7012 ACB/P4A
Super-precision, high-speed B design, single row angular contact ball bearing with 25° contact angleThese super-precision, high-speed, single row angular contact ball bearings with 25° contact angle accommodate radial and axial loads acting simultaneously, where the axial load acts in one direction only. Compared to the equivalent SKF E design high-speed bearings, these are suited for lighter loads.
- Very high running accuracy
- Accommodate high speeds
- Reduced stresses on rolling contact surfaces
Description
| Universal matching bearing(s) | No |
Dimensions
| d | 60 mm | Bore diameter |
|---|---|---|
| D | 95 mm | Outside diameter |
| B | 18 mm | Width |
| d1 | 73.18 mm | Shoulder diameter of inner ring (large side face) |
| d2 | 71.65 mm | Shoulder diameter of inner ring (small side face) |
| D2 | 84.39 mm | Recess diameter of outer ring (large side face) |
| D4 | 86.26 mm | Recess diameter outer ring shoulder (small side face) |
| r1,2 | min. 1.1 mm | Chamfer dimension |
| r3,4 | min. 0.6 mm | Chamfer dimension |
| a | 27.2 mm | Distance from side face to pressure point |
Abutment dimensions
| da | min. 66 mm | Diameter of shaft abutment |
|---|---|---|
| db | min. 66 mm | Diameter of shaft abutment |
| Da | max. 89 mm | Diameter of housing abutment |
| Db | max. 91.8 mm | Diameter of housing abutment |
| ra | max. 1 mm | Radius of fillet |
| rb | max. 0.6 mm | Radius of fillet |
| dn | 74.2 mm | Position of oil nozzle |
Calculation data
| Basic dynamic load rating | C | 13.5 kN |
|---|---|---|
| Basic static load rating | C0 | 11.4 kN |
| Fatigue load limit | Pu | 0.48 kN |
| Attainable speed for grease lubrication | 17 000 r/min | |
| Attainable speed for oil-air lubrication | 26 000 r/min | |
| Contact angle | α | 25 ° |
| Ball diameter | Dw | 6.747 mm |
| Number of balls (per bearing) | z | 28 |
| Reference grease quantity (per bearing) | Gref | 5.03 cm³ |
| Preload class A | GA | 80 N |
|---|---|---|
| Axial stiffness for preload A (sets of two brgs back-to-back or face-to-face) | 107 N/µm | |
| Preload class B | GB | 160 N |
| Axial stiffness for preload B (sets of two brgs back-to-back or face-to-face) | 135 N/µm | |
| Preload class C | GC | 480 N |
| Axial stiffness for preload C (sets of two brgs back-to-back or face-to-face) | 204 N/µm |
| Correction factor dependent on bearing series and size | f | 1.06 |
|---|---|---|
| Correction factor dependent on contact angle | f1 | 0.99 |
| Correction factor, preload class A | f2A | 1 |
| Correction factor, preload class B | f2B | 1.01 |
| Correction factor, preload class C | f2C | 1.04 |
| Correction factor for hybrid bearings | fHC | 1 |
| Limiting value | e | 0.68 |
| Axial load factor (single, tandem) | Y2 | 0.87 |
| Axial load factor (single, tandem) | Y0 | 0.38 |
| Radial load factor (single, tandem) | X2 | 0.41 |
| Axial load factor (back-to-back, face-to-face) | Y1 | 0.92 |
| Axial load factor (back-to-back, face-to-face) | Y2 | 1.41 |
| Axial load factor (back-to-back, face-to-face) | Y0 | 0.76 |
| Radial load factor (back-to-back, face-to-face) | X2 | 0.67 |
Mass
| Mass | 0.45 kg |
Tolerances and clearances
Product details
- Tolerances: P4A, P4B, P4, PA9A, P2
- Clamping and fitting forces: D design, E design, B design
- Designation suffixes H, H1, L and L1 identify variants for direct oil-air lubrication.
Principles of bearing selection and application
- Chamfer dimensions
- Seat tolerances for standard conditions: shafts, housings
- Values for ISO tolerance classes: shafts, housings
- Speed dependent initial grease fill → Initial grease fill
