Super-Precision Contact Ball Bearings Duplex Bearing Arrangements - Back to Back, Face to Face and Tandem

With rigid bearing preload, adjusted bearing pairs in back-to-back, face-to-face or tandem arrangement offer an effective, economic and technical solution for a variety of applications.

Duplex bearing 0 () arrangement: Back to back (designation -1 and DB for spindle bearings)

With this bearing configuration the inner rings are designed to be clamped together. The contactangle load path between the outer ring raceway, the ball and the inner ring curvature diverge,which results in maximum stability and stiffness against any moment loading. Radial and axial loads can be taken in both directions.

Duplex bearing X (><) arrangement: Face to face (designation -2 and DF for spindle bearings)

With this bearing configuration, the inner rings are designed to be clamped together. The loadpath converges resulting in less stability and a lower stiffness against moment loading. This design more easily compensates any misalignment of the assembly. Radial and axial loads canlikewise be taken in both directions.

Duplex bearing Tandem (>>) or (<<) arrangement (designation -3 and DT for spindle bearings)

Duplex bearings in 0- and X- configurations are designed to accommodate axial loading in bothdirections. The tandem-mounted bearing design is capable of taking a significantly higher axial load, but only in one direction. With this type of bearing, preloading and control of axial play canonly be achieved by preloading against another bearing.

Please note that bearings of these pairing types are packed in pairs or sets and must not be mixed.

Duplex bearing Universal Tandem arrangement (designation -4 and DT for spindle bearings)

Universally matched bearing pairs have a significant advantage compared to the duplexeddesigns described above. They are individually ground in such a way that they can be assembled in various pairing configurations, e.g. X, 0, or tandem; without any loss in performance. With the same preload, these single bearings can be interchanged without any problems.

Bearing Sets

Multiple duplexed bearing configurations may be used together to get the desired results. Depending on the application, thesebearing sets can be made up of universally paired bearings in X, 0, or tandem configurations.

The table below shows some examples of possible configurations in more detail: