NN 3048 K/SPW33
Super-precision double row cylindrical roller bearing with tapered bore and lubrication feature
Super-precision double row cylindrical roller bearings in the NN 30 series provide a unique balance between load carrying capacity, rigidity and speed.
Having three flanges on the inner ring and no flanges on the outer ring, the bearings can accommodate axial displacement in both directions. The separable design simplifies mounting and dismounting, particularly when load conditions require both rings to have an interference fit. The tapered bore enables accurate adjustment of clearance or preload during mounting.
- Very high radial load carrying capacity
- High rigidity and high running accuracy
- Minimize noise, vibration and heat generation
- Accommodate axial displacement in both directions
- Lubrication feature
Dimensions
| d |
240 mm
|
Bore diameter |
| D |
360 mm
|
Outside diameter |
| B |
92 mm
|
Width |
| d1 |
285.2 mm
|
Shoulder diameter inner ring (NN design) |
| E |
330 mm
|
Raceway diameter outer ring (NN design) |
| b |
15.2 mm
|
Width annular lubrication groove at outer ring |
| K |
7.5 mm
|
Diameter lubrication hole (outer ring) |
| r1,2 |
min.3 mm
|
Chamfer dimension outer ring |
| r3,4 |
min.1.1 mm
|
Chamfer dimension inner ring (bearing with tapered bore) |
| s |
max.2 mm
|
Permissible axial displacement from the normal position of one bearing ring relative to the other (all) |
Abutment dimensions
| da |
min.253 mm
|
Abutment diameter shaft |
| Da |
min.333 mm
|
Abutment diameter housing |
| Da |
max.347 mm
|
Abutment diameter housing |
| ra |
max.2.5 mm
|
Fillet radius |
| dn |
322.5 mm
|
Oil nozzle position (not for variants with TNHA cage) |
Calculation data
| Basic dynamic load rating |
C |
842 kN
|
| Basic static load rating |
C0 |
1 560 kN
|
| Fatigue load limit |
Pu |
153 kN
|
| Attainable speed for grease lubrication |
|
2 200 r/min
|
| Attainable speed for oil-air lubrication |
|
2 600 r/min
|
| Reference grease quantity |
Gref |
288 cm³
|
| Static radial stiffness (guideline value) |
|
5 180 N/µm
|
