Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71968 CDMA/P4A
71968 CDMA/P4A
Dimensions
| d | 340 | mm | |
| D | 460 | mm | |
| B | 56 | mm | |
| d1 | 377 | mm | |
| d2 | 377 | mm | |
| D1 | 423 | mm | |
| r1,2 | min. | 3 | mm |
| r3,4 | min. | 1.1 | mm |
| a | 81.8 | mm |
Abutment dimensions
| da | min. | 353 | mm |
| db | min. | 353 | mm |
| Da | max. | 445 | mm |
| Db | max. | 454 | mm |
| ra | max. | 2.5 | mm |
| rb | max. | 1 | mm |
| dn | 387 | mm |
Calculation data
| Basic dynamic load rating | C | 390 | kN | |
| Basic static load rating | C0 | 670 | kN | |
| Fatigue load limit | Pu | 14.3 | kN | |
| Attainable speed for grease lubrication | 2400 | r/min | ||
| Attainable speed for oil-air lubrication | 4000 | r/min | ||
| Ball diameter | Dw | 38.1 | mm | |
| Number of balls | z | 29 | ||
| Reference grease quantity | Gref | 294 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 1460 | N | |
| Static axial stiffness, preload class A | 300 | N/µm | ||
| Preload class B | GB | 2920 | N | |
| Static axial stiffness, preload class B | 408 | N/µm | ||
| Preload class C | GC | 5840 | N | |
| Static axial stiffness, preload class C | 571 | N/µm | ||
| Preload class D | GD | 11680 | N | |
| Static axial stiffness, preload class D | 827 | 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 | 16.6 | ||
Mass
| Mass bearing | 25.5 | kg |