7008 ACE/P4AL
Super-precision, high-speed E design, single row angular contact ball bearing suitable for direct oil-air lubricationwith 25° contact angle, accommodate radial and axial loads acting simultaneously, where the axial load acts in one direction only. They are designed to accommodate very high speeds. Compared to the equivalent SKF B design high-speed bearings, have a slightly higher speed capability and can accommodate heavier loads. They have two lubrication holes, an annular groove, and two annular O-ring grooves in their outer rings.
- Suitable for direct oil-air lubrication
- Very high running accuracy
- Accommodate very high speeds
- Accommodate relatively high radial loads and large unilateral axial loads
Description
| Universal matching bearing(s) | No |
Dimensions
| d | 40 mm | Bore diameter |
|---|---|---|
| D | 68 mm | Outside diameter |
| B | 15 mm | Width |
| d1 | 49.7 mm | Shoulder diameter of inner ring (large side face) |
| d2 | 47.6 mm | Shoulder diameter of inner ring (small side face) |
| D1 | 58.25 mm | Shoulder diameter of outer ring (large side face) |
| b | 1.7 mm | Width of lubrication groove |
| C1 | 7.8 mm | Distance from outer ring side face to lubrication groove / lubrication hole |
| C2 | 2.5 mm | Distance from outer ring side face to O-ring groove |
| C3 | 3 mm | Distance from outer ring side face to O-ring groove |
| r1,2 | min. 1 mm | Chamfer dimension |
| r3,4 | min. 0.6 mm | Chamfer dimension |
| a | 20.3 mm | Distance from side face to pressure point |
Abutment dimensions
| da | min. 44.6 mm | Diameter of shaft abutment |
|---|---|---|
| db | min. 44.6 mm | Diameter of shaft abutment |
| Da | max. 63.4 mm | Diameter of housing abutment |
| Db | max. 63.8 mm | Diameter of housing abutment |
| ra | max. 1 mm | Radius of fillet |
| rb | max. 0.6 mm | Radius of fillet |
| dn | 51.6 mm | Position of oil nozzle |
Calculation data
| Basic dynamic load rating | C | 11.7 kN |
|---|---|---|
| Basic static load rating | C0 | 7.2 kN |
| Fatigue load limit | Pu | 0.305 kN |
| Attainable speed for grease lubrication | 27 000 r/min | |
| Attainable speed for oil-air lubrication | 41 000 r/min | |
| Contact angle | α | 25 ° |
| Ball diameter | Dw | 7.144 mm |
| Number of balls (per bearing) | z | 19 |
| Reference grease quantity (per bearing) | Gref | 2.8 cm³ |
| Preload class A | GA | 105 N |
|---|---|---|
| Axial stiffness for preload A (sets of two brgs back-to-back or face-to-face) | 87 N/µm | |
| Preload class B | GB | 310 N |
| Axial stiffness for preload B (sets of two brgs back-to-back or face-to-face) | 129 N/µm | |
| Preload class C | GC | 630 N |
| Axial stiffness for preload C (sets of two brgs back-to-back or face-to-face) | 169 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 | 1.03 |
| Correction factor, preload class C | f2C | 1.06 |
| 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 | 0.19 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.
