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 |
70 mm
|
Bore diameter |
|---|---|---|
| D |
110 mm
|
Outside diameter |
| B |
60 mm
|
Width |
| d1 |
85 mm
|
Shoulder diameter of inner ring (large side face) |
| d2 |
83.2 mm
|
Shoulder diameter of inner ring (small side face) |
| D2 |
97.8 mm
|
Recess diameter of outer ring (large side face) |
| D4 |
99.99 mm
|
Recess diameter outer ring shoulder (small side face) |
| r1,2 |
min. 1.1 mm
|
Chamfer dimension |
| r3,4 |
min. 0.6 mm
|
Chamfer dimension |
| da |
min. 76 mm
|
Diameter of shaft abutment |
|---|---|---|
| db |
min. 76 mm
|
Diameter of shaft abutment |
| Da |
max. 104 mm
|
Diameter of housing abutment |
| Db |
max. 106.8 mm
|
Diameter of housing abutment |
| ra |
max. 1 mm
|
Radius of fillet |
| rb |
max. 0.6 mm
|
Radius of fillet |
| dn |
86.1 mm
|
Position of oil nozzle |
| Basic dynamic load rating | C |
39 000 N
|
|---|---|---|
| Basic static load rating | C0 |
46 500 N
|
| Fatigue load limit | Pu |
1 430 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 |
28
|
| Reference grease quantity (per bearing) | Gref |
7.27 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 |
1.07
|
|---|---|---|
| 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 |
1.88 kg
|
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