A chuck for gripping and moving cylindrical bodies, in particular fittings and pipe segments, comprising a main body defining an axis of rotation and a plurality of jaws fastened to said main body;
- said jaws being movable between a position of maximum closure, in which said jaws are at the minimum distance from said axis of rotation, to a position of maximum opening, in which said jaws are at the maximum distance from said axis of rotation;
- said chuck further comprising a means for adjusting said positions of maximum closure and maximum opening and a means for moving said jaws between said positions of maximum closure and maximum opening;
- said chuck further comprising a fixing means adapted to allow the axial fixing of said chuck to a support member and the connection of said chuck to said support member so that they are angularly rotatable with respect to each other.