7048 ACD/P4A
Super-precision, high-capacity, single row angular contact ball bearing
These super-precision, high-capacity, 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.
They are designed to accommodate heavy loads at relatively high speeds under low to moderate operating temperatures.
- Very high running accuracy
- Very high load carrying capacity
- Relatively high speed and stiffness
Dimensions
| d |
240 mm
|
Bore diameter |
| D |
360 mm
|
Outside diameter |
| B |
56 mm
|
Width |
| d1 |
277 mm
|
Shoulder diameter of inner ring (large side face) |
| d2 |
277 mm
|
Shoulder diameter of inner ring (small side face) |
| D1 |
323 mm
|
Shoulder diameter of outer ring (large side face) |
| r1,2 |
min.3 mm
|
Chamfer dimension |
| r3,4 |
min.1.5 mm
|
Chamfer dimension |
| a |
98.3 mm
|
Distance from side face to pressure point |
Abutment dimensions
| da |
min.253 mm
|
Diameter of shaft abutment |
| db |
min.253 mm
|
Diameter of shaft abutment |
| Da |
max.347 mm
|
Diameter of housing abutment |
| Db |
max.354 mm
|
Diameter of housing abutment |
| ra |
max.2.5 mm
|
Radius of fillet |
| rb |
max.1.5 mm
|
Radius of fillet |
| dn |
287 mm
|
Position of oil nozzle |
Calculation data
| Basic dynamic load rating |
C |
325 kN
|
| Basic static load rating |
C0 |
465 kN
|
| Fatigue load limit |
Pu |
11.4 kN
|
| Attainable speed for grease lubrication |
|
3 400 r/min
|
| Attainable speed for oil-air lubrication |
|
5 000 r/min
|
| Contact angle |
α |
25 °
|
| Ball diameter |
Dw |
38.1 mm
|
| Number of rows |
i |
1
|
| Number of balls (per bearing) |
z |
22
|
| Reference grease quantity (per bearing) |
Gref |
216 cm³
|
Preload and stiffness (back-to-back, face-to-face)
| Preload, class A |
GA |
2 050 N
|
| Axial stiffnes for preload A (sets of two brgs back to back or face to face) |
|
571 N/µm
|
| Preload, class B |
GB |
4 100 N
|
| Axial stiffness for preload B (sets of two brgs back-to-back or face-to-face) |
|
743 N/µm
|
| Preload, class C |
GC |
8 200 N
|
| Axial stiffness for preload C (sets of two brgs back-to-back or face-to-face) |
|
979 N/µm
|
| Preload, class D |
GD |
16 400 N
|
| Axial stiffness for preload D (sets of two brgs back-to-back or face-to-face) |
|
1 315 N/µm
|
Correction factors for preload calculation
| Correction factor dependent on bearing series and size |
f |
1.2
|
| Correction factor dependent on contact angle |
f1 |
0.99
|
| Correction factor, preload class A |
f2A |
1
|
| Correction factor, preload class B |
f2B |
1
|
| Correction factor, preload class C |
f2C |
1.1
|
| Correction factor, preload class D |
f2D |
1.1
|
| Correction factor for hybrid bearings |
fHC |
1
|
Factors for equivalent bearing load calculation
| 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 |
1.4
|
| Axial load factor (back-to-back, face-to-face) |
Y0 |
0.76
|
| Radial load factor (back-to-back, face-to-face) |
X2 |
0.67
|
