Nozzle for an exhaust gas turbine

The nozzle ring has an inner ring (72) and an outer ring (71) and several guide vanes (70) fixed between the inner ring and the outer ring. The guide vanes are partially arranged at different distances to one another. One of the two rings is provided with a positioning unit (75) to define the position of the nozzle ring relative to the gas inlet casing that clearly leaves, when positioning unit is inserted into the corresponding gas inlet casing in the axial direction. An independent claim is included for axial flow turbine of supercharger.