Angular Contact Thrust Ball Bearings are specially designed high precision bearings for the main spindles of machine tools. Compared with the Thrust Ball Bearings in the 511 series, this type contains more balls of smaller diameter and has a contact angle of 60°. Angular Contact Thrust Ball Bearings are designed to support the rotary tables of drilling rigs but are also suitable for other applications where high load carrying capacity, high axial stiffness and low friction torque are important.