SKF 71902 ACE-P4A Angular contact ball bearings, super-precision
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Description
SKF 71902 ACE-P4A specification parameter：
DIMENSIONS
| d |
15 mm
|
|
|---|---|---|
| D |
28 mm
|
|
| B |
7 mm
|
|
| d1 |
19.1 mm
|
|
| d2 |
18.1 mm
|
|
| D1 |
23.9 mm
|
|
| r1,2 |
min. 0.3 mm
|
|
| r3,4 |
min. 0.15 mm
|
|
| a |
9.1 mm
|
ABUTMENT DIMENSIONS
| da |
min. 17 mm
|
|
|---|---|---|
| db |
min. 17 mm
|
|
| Da |
max. 26 mm
|
|
| Db |
max. 27.2 mm
|
|
| ra |
max. 0.3 mm
|
|
| rb |
max. 0.15 mm
|
|
| dn |
20 mm
|
CALCULATION DATA
| Basic dynamic load rating | C |
3.02 kN
|
|---|---|---|
| Basic static load rating | C0 |
1.34 kN
|
| Fatigue load limit | Pu |
0.057 kN
|
| Attainable speed for grease lubrication |
68000 r/min
|
|
| Attainable speed for oil-air lubrication |
106000 r/min
|
|
| Contact angle | α |
25 °
|
| Ball diameter | Dw |
3.969 mm
|
| Number of balls | z |
12
|
| Reference grease quantity | Gref |
0.2 cm³
|
| Preload class A | GA |
28 N
|
|---|---|---|
| Static axial stiffness, preload class A |
34 N/µm
|
|
| Preload class B | GB |
84 N
|
| Static axial stiffness, preload class B |
51 N/µm
|
|
| Preload class C | GC |
170 N
|
| Static axial stiffness, preload class C |
66 N/µm
|
| Calculation factor | f |
1.04
|
|---|---|---|
| Calculation factor | f1 |
0.99
|
| Calculation factor | f2A |
1
|
| Calculation factor | f2B |
1.04
|
| Calculation factor | f2C |
1.07
|
| Calculation factor | fHC |
1
|
| Calculation factor | e |
0.68
|
| Calculation factor (single, tandem) | Y2 |
0.87
|
| Calculation factor (single, tandem) | Y0 |
0.38
|
| Calculation factor (single, tandem) | X2 |
0.41
|
| Calculation factor (back-to-back, face-to-face) | Y1 |
0.92
|
| Calculation factor (back-to-back, face-to-face) | Y2 |
1.41
|
| Calculation factor (back-to-back, face-to-face) | Y0 |
0.76
|
| Calculation factor (back-to-back, face-to-face) | X2 |
0.67
|
MASS
| Mass bearing |
0.015 kg
|
|---|
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