an apparatus for making elongated headed workpieces having a conveyor device for successively transporting elongated workpieces such as wire pieces transversely to their longitudinal axes from one treatment station into at least one treatment station and including a guided conveyor belt assembly to which the workpieces may be clamped by their circumferential surfaces . two sections , running together and side by side , of two conveyor belts are guided in such a manner between the stations that they remain in immovable contact on both sides with the transported workpieces . at least one of the two conveyor belts is a toothed belt in which the gaps between the teeth take up the workpieces singly .