Method of manufacturing fasteners

A method for manufacturing a fastener of a first geometry and having an internal cavity, comprising the steps of:

• providing a blank of a second geometry different from said first geometry, said blank having an end face extending transversely to a central axis of said blank;
• providing a pair of rolling die means defining a rolling gap of a cross-section which continuously changes from a profile corresponding to said second geometry to a profile corresponding to said first geometry;
• and
• subjecting said blank to a rolling process in said rolling gap such that said blank performs a rolling movement about its central axis relative to said pair of rolling die means, with said end face of said blank remaining in contact with an axially fixed abutment surface of said rolling gap, in order to cause material of the blank to flow from said end face substantially only in an axial direction away from said end face and a radial direction towards said central axis so as to increase the axial dimensions and decrease the radial dimensions of said blank to obtain the finished fastener of said first geometry.