NN 3056 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 |
280 mm
|
Bore diameter |
| D |
420 mm
|
Outside diameter |
| B |
106 mm
|
Width |
| d1 |
332.8 mm
|
Shoulder diameter inner ring (NN design) |
| E |
384 mm
|
Raceway diameter outer ring (NN design) |
| b |
15.3 mm
|
Width annular lubrication groove at outer ring |
| K |
7.5 mm
|
Diameter lubrication hole (outer ring) |
| r1,2 |
min.4 mm
|
Chamfer dimension outer ring |
| r3,4 |
min.1.5 mm
|
Chamfer dimension inner ring (bearing with tapered bore) |
| s |
max.5 mm
|
Permissible axial displacement from the normal position of one bearing ring relative to the other (all) |
Abutment dimensions
| da |
min.296 mm
|
Abutment diameter shaft |
| Da |
min.387 mm
|
Abutment diameter housing |
| Da |
max.404 mm
|
Abutment diameter housing |
| ra |
max.3 mm
|
Fillet radius |
| dn |
375.3 mm
|
Oil nozzle position (not for variants with TNHA cage) |
Calculation data
| Basic dynamic load rating |
C |
1 080 kN
|
| Basic static load rating |
C0 |
2 080 kN
|
| Fatigue load limit |
Pu |
196 kN
|
| Attainable speed for grease lubrication |
|
1 900 r/min
|
| Attainable speed for oil-air lubrication |
|
2 200 r/min
|
| Reference grease quantity |
Gref |
420 cm³
|
| Static radial stiffness (guideline value) |
|
6 010 N/µm
|
