A bearing component part for use in a diffusion welding process, comprising a core part presenting a first circumferential surface, at least one annular part presenting a second circumferential surface, wherein the core part and the annular part are attached to and along each other in a circumferential manner through their first circumferential surface and second circumferential surface. The at least one annular part is substantially u-shaped in a cross sectional view, comprising two opposing sides connected by a base side together forming a space. The at least one annular part is arranged to receive a first material in the space formed by the u-shape.