The nozzle (8) is constituted by an assembly which is concentric with a central insert (9) is easily interchangeable, of an insert means (10) and a mounting block peripheral (11). The insert means (10) defines internally and externally of the rings of conduits of the internal heating (40) and (50) emerging around the central duct section of the cutting oxygen (12) formed in the central insert (9), and it comprises, at its rear end, at least two concentric annular transverse bearing surfaces (15, 16), cooperating in assembled configuration, in leaktight contact with an annular transverse end face (5) in the body of the torch (1) on which is attached to the nozzle (8). br / application in particular for cutting the slitting hot or cold.
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