7021 CD/P4A
Super-precision, high-capacity, single row angular contact ball bearing
These super-precision, high-capacity, single row angular contact ball bearings, with 15° 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 |
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) |
| r1,2 |
min.2 mm
|
Chamfer dimension |
| r3,4 |
min.1 mm
|
Chamfer dimension |
| a |
30.8 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 |
| dn |
125.6 mm
|
Position of oil nozzle |
Calculation data
| Basic dynamic load rating |
C |
95.6 kN
|
| Basic static load rating |
C0 |
96.5 kN
|
| Fatigue load limit |
Pu |
3.6 kN
|
| Attainable speed for grease lubrication |
|
8 000 r/min
|
| Attainable speed for oil-air lubrication |
|
13 000 r/min
|
| Contact angle |
α |
15 °
|
| Ball diameter |
Dw |
17.462 mm
|
| Number of rows |
i |
1
|
| Number of balls (per bearing) |
z |
21
|
| Reference grease quantity (per bearing) |
Gref |
20.4 cm³
|
Preload and stiffness (back-to-back, face-to-face)
| Preload, class A |
GA |
360 N
|
| Axial stiffnes for preload A (sets of two brgs back to back or face to face) |
|
117 N/µm
|
| Preload, class B |
GB |
720 N
|
| Axial stiffness for preload B (sets of two brgs back-to-back or face-to-face) |
|
159 N/µm
|
| Preload, class C |
GC |
1 440 N
|
| Axial stiffness for preload C (sets of two brgs back-to-back or face-to-face) |
|
223 N/µm
|
| Preload, class D |
GD |
2 880 N
|
| Axial stiffness for preload D (sets of two brgs back-to-back or face-to-face) |
|
324 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 |
1
|
| 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
| Calculation factor for equivalent loads |
f0 |
15.7
|
