<p>The milling tool assembly has a tool head (2) provided with an outer bearing ring (3). A fixed retainer (4) for drive shaft (6) is arranged coaxially with respect to outer bearing ring. Several supporting rings (7-9) are arranged coaxially between the outer ring and fixed retainer and are connected with one another by threaded screws (11-13). The pressure screws (16-18) are provided in circumference of rings so as to fix with a bottom (24) of the tool head.</p>
