Appts for radial and axial adjustment of an extrusion nozzle core and sleeve. G1-. for an extruder head used to produce tubular parisons for blow moulding thermoplastic articles, consisting of a housing in which the nozzle sleeve is adjustably secured and surrounds the axially adjustable nozzle core and in which a sliding element can be moved transversely to the nozzle ring axis, and is rotatably connected in turn to a second element moveable in a direction perpendicular to that of the first element, and retains the nozzle sleeve, being locally fixed in such a way that the sliding motion of the first element and rotary motion of the second elect enable the position of the nozzle sleeve to the adjusted with respect to the extrusion head.
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