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.
| Bore type |
Cylindrical
|
| d |
90 mm
|
Bore diameter |
|---|---|---|
| D |
140 mm
|
Outside diameter |
| B |
37 mm
|
Width |
| d1 |
109.4 mm
|
Shoulder diameter inner ring (NN design) |
| E |
127 mm
|
Raceway diameter outer ring (NN design) |
| b |
5.5 mm
|
Width annular lubrication groove at outer ring |
| K |
3 mm
|
Diameter lubrication hole (outer ring) |
| r1,2 |
min. 1.5 mm
|
Chamfer dimension outer ring |
| s |
max. 2 mm
|
Permissible axial displacement from the normal position of one bearing ring relative to the other (all) |
| da |
min. 98 mm
|
Abutment diameter shaft |
|---|---|---|
| Da |
min. 129 mm
|
Abutment diameter housing |
| Da |
max. 132 mm
|
Abutment diameter housing |
| ra |
max. 1.5 mm
|
Fillet radius |
| dn |
125.4 mm
|
Oil nozzle position (not for variants with TNHA cage) |
| Basic dynamic load rating | C |
138 kN
|
|---|---|---|
| Basic static load rating | C0 |
216 kN
|
| Fatigue load limit | Pu |
26 kN
|
| Attainable speed for grease lubrication |
6 300 r/min
|
|
| Attainable speed for oil-air lubrication |
7 000 r/min
|
|
| Reference grease quantity | Gref |
11.1 cm³
|
| Static radial stiffness (guideline value) |
2 010 N/µm
|
| Mass bearing |
1.93 kg
|
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