NJ 311 ECM
Single row cylindrical roller bearing, NJ design
Single row cylindrical roller bearings are designed to accommodate high radial loads in combination with high speeds.
Having two integral flanges on the outer ring and one on the inner ring, NJ design bearings can accommodate axial displacement in one direction. An important feature is the separable design, which facilitates mounting and enables the bearing components to be interchanged.
- High radial load carrying capacity
- Low friction
- Long service life
- Locate the shaft axially in one direction
- Separable design
Dimensions
| d |
55 mm
|
Bore diameter |
| D |
120 mm
|
Outside diameter |
| B |
29 mm
|
Width |
| d1 |
≈77.5 mm
|
Shoulder diameter of inner ring |
| D1 |
≈100.3 mm
|
Shoulder diameter of outer ring |
| F |
70.5 mm
|
Raceway diameter of inner ring |
| r1,2 |
min.2 mm
|
Chamfer dimension |
| r3,4 |
min.2 mm
|
Chamfer dimension |
| s |
max.2 mm
|
Permissible axial displacement |
Abutment dimensions
| da |
min.65 mm
|
Diameter of spacer sleeve |
| da |
max.68 mm
|
Diameter of spacer sleeve |
| db |
min.80 mm
|
Diameter of shaft abutment |
| Da |
max.109.2 mm
|
Diameter of housing abutment |
| ra |
max.2 mm
|
Radius of fillet |
Calculation data
| SKF performance class |
|
SKF Explorer
|
| Basic dynamic load rating |
C |
156 kN
|
| Basic static load rating |
C0 |
143 kN
|
| Fatigue load limit |
Pu |
18.6 kN
|
| Reference speed |
|
6 000 r/min
|
| Limiting speed |
|
7 000 r/min
|
| Minimum load factor |
kr |
0.15
|
| Limiting value |
e |
0.2
|
| Calculation factor |
Y |
0.6
|
