Ultra-precision bi-directional angular contact ball bearings are used for bi-directional axial positioning on machine tool spindles. They can withstand bi-directional axial forces and are available in two main designs: BTW (basic series bearings, which can withstand high axial loads) and BTM (high speed series bearings, which can withstand high speeds).

• Very high running accuracy
• High bi-directional axial load carrying capacity
• High axial stiffness
• Two main designs with high load carrying capacity or stiffness and rotational speeds