7021 ACDGC/P4AL
Super-precision, high-capacity, universally matchable single row angular contact ball bearing suitable for direct oil-air lubricationThese super-precision, high-capacity, single row angular contact ball bearings accommodate radial and axial loads acting simultaneously, where the axial load acts in one direction only. They are designed to accommodate heavy loads at relatively high speeds under low to moderate operating temperatures. Being universally matchable, they can be used together in arrangements to provide effective load sharing, within a predetermined preload range, without the use of shims or similar devices. 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
- Very high load carrying capacity
- Relatively high speed and stiffness
- Universally matchable
Description
| Universal matching bearing(s) | Yes, back-to-back (<>), face-to-face (><) or tandem (>>) |
Dimensions
| d | 105 mm | Bore diameter |
|---|---|---|
| D | 160 mm | Outside diameter |
| B | 26 mm | Width |
| d1 | 121.9 mm | Shoulder diameter of inner ring (large side face) |
| d2 | 121.9 mm | Shoulder diameter of inner ring (small side face) |
| D1 | 143.1 mm | Shoulder diameter of outer ring (large side face) |
| b | 2.4 mm | Width of lubrication groove |
| K | 0.5 mm | Diameter of lubrication hole |
| C1 | 14.1 mm | Distance from outer ring side face to lubrication groove / lubrication hole |
| C2 | 6.2 mm | Distance from outer ring side face to O-ring groove |
| C3 | 5 mm | Distance from outer ring side face to O-ring groove |
| r1,2 | min. 2 mm | Chamfer dimension |
| r3,4 | min. 1 mm | Chamfer dimension |
| a | 44 mm | Distance from side face to pressure point |
Abutment dimensions
| da | min. 114 mm | Diameter of shaft abutment |
|---|---|---|
| db | min. 114 mm | Diameter of shaft abutment |
| Da | max. 151 mm | Diameter of housing abutment |
| Db | max. 155 mm | Diameter of housing abutment |
| ra | max. 2 mm | Radius of fillet |
| rb | max. 1 mm | Radius of fillet |
Calculation data
| Basic dynamic load rating | C | 90.4 kN |
|---|---|---|
| Basic static load rating | C0 | 93 kN |
| Fatigue load limit | Pu | 3.4 kN |
| Contact angle | α | 25 ° |
| Ball diameter | Dw | 17.462 mm |
| Number of balls (per bearing) | z | 21 |
| Reference grease quantity (per bearing) | Gref | 20.4 cm³ |
| Preload class A | GA | 2 240 N |
|---|---|---|
| Axial stiffness for preload A (sets of two brgs back-to-back or face-to-face) | 484 N/µm | |
| Preload class C | GC | 2 240 N |
| Axial stiffness for preload C (sets of two brgs back-to-back or face-to-face) | 484 N/µm |
| Correction factor dependent on bearing series and size | f | 1.15 |
|---|---|---|
| Correction factor dependent on contact angle | f1 | 0.99 |
| Correction factor, preload class C | f2C | 1.05 |
| Correction factor for hybrid bearings | fHC | 1 |
| Limiting value | e | 0.68 |
| Axial load factor (single, tandem) | Y1 | 0 |
| Axial load factor (single, tandem) | Y2 | 0.87 |
| Axial load factor (single, tandem) | Y0 | 0.38 |
| Radial load factor (single, tandem) | X1 | 1 |
| Radial load factor (single, tandem) | X2 | 0.41 |
| Radial load factor (single, tandem) | X0 | 0.5 |
| 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) | X1 | 1 |
| Radial load factor (back-to-back, face-to-face) | X2 | 0.67 |
| Radial load factor (back-to-back, face-to-face) | X0 | 1 |
Mass
| Mass | 1.59 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.
