An installation for sequential loading of bars of material in a machining center includes a frame, a first device, and a second device. The frame includes at least one first arcuate bearing surface and at least one second arcuate bearing surface connected to the first bearing surface at a first station. The first device includes a first elongated body having a peripheral first face engaging the at least one first bearing surface and a plurality of first longitudinal cavities in the first face. The first elongated body is configured to rotate such that the first bearing surface blocks an opening of the first longitudinal cavities between a first position where a bar is loaded into the first longitudinal cavity and a second position where a bar exits the first longitudinal cavity at the first station.