Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 7212 CD/HCP4A
7212 CD/HCP4A
Dimensions
| d | 60 | mm | |
| D | 110 | mm | |
| B | 22 | mm | |
| d1 | 76.4 | mm | |
| d2 | 76.4 | mm | |
| D1 | 93.6 | mm | |
| r1,2 | min. | 1.5 | mm |
| r3,4 | min. | 0.6 | mm |
| a | 22.5 | mm |
Abutment dimensions
| da | min. | 69 | mm |
| db | min. | 69 | mm |
| Da | max. | 101 | mm |
| Db | max. | 105.8 | mm |
| ra | max. | 1.5 | mm |
| rb | max. | 0.6 | mm |
| dn | 80.1 | mm |
Calculation data
| Basic dynamic load rating | C | 57.2 | kN | |
| Basic static load rating | C0 | 46.5 | kN | |
| Fatigue load limit | Pu | 2 | kN | |
| Attainable speed for grease lubrication | 16000 | r/min | ||
| Attainable speed for oil-air lubrication | 24000 | r/min | ||
| Ball diameter | Dw | 14.288 | mm | |
| Number of balls | z | 16 | ||
| Reference grease quantity | Gref | 10.08 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 215 | N | |
| Static axial stiffness, preload class A | 83 | N/µm | ||
| Preload class B | GB | 430 | N | |
| Static axial stiffness, preload class B | 113 | N/µm | ||
| Preload class C | GC | 860 | N | |
| Static axial stiffness, preload class C | 158 | N/µm | ||
| Preload class D | GD | 1720 | N | |
| Static axial stiffness, preload class D | 228 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.07 | ||
| Calculation factor | f1 | 1 | ||
| Calculation factor | f2A | 1 | ||
| Calculation factor | f2B | 1.01 | ||
| Calculation factor | f2C | 1.03 | ||
| Calculation factor | f2D | 1.06 | ||
| Calculation factor | fHC | 1.01 | ||
| Calculation factor | f0 | 14.9 | ||
Mass
| Mass bearing | 0.69 | kg |