BTM 120 ATN9/DBAVQ496
Super-precision, high-speed design double direction angular contact thrust ball bearing
These double direction angular contact thrust ball bearings consist of two non-separable single row angular contact ball bearings arranged back-to-back.
They accommodate axial loads in both directions and offer maximum speed capability. Compared to bearings in the basic design, BTW series, they have a 25% lower bearing height.
- Accommodate axial loads in both directions
- Maximum speed capability
- 30° contact angle for higher speeds or 40° contact angle for higher degree of axial rigidty
- Suitable for compact arrangements
Dimensions
| d |
120 mm
|
Bore diameter |
| D |
180 mm
|
Outside diameter |
| H |
54 mm
|
Bearing height |
| d1 |
147.7 mm
|
Shaft washer shoulder diameter (high shoulder) |
| D1 |
165 mm
|
Housing washer shoulder diameter (low shoulder) |
| r1,2 |
min.2 mm
|
Shaft washer chamfer radius |
| r3,4 |
min.1 mm
|
Housing washer small chamfer radius |
Abutment dimensions
| da |
min.129 mm
|
Shaft abutment diameter |
| Da |
max.175 mm
|
Housing abutment diameter |
| ra |
max.2 mm
|
Fillet radius |
| rb |
max.1 mm
|
Fillet radius |
| dn |
144.1 mm
|
Oil nozzle position |
Calculation data
| Basic dynamic load rating |
C |
58 500 N
|
| Basic static load rating |
C0 |
146 000 N
|
| Fatigue load limit |
Pu |
5 000 N
|
| Attainable speed for grease lubrication |
|
5 200 r/min
|
| Attainable speed for oil-air lubrication |
|
6 700 r/min
|
| Contact angle |
α |
30 °
|
| Ball diameter |
Dw |
12.7 mm
|
| Number of rows |
i |
2
|
| Number of balls (per bearing) |
z |
31
|
| Reference grease quantity, set |
Gref |
40 cm³
|
Preload and stiffness
| Preload |
|
600 N
|
| Axial stiffness |
|
377 N/µm
|
