Milling tool for prosthetic surgery operations, comprising: a support part (21, 32) with a substantially hemispherical shape and made of metal, provided with a cutting part (81, 82) having a plurality of protruding cutting elements; an attachment part made of metal and permanently connected to said support part (21, 32) 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 (21, 32) with a substantially hemispherical shape and made of metal, provided with a cutting part (81, 82) having a plurality of protruding cutting elements; an attachment part made of metal and permanently connected to said support part (21, 32) 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.