.3 | mm |
| a | 16.3 | mm |
Abutment dimensions
| da | min. | 64.6 | mm |
| db | min. | 64.6 | mm |
| Da | max. | 80.4 | mm |
| Db | max. | 83 | mm |
| ra | max. | 1 | mm |
| rb | max. | 0.3 | mm |
| dn | 69.7 | mm |
Calculation data
| Basic dynamic load rating | C | 19.9 | kN | |
| Basic static load rating | C0 | 15.3 | kN | |
| Fatigue load limit | Pu | 0.655 | kN | |
| Attainable speed for grease lubrication | 15000 | r/min | ||
| Attainable speed for oil-air lubrication | 24000 | r/min | ||
| Ball diameter | Dw | 7.938 | mm | |
| Number of balls | z | 24 | ||
| Reference grease quantity | Gref | 2.7 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 70 | N | |
| Static axial stiffness, preload class A | 50 | N/µm | ||
| Preload class B | GB | 140 | N | |
| Static axial stiffness, preload class B | 67 | N/µm | ||
| Preload class C | GC | 280 | N | |
| Static axial stiffness, preload class C | 92 | N/µm | ||
| Preload class D | GD | 560 | N | |
| Static axial stiffness, preload class D | 130 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.17 | ||
| Calculation factor | f1 | 1 | ||
| Calculation factor | f2A | 1 | ||
| Calculation factor | f2B | 1.04 | ||
| Calculation factor | f2C | 1.09 | ||
| Calculation factor | f2D | 1.15 | ||
| Calculation factor | fHC | 1 | ||
| Calculation factor | f0 | 10.5 | ||
Mass
| Mass bearing | 0.19 | kg |