These sets of three matched super-precision angular contact ball bearings are available as universally matchable bearings or as preconfigured arrangements. Sets arranged in back-to-back and tandem, or face-to-face and tandem, are available in different preload classes and correct mounting results in preload within a predetermined range, without the need for shims or similar devices. Sets of three bearings paired in tandem need to be mounted against a single bearing, or another set of bearings in tandem, to achieve the desired preload. 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) |
Yes, back-to-back (<>), face-to-face (><) or tandem (>>)
|
| d |
50 mm
|
Bore diameter |
|---|---|---|
| D |
80 mm
|
Outside diameter |
| B |
48 mm
|
Width |
| d1 |
60.25 mm
|
Shoulder diameter of inner ring (large side face) |
| d2 |
57.9 mm
|
Shoulder diameter of inner ring (small side face) |
| D1 |
69.75 mm
|
Shoulder diameter of outer ring (large side face) |
| K |
0.5 mm
|
Diameter of lubrication hole |
| C1 |
5.32 mm
|
Distance from outer ring side face to lubrication groove / lubrication hole |
| r1,2 |
min. 1 mm
|
Chamfer dimension |
| r3,4 |
min. 0.6 mm
|
Chamfer dimension |
| da |
min. 54.6 mm
|
Diameter of shaft abutment |
|---|---|---|
| db |
min. 54.6 mm
|
Diameter of shaft abutment |
| Da |
max. 75.4 mm
|
Diameter of housing abutment |
| Db |
max. 75.8 mm
|
Diameter of housing abutment |
| ra |
max. 1 mm
|
Radius of fillet |
| rb |
max. 0.6 mm
|
Radius of fillet |
| Basic dynamic load rating | C |
31 900 N
|
|---|---|---|
| Basic static load rating | C0 |
30 000 N
|
| Fatigue load limit | Pu |
930 N
|
| Attainable speeds |
Contact SKF for the attainable speeds
|
|
| Contact angle | α |
25 °
|
| Ball diameter | Dw |
7.938 mm
|
| Number of rows | i |
3
|
| Number of balls (per bearing) | z |
21
|
| Reference grease quantity (per bearing) | Gref |
4.1 cm³
|
| Preload class |
A
|
|
| Preload and stiffness |
Preload and stiffness depend on final arrangement. Contact SKF
|
| Correction factor dependent on bearing series and size | f |
1.08
|
|---|---|---|
| Correction factor dependent on contact angle | f1 |
0.99
|
| Correction factor, preload class A | f2A |
1
|
| Correction factor for hybrid bearings | fHC |
1.01
|
| Mass |
0.68 kg
|
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