Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 7048 CD/HCP4A
7048 CD/HCP4A
Dimensions
| d | 240 | mm | |
| D | 360 | mm | |
| B | 56 | mm | |
| d1 | 277 | mm | |
| d2 | 277 | mm | |
| D1 | 323 | mm | |
| r1,2 | min. | 3 | mm |
| r3,4 | min. | 1.5 | mm |
| a | 68.4 | mm |
Abutment dimensions
| da | min. | 253 | mm |
| db | min. | 253 | mm |
| Da | max. | 347 | mm |
| Db | max. | 354 | mm |
| ra | max. | 2.5 | mm |
| rb | max. | 1.5 | mm |
| dn | 287 | mm |
Calculation data
| Basic dynamic load rating | C | 345 | kN | |
| Basic static load rating | C0 | 490 | kN | |
| Fatigue load limit | Pu | 12 | kN | |
| Attainable speed for grease lubrication | 4500 | r/min | ||
| Attainable speed for oil-air lubrication | 7000 | r/min | ||
| Ball diameter | Dw | 38.1 | mm | |
| Number of balls | z | 22 | ||
| Reference grease quantity | Gref | 216 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 1300 | N | |
| Static axial stiffness, preload class A | 260 | N/µm | ||
| Preload class B | GB | 2600 | N | |
| Static axial stiffness, preload class B | 350 | N/µm | ||
| Preload class C | GC | 5200 | N | |
| Static axial stiffness, preload class C | 486 | N/µm | ||
| Preload class D | GD | 10400 | N | |
| Static axial stiffness, preload class D | 695 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.15 | ||
| Calculation factor | f1 | 1 | ||
| Calculation factor | f2A | 1 | ||
| Calculation factor | f2B | 1.02 | ||
| Calculation factor | f2C | 1.05 | ||
| Calculation factor | f2D | 1.09 | ||
| Calculation factor | fHC | 1.02 | ||
| Calculation factor | f0 | 15.8 | ||
Mass
| Mass bearing | 14.1 | kg |