NJ 18/630 ECMA/HB1
Single row cylindrical roller bearing, NJ designSingle 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
Description
Dimensions
| d | 630 mm | Bore diameter |
|---|---|---|
| D | 780 mm | Outside diameter |
| B | 69 mm | Width |
| d1 | ≈ 682 mm | Shoulder diameter of inner ring |
| D1 | ≈ 724 mm | Shoulder diameter of outer ring |
| F | 667 mm | Raceway diameter of inner ring |
| r1,2 | min. 4 mm | Chamfer dimension |
| s | max. 1.5 mm | Permissible axial displacement |
Abutment dimensions
| da | min. 645 mm | Diameter of spacer sleeve |
|---|---|---|
| da | max. 662 mm | Diameter of spacer sleeve |
| db | min. 685 mm | Diameter of shaft abutment |
| Da | max. 765 mm | Diameter of housing abutment |
| ra | max. 3 mm | Radius of fillet |
Calculation data
| Basic dynamic load rating | C | 1 100 kN |
|---|---|---|
| Basic static load rating | C0 | 2 500 kN |
| Fatigue load limit | Pu | 183 kN |
| Reference speed | 750 r/min | |
| Limiting speed | 950 r/min | |
| Minimum load factor | kr | 0.1 |
| Limiting value | e | 0.2 |
| Calculation factor | Y | 0.6 |
Mass
| Mass | 75 kg |
Tolerances and clearances
Bearing interfaces
