The face-to-face (TDI) configuration joins the load lines toward the axis, the back-to-back (TDO) configuration
separates the load lines toward the axis, and the tandem configuration sets the load lines parallel to one
another.

Unlike other types of anti-friction bearings, tapered roller bearings do not require tight control
of shaft or housing fits to obtain setting. Because tapered roller bearings are mounted in pairs.