7021 ACD/P4ADGB
Matched set of two super-precision, high-capacity, D design, single row angular contact ball bearings
These matched sets of two super-precision, high-capacity, D design, single row angular contact ball bearings are available in a variety of arrangements.
They are designed for high-load capacity and relatively high speed operation and, compared to the equivalent SKF B and E design high-speed bearings, are best suited for heavier loads.
- Very high running accuracy
- Very high load carrying capacity
Dimensions
| d |
105 mm
|
Bore diameter |
| D |
160 mm
|
Outside diameter |
| B |
52 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 |
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 |
148 kN
|
| Basic static load rating |
C0 |
186 kN
|
| Fatigue load limit |
Pu |
6.8 kN
|
| Attainable speed for grease lubrication |
|
To be calculated: Single bearing (7500) x speed reduction factor (see table below)
|
| Attainable speed for oil-air lubrication |
|
To be calculated: Single bearing (12000) x speed reduction factor (see table below)
|
| Contact angle |
α |
25 °
|
| Ball diameter |
Dw |
17.462 mm
|
| Number of rows |
i |
2
|
| 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 |
|
B
|
| Preload |
G |
1 120 N
|
| Axial stiffness |
|
365 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 B |
f2B |
1
|
| Correction factor for hybrid bearings |
fHC |
1
|
Factors for equivalent bearing load calculation
| Calculation factor |
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 |
1.4
|
| 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
|
