These sets of four matched super-precision angular contact ball bearings are available as universally matchable bearings or in preconfigured arrangements. Sets of four bearings arranged in tandem need to be mounted against a single bearing, or a set of bearings in tandem, to achieve the desired preload. All the other arrangements are available in different preload classes and correct mounting results in preload within a predetermined range, without the need for shims or similar devices. The bore and outside diameters of the bearings are matched to within a maximum of one-third of the permitted diameter tolerance, to provide better load distribution than single universally matchable bearings.
| Universal matching bearing(s) |
No
|
| d |
30 mm
|
Bore diameter |
|---|---|---|
| D |
55 mm
|
Outside diameter |
| B |
52 mm
|
Width |
| d1 |
37.7 mm
|
Shoulder diameter of inner ring (large side face) |
| r1,2 |
min. 1 mm
|
Chamfer dimension |
| r3,4 |
min. 0.3 mm
|
Chamfer dimension |
| da |
min. 34.6 mm
|
Diameter of shaft abutment |
|---|---|---|
| Db |
max. 53 mm
|
Diameter of housing abutment |
| ra |
max. 1 mm
|
Radius of fillet |
| rb |
max. 0.3 mm
|
Radius of fillet |
| dn |
39.3 mm
|
Position of oil nozzle |
| Basic dynamic load rating | C |
36 400 N
|
|---|---|---|
| Basic static load rating | C0 |
30 500 N
|
| Fatigue load limit | Pu |
1 290 N
|
| Attainable speeds |
Contact SKF for the attainable speeds
|
|
| Contact angle | α |
25 °
|
| Ball diameter | Dw |
7.938 mm
|
| Number of rows | i |
4
|
| Number of balls (per bearing) | z |
14
|
| Reference grease quantity (per bearing) | Gref |
1.59 cm³
|
| Preload class |
C
|
|
| Preload | G |
720 N
|
| Axial stiffness |
266 N/µm
|
| Correction factor dependent on bearing series and size | f |
1.06
|
|---|---|---|
| Correction factor dependent on contact angle | f1 |
0.99
|
| Correction factor, preload class C | f2C |
1.05
|
| Correction factor for hybrid bearings | fHC |
1
|
| Mass |
0.45 kg
|
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