NTN ball screw bearings are optimized to support a ball screw. There are several types, BST type is open type thrust angular contact ball bearings with 60 degree contact angle, generally used with grease lubrication. The BST type is mainly installed on ball screws of machine tool feed systems, and two to four row arrangements are used in many cases.
NTN bearing: BST30x62-1B
Dimension: 30mm x 62mm x 16mm
DF or DB type: 305 mm
DFT or DBT type: 420mm
DTFT or DTBT type: 615mm
DFTT or DBTT type: 470mm
The following are NTN ball screw support bearings production list,
| BST17X47-1B | BST17X47-1BLXL |
| 2A-BST17X47-1B | 2A-BST17X47-1BLXL |
| BST20X47-1B | BST20X47-1BLXL |
| 2A-BST20X47-1B | 2A-BST20X47-1BLXL |
| BST25X62-1B | BST25X62-1BLXL |
| 2A-BST25X62-1B | 2A-BST25X62-1BLXL |
| BST30X62-1B | BST30X62-1BLXL |
| 2A-BST30X62-1B | 2A-BST30X62-1BLXL |
| BST35X72-1B | BST35X72-1BLXL |
| 2A-BST35X72-1B | 2A-BST35X72-1BLXL |
| BST40X72-1B | BST40X72-1BLXL |
| 2A-BST40X72-1B | 2A-BST40X72-1BLXL |
| BST40X90-1B | BST40X90-1BLXL |
| 2A-BST40X90-1B | 2A-BST40X90-1BLXL |
| BST45X75-1B | BST45X75-1BLXL |
| 2A-BST45X75-1B | 2A-BST45X75-1BLXL |
| BST45X100-1BL | BST45X100-1BLXL |
| 2A-BST45X100-1BL | 2A-BST45X100-1BLXL |
| BST50X100-1BL | BST50X100-1BLXL |
| 2A-BST50X100-1B | 2A-BST50X100-1BLXL |
| BST55X100-1B | BST55X100-1BLXL |
| 2A-BST55X100-1B | 2A-BST55X100-1BLXL |
The above BST bearings are popular type, because greased sealed angular contact ball bearings are easy to handle, the back to back duplex arrangement is commonly used for that it allows acquisition of the specified preload by tightening the inner ring.