Abstract: The object of the present invention is a manufacturing process for a roller composed of a metal core covered by an elastomer coating and having an axis of symmetry, this process involving a first winding of a first non-vulcanized elastomer sheet onto the core, a vulcanization. This process is characterized in that it involves at least one stage consisting of doing a complementary winding, following the first winding and preceding vulcanization, winding at least one second sheet of non-vulcanized elastomer, the first sheet and the one or more second sheets being such that the hardnesses obtained after vulcanization are different. The object of the invention is also the monolithic elastomer roller with a heterogeneous hardness obtained by this process. Application to the making of rollers for sealed heads of textile thread processing machines.