SX series crossed cylindrical roller bearings, under the same axial and radial conditions, the cross-sectional size of this type is smaller than that of the RB series. Due to the ultra-thin design, the outer ring and inner ring have no mounting holes, so installation is required. The flange and the support base are fixed.
https://www.efindbearing.com/cross-roller-bearing/sx011820-crossed-roller-bearings.html