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Double direction angular contact thrust ball bearings were developed by SKF to axially locate machine tool spindles in both directions. In these applications, a high degree of system rigidity is one of the main performance challenges, as the magnitude of elastic deformation under load determines the productivity and accuracy of the equipment. SKF has developed a new generation of double direction angular contact thrust ball bearings, order to move on with the challenges of precision application. These super-precision bearings in the BTM series have a new and optimized design, enabling them to accommodate higher speeds. Their ability among others to provide a high degree of rigidity and accommodate heavy loads at high speeds, are beneficial for a variety of applications.