Single Row Bearings: have internal raceways that are effectively opposite each other, they are designed to accommodate both axial and radial loads and when used in pairs have a tremendous load bearing capacity. Single Row bearings are designed for rigid, high speed, high tolerance applications. Spindle bearings used in pairs in a 'back to back' or 'face to face' arrangemet can support axial forces on both directions and moments. Bearings in a tandem arrangement can only support axial loads in one direction. Spindle bearings are available with a 15 degree or 25 degreee contact angle. Various cage options are available as well as the use of ceramic balls which allow for higher speed, lower friction and heat generation and a longer operating life.
Double Row Bearings: are used in applications where there are high radial loads, low speeds and where thrust loads are comparatively low. Design of two single row angular contact ball bearings side by side but occupying less space. They can accommodate radial loads as well as axial loads acting in both directions. They provide a rigid bearing arrangement and accommodate tilting moments well.