Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 7044 CD/HCP4A
7044 CD/HCP4A
Dimensions
| d | 220 | mm | |
| D | 340 | mm | |
| B | 56 | mm | |
| d1 | 257 | mm | |
| d2 | 257 | mm | |
| D1 | 303 | mm | |
| r1,2 | min. | 3 | mm |
| r3,4 | min. | 1.5 | mm |
| a | 65.7 | mm |
Abutment dimensions
| da | min. | 233 | mm |
| db | min. | 233 | mm |
| Da | max. | 327 | mm |
| Db | max. | 334 | mm |
| ra | max. | 2.5 | mm |
| rb | max. | 1.5 | mm |
| dn | 267.1 | mm |
Calculation data
| Basic dynamic load rating | C | 338 | kN | |
| Basic static load rating | C0 | 455 | kN | |
| Fatigue load limit | Pu | 11.6 | kN | |
| Attainable speed for grease lubrication | 4800 | r/min | ||
| Attainable speed for oil-air lubrication | 7500 | r/min | ||
| Ball diameter | Dw | 38.1 | mm | |
| Number of balls | z | 21 | ||
| Reference grease quantity | Gref | 201 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 1250 | N | |
| Static axial stiffness, preload class A | 247 | N/µm | ||
| Preload class B | GB | 2500 | N | |
| Static axial stiffness, preload class B | 333 | N/µm | ||
| Preload class C | GC | 5000 | N | |
| Static axial stiffness, preload class C | 460 | N/µm | ||
| Preload class D | GD | 10000 | N | |
| Static axial stiffness, preload class D | 657 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.13 | ||
| 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 | 15.6 | ||
Mass
| Mass bearing | 13.2 | kg |