Angular contact ball bearings can bear both radial and axial loads. It can work at high speed. The larger the contact angle is, the higher the axial bearing capacity is. The contact angle is the angle between the contact line of the ball and raceway in the radial plane and the vertical line of the bearing axis. High precision and high-speed bearings usually have a 15 degree contact angle. Under the action of axial force, the contact angle will increase.