Such type of bearings are specially designed for rolling mill screwdown mechanism, there are no cage for bearings, roller full complement raceway. They can bear especially big unidirectional axial load.These kinds of bearings include two structural types of TTSX with shaft washer being convex spherical shape and TTSV with shaft washer being concave spherical shape. Because shaft washer is spherical, certain inclination is produced for axis when screwdown mechanism presses down roll housing, which also can guarantee bearings be uniformly stressed.