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 |
30 mm
|
Bore diameter |
|---|---|---|
| D |
55 mm
|
Outside diameter |
| B |
19 mm
|
Width |
| d1 |
40.1 mm
|
Shoulder diameter inner ring (NN design) |
| E |
48.5 mm
|
Raceway diameter outer ring (NN design) |
| b |
3.8 mm
|
Width annular lubrication groove at outer ring |
| K |
2 mm
|
Diameter lubrication hole (outer ring) |
| r1,2 |
min. 1 mm
|
Chamfer dimension outer ring |
| r3,4 |
min. 0.6 mm
|
Chamfer dimension inner ring (bearing with tapered bore) |
| s |
max. 1.5 mm
|
Permissible axial displacement from the normal position of one bearing ring relative to the other (all) |
| da |
min. 35 mm
|
Abutment diameter shaft |
|---|---|---|
| Da |
min. 49 mm
|
Abutment diameter housing |
| Da |
max. 50 mm
|
Abutment diameter housing |
| ra |
max. 1 mm
|
Fillet radius |
| dn |
47.6 mm
|
Oil nozzle position (not for variants with TNHA cage) |
| Basic dynamic load rating | C |
30.8 kN
|
|---|---|---|
| Basic static load rating | C0 |
37.5 kN
|
| Fatigue load limit | Pu |
4 kN
|
| Attainable speed for grease lubrication |
17 000 r/min
|
|
| Attainable speed for oil-air lubrication |
19 000 r/min
|
|
| Reference grease quantity | Gref |
1 cm³
|
| Static radial stiffness (guideline value) |
690 N/µm
|
| Mass bearing |
0.18 kg
|
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