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 |
260 mm
|
Bore diameter |
|---|---|---|
| D |
400 mm
|
Outside diameter |
| B |
104 mm
|
Width |
| d1 |
312.8 mm
|
Shoulder diameter inner ring (NN design) |
| E |
364 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) |
| da |
min. 276 mm
|
Abutment diameter shaft |
|---|---|---|
| Da |
min. 367 mm
|
Abutment diameter housing |
| Da |
max. 384 mm
|
Abutment diameter housing |
| ra |
max. 3 mm
|
Fillet radius |
| dn |
355.2 mm
|
Oil nozzle position (not for variants with TNHA cage) |
| Basic dynamic load rating | C |
1 020 kN
|
|---|---|---|
| Basic static load rating | C0 |
1 930 kN
|
| Fatigue load limit | Pu |
183 kN
|
| Attainable speed for grease lubrication |
2 000 r/min
|
|
| Attainable speed for oil-air lubrication |
2 400 r/min
|
|
| Reference grease quantity | Gref |
392 cm³
|
| Static radial stiffness (guideline value) |
5 570 N/µm
|
| Mass bearing |
45.3 kg
|
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