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) |
No
|
| d |
25 mm
|
Bore diameter |
|---|---|---|
| D |
37 mm
|
Outside diameter |
| B |
21 mm
|
Width |
| d1 |
29.1 mm
|
Shoulder diameter of inner ring (large side face) |
| r1,2 |
min. 0.3 mm
|
Chamfer dimension |
| r3,4 |
min. 0.15 mm
|
Chamfer dimension |
| da |
min. 27 mm
|
Diameter of shaft abutment |
|---|---|---|
| Db |
max. 36.2 mm
|
Diameter of housing abutment |
| ra |
max. 0.3 mm
|
Radius of fillet |
| rb |
max. 0.15 mm
|
Radius of fillet |
| dn |
29.5 mm
|
Position of oil nozzle |
| Basic dynamic load rating | C |
8 520 N
|
|---|---|---|
| Basic static load rating | C0 |
9 150 N
|
| Fatigue load limit | Pu |
380 N
|
| Attainable speeds |
Contact SKF for the attainable speeds
|
|
| Contact angle | α |
25 °
|
| Ball diameter | Dw |
3.175 mm
|
| Number of rows | i |
3
|
| Number of balls (per bearing) | z |
20
|
| Reference grease quantity (per bearing) | Gref |
0.21 cm³
|
| Preload class |
F
|
|
| Preload | G |
210 N
|
| Axial stiffness |
160 N/µm
|
| Mass |
0.063 kg
|
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