Milling tool for prosthetic surgery operations, comprising: a support part with a substantially hemispherical shape and made of metal, provided with a cutting part having a plurality of protruding cutting elements ; an attachment part made of metal and permanently connected to said support part by welding , an attachment head provided with clamping means being able to be selectively activated for a stable and releasable connection to said attachment part , said attachment head being able to be connected to a handling device , said attachment part being provided with a central connection seating , in order to allow a selectively releasable connection with said attachment head , wherein the attachment head comprises: a protruding annular bead which abuts against the attachment part , a connection portion projecting from the protruding annular bead characterised in that the central connection seating has a hexagonal shape and the connection portion has a hexagonal-shaped section, the clamping means comprises a magnetic element configured to selectively go into magnetic contact with the attachment part , in correspondence with the connection seating , wherein the attachment head comprises a throat , made on the protruding annular bead and circumscribed to the connection portion , and wherein the magnetic element is positioned in the throat . a support part with a substantially hemispherical shape and made of metal, provided with a cutting part having a plurality of protruding cutting elements ; an attachment part made of metal and permanently connected to said support part by welding , an attachment head provided with clamping means being able to be selectively activated for a stable and releasable connection to said attachment part , said attachment head being able to be connected to a handling device , said attachment part being provided with a central connection seating , in order to allow a selectively releasable connection with said attachment head , wherein the attachment head comprises: a protruding annular bead which abuts against the attachment part , a connection portion projecting from the protruding annular bead characterised in that the central connection seating has a hexagonal shape and the connection portion has a hexagonal-shaped section, the clamping means comprises a magnetic element configured to selectively go into magnetic contact with the attachment part , in correspondence with the connection seating , wherein the attachment head comprises a throat , made on the protruding annular bead and circumscribed to the connection portion , and wherein the magnetic element is positioned in the throat . a protruding annular bead which abuts against the attachment part , a connection portion projecting from the protruding annular bead the central connection seating has a hexagonal shape and the connection portion has a hexagonal-shaped section, the clamping means comprises a magnetic element configured to selectively go into magnetic contact with the attachment part , in correspondence with the connection seating , wherein the attachment head comprises a throat , made on the protruding annular bead and circumscribed to the connection portion , and wherein the magnetic element is positioned in the throat . <EOS>