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.
| Bore type |
Tapered 1:12
|
| d |
340 mm
|
Bore diameter |
|---|---|---|
| D |
520 mm
|
Outside diameter |
| B |
133 mm
|
Width |
| d1 |
408 mm
|
Shoulder diameter inner ring (NN design) |
| E |
473 mm
|
Raceway diameter outer ring (NN design) |
| F |
393 mm
|
Raceway diameter inner ring (NNU design) |
| b |
16.7 mm
|
Width annular lubrication groove at outer ring |
| K |
9 mm
|
Diameter lubrication hole (outer ring) |
| r1,2 |
min. 5 mm
|
Chamfer dimension outer ring |
| r3,4 |
min. 2.5 mm
|
Chamfer dimension inner ring (bearing with tapered bore) |
| s |
max. 10.9 mm
|
Permissible axial displacement from the normal position of one bearing ring relative to the other (all) |
| da |
min. 358 mm
|
Abutment diameter shaft |
|---|---|---|
| Da |
min. 477 mm
|
Abutment diameter housing |
| Da |
max. 502 mm
|
Abutment diameter housing |
| ra |
max. 4 mm
|
Fillet radius |
| Basic dynamic load rating | C |
1 650 kN
|
|---|---|---|
| Basic static load rating | C0 |
3 250 kN
|
| Fatigue load limit | Pu |
290 kN
|
| Attainable speed for grease lubrication |
1 400 r/min
|
|
| Attainable speed for oil-air lubrication |
1 500 r/min
|
|
| Static radial stiffness (guideline value) |
7 220 N/µm
|
| Mass bearing |
99 kg
|
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