A workholding apparatus (2) having jaws (5) comprising interchangeable adapter blocks (12) that enable a single workholding apparatus (2) to accommodate workpieces (22) having a range of inner bore diameters.

Provided is ram clamping system (100) comprising a rotationally symmetrical main body (110), which has an opening that passes through the rotationally symmetrical main body (110) along its axis of symmetry, in which opening a drawbar (140) extends, comprising a collet (120) which can be clamped by means of the drawbar (140) for fixing a ram (190) associated with the ram clamping system (100), and comprising an exchangeable holder (180), through the interior (181) of which the ram (190) passes before entering the collet (120), wherein at least one portion of the collet (120) projects in the direction of extension of the drawbar (140) beyond the end face of the main body (110), on which end face the exchangeable holder (180) is arranged, and enters the interior (181) of the exchangeable holder (180).