Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71956 CD/P4A
71956 CD/P4A
Dimensions
| d | 280 | mm | |
| D | 380 | mm | |
| B | 46 | mm | |
| d1 | 311.8 | mm | |
| d2 | 311.8 | mm | |
| D1 | 348.2 | mm | |
| r1,2 | min. | 2.1 | mm |
| r3,4 | min. | 1.1 | mm |
| a | 67.4 | mm |
Abutment dimensions
| da | min. | 291 | mm |
| db | min. | 291 | mm |
| Da | max. | 369 | mm |
| Db | max. | 374 | mm |
| ra | max. | 2 | mm |
| rb | max. | 1 | mm |
| dn | 319.7 | mm |
Calculation data
| Basic dynamic load rating | C | 291 | kN | |
| Basic static load rating | C0 | 455 | kN | |
| Fatigue load limit | Pu | 10.6 | kN | |
| Attainable speed for grease lubrication | 3200 | r/min | ||
| Attainable speed for oil-air lubrication | 4800 | r/min | ||
| Ball diameter | Dw | 30.162 | mm | |
| Number of balls | z | 31 | ||
| Reference grease quantity | Gref | 159 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 1090 | N | |
| Static axial stiffness, preload class A | 266 | N/µm | ||
| Preload class B | GB | 2180 | N | |
| Static axial stiffness, preload class B | 363 | N/µm | ||
| Preload class C | GC | 4360 | N | |
| Static axial stiffness, preload class C | 509 | N/µm | ||
| Preload class D | GD | 8720 | N | |
| Static axial stiffness, preload class D | 741 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.27 | ||
| 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 | 16.7 | ||
Mass
| Mass bearing | 12.9 | kg |