Tandem bearing arrangement (also known as “DT arrangement”) is a type of duplex bearing arrangement where the two half are placed so that contact angle lines are parallel.

In a back-to-back arrangement, the load lines diverge along the bearing axis. Axial loads acting in both directions can be accommodated, but only by one bearing or bearing set in each direction. Bearings mounted back-to-back provide a relatively rigid bearing arrangement. The wide span between bearing effective centres makes this arrangement particularly well suited to support moment loads.