YRT series turntable precision bearing for rotation precision are comprised of three rows of crossed rollers, two of which accommodate axial loads and the other radial ones, housed in bronze cages. They are manufactured according to market standards and are constructed entirely in 100Cr6 through hardened steel; all inner and outer surfaces are finely ground to achieve micrometric rotation precision. The preloaded, triple roller row construction is comprised of three rings, one of which is an outer monolithic ring and two of which form the inner ring, bound together with screws. A very deep outer and inner fixing hole is used for coupling, with extremely precise centring diameters. 

Slewing bearings for precision rotation in the YRT standard series distribute the load across the three rows of rollers in the same way and in the directions in which the load is applied, without angular decomposition. This allows the three row structure to counter-balance a high number of tilting moments, with micrometric deflection.