Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71944 CD/P4A
71944 CD/P4A
Dimensions
| d | 220 | mm | |
| D | 300 | mm | |
| B | 38 | mm | |
| d1 | 244.7 | mm | |
| d2 | 244.7 | mm | |
| D1 | 275.3 | mm | |
| r1,2 | min. | 2.1 | mm |
| r3,4 | min. | 1 | mm |
| a | 54 | mm |
Abutment dimensions
| da | min. | 231 | mm |
| db | min. | 231 | mm |
| Da | max. | 289 | mm |
| Db | max. | 295 | mm |
| ra | max. | 2 | mm |
| rb | max. | 1 | mm |
| dn | 251.4 | mm |
Calculation data
| Basic dynamic load rating | C | 221 | kN | |
| Basic static load rating | C0 | 300 | kN | |
| Fatigue load limit | Pu | 7.8 | kN | |
| Attainable speed for grease lubrication | 4300 | r/min | ||
| Attainable speed for oil-air lubrication | 6300 | r/min | ||
| Ball diameter | Dw | 25.4 | mm | |
| Number of balls | z | 29 | ||
| Reference grease quantity | Gref | 84 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 850 | N | |
| Static axial stiffness, preload class A | 224 | N/µm | ||
| Preload class B | GB | 1700 | N | |
| Static axial stiffness, preload class B | 306 | N/µm | ||
| Preload class C | GC | 3400 | N | |
| Static axial stiffness, preload class C | 434 | N/µm | ||
| Preload class D | GD | 6800 | N | |
| Static axial stiffness, preload class D | 635 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.28 | ||
| 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 | 16.5 | ||
Mass
| Mass bearing | 6.6 | kg |