Alignment needle roller bearings are self-aligning and offer a compact solution in applications where less space is available. Owing to their large number of rollers, they have a high load carrying capacity. Their internal design, where a convex outer ring meets two concave seating rings encased in a drawn sleeve, enables the bearings to compensate for initial errors of alignment. Bearings with an inner ring are used for applications where the shaft cannot be hardened and ground.
| Designation |
PNA 12/28
|
| d |
12 mm
|
Bore diameter |
|---|---|---|
| D |
28 mm
|
Outside diameter |
| B |
12 mm
|
Width |
| F |
15 mm
|
Raceway diameter inner ring |
| D1 |
24.5 mm
|
Shoulder diameter sleeve |
| r |
min. 0.8 mm
|
Chamfer dimension sheet steel sleeve |
| r1,2 |
min. 0.3 mm
|
Chamfer dimension inner ring |
| s |
max. 0.5 mm
|
Permissible axial displacement from the normal position of one bearing ring relative to the other |
| da |
min. 14 mm
|
Smallest permissible abutment diameter shaft |
|---|---|---|
| Da |
min. 23.5 mm
|
Smallest permissible abutment diameter housing |
| Da |
max. 24.5 mm
|
Largest permissible abutment diameter housing |
| ra |
max. 0.8 mm
|
Fillet radius |
| rb |
max. 0.3 mm
|
Fillet radius |
| Basic dynamic load rating | C |
7.37 kN
|
|---|---|---|
| Basic static load rating | C0 |
9.15 kN
|
| Fatigue load limit | Pu |
1.08 kN
|
| Reference speed |
24 000 r/min
|
|
| Limiting speed |
28 000 r/min
|
| Mass bearing |
0.037 kg
|
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