This is a dataset that was used for the PHM IEEE 2012 Data Challenge. It used to be online at http://www.femto-st.fr/en/Research-departments/AS2M/Research-groups/PHM/IEEE-PHM-2012-Data-challenge.php, but isn't anymore.

The set contains a training set of 6 rolling bearings that were operated in three different conditions, and a testing set of 11 more. See the added PDF file for all the info of the challenge and the set.

I don't know if there was any license to this, but always cite using below citation. There is a BibTeX entry in the PDF file.

Nectoux, P., Gouriveau, R., Medjaher, K., Ramasso, E., Chebel-Morello, B., Zerhouni, N., … Varnier, C. (2012). PRONOSTIA : An experimental platform for bearings accelerated degradation tests. In IEEE International Conference on Prognostics and Health Management (pp. 1–8). Denver.