NRT 850 A
Axial-radial cylindrical super-precision roller bearingAxial-radial cylindrical super-precision roller bearings can accommodate radial loads, axial loads in both directions and moment loads, whether acting singly, or simultaneously, in any combination. With high running accuracy, high load capacity and rigidity, SKF super-precision axial radial cylindrical roller bearings are ideal for rotary tables, indexing heads, and multi spindle heads. The bearing minimizes noise, vibration and heat generation.
- Accommodate radial and axial loads in both directions
- Designed for low-medium speed performance
- Handle moment loads
- Close tolerances
- Minimizing noise, vibration and heat generation
Description
Dimensions
| d | 850 mm | Bore diameter |
|---|---|---|
| D | 1 095 mm | Outside diameter |
| H | 124 mm | Height |
| d1 | 1 018 mm | Shoulder diameter inner ring – large shoulder |
| C | 37 mm | Outer ring (housing washer) width |
| H1 | 80.5 mm | Distance |
| J | 890 mm | Inner ring (shaft/locating washer) hole pitch circle diameter |
| J1 | 1 055 mm | Outer ring (housing washer) hole pitch circle diameter |
| N | 18 mm | Inner ring (shaft/locating washer) through hole |
| N1 | 26 mm | Inner ring (shaft washer) sinkhole |
| N2 | 18 mm | Outer ring (housing washer) through hole |
| a | 17 mm | Inner ring (shaft washer) sinkhole depth |
| r1 | min. 1.5 mm | Outer ring (housing washer) chamfer dimension |
| r2 | min. 1.5 mm | Chamfer dimension |
Calculation data
| Basic dynamic load rating – radial direction | C | 473 kN |
|---|---|---|
| Basic static load rating – radial direction | C0 | 2 120 kN |
| Basic dynamic load rating – axial direction | C | 415 kN |
| Basic static load rating – axial direction | C0 | 6 400 kN |
| Attainable speed for grease lubrication | 40 r/min | |
| Attainable speed for oil-air lubrication | 80 r/min | |
| Axial preload | 47 kN | |
| Axial unloading force | 103 kN | |
| Frictional moment | CRL | 300 N·m |
| Axial stiffness for preload A (sets of two brgs back-to-back or face-to-face) | 77 000 000 kN/µm | |
| Axial stiffness for preload B (sets of two brgs back-to-back or face-to-face) | 22 400 000 kN/µm | |
| Moment stiffness | 7 011 kN·m/mrad |
Mass
| Mass bearing | 253 kg |
Rotary table
| Guideline rotary table diameter | 1 800 mm |
Mounting information
| Size | M16 | |
| Number of bolts | 2 | |
| Angle between bolts | 180 ° |
| Size | G | M16 |
|---|---|---|
| Number of threads | 6 | |
| Angle between threads | 60 ° |
| Bolt size | M16 | |
| Pitch | α | 6 ° |
| Number of bolts | 58 | |
| Number of bolts omitted at retaining bolts position | 2, 180° apart | |
| Tightening torque (Bolt grade 10.9) | 284 N·m |
| Bolt size | M16 | |
| Pitch | α | 6 ° |
| Number of bolts | 54 | |
| Number of bolts omitted at removal thread position | 6, 60° apart |
