This type of bearing is specially designed for the screw down mechanism of rolling mill. The bearing has no cage and the roller is full of raceway, so it can bear extremely large unidirectional axial load.

This type of bearing can be divided into ttsx type with convex spherical ring and TTSV type with concave spherical ring. Because the axle ring is spherical, all the screwdown mechanisms can ensure the bearing force is even when the axis of the roller seat is inclined.