A metal cutting head (100, 401, 421, 451, 481) having a cutting head longitudinal axis defining forward and rearward directions, the metal cutting head (100, 401, 421, 451, 481) comprising: a cap portion (118, 410, 430, 460, 618) comprising a plurality of head segments (140, 640) separated by at least first and second head flutes (138, 638), each head segment (140, 640) comprising a rearwardly facing head base surface (124, 624) formed at a rearward end of the cap portion (118, 410, 430, 460, 618); and a fixation portion (120, 412, 499, 620) joined to the cap portion (118, 410, 430, 460, 618) and extending in a rearward direction of the cutting head (100, 401, 421, 451, 481) the fixation portion (120, 412, 499, 620) comprising: a mounting stem (106, 404, 424, 454, 484, 606) connected to the cap portion (118, 410, 430, 460, 618); a bulge (108, 402, 422, 452, 482) formed on the mounting stem (106, 404, 424, 454, 484, 606), the bulge (108, 402, 422, 452, 482) comprising a plurality of circumferentially spaced apart protrusions, the protrusions defining a maximum dimension of the fixation portion (120, 412, 499, 620) in a direction perpendicular to the cutting head longitudinal axis; and a plurality of spaced apart head fixation surfaces (128, 406, 426, 456, 486) formed along the fixation portion (120, 412, 499, 620), characterised by each head fixation surface (128, 406, 426, 456, 486) being parallel to the cutting head longitudinal axis. a cap portion (118, 410, 430, 460, 618) comprising a plurality of head segments (140, 640) separated by at least first and second head flutes (138, 638), each head segment (140, 640) comprising a rearwardly facing head base surface (124, 624) formed at a rearward end of the cap portion (118, 410, 430, 460, 618); and a fixation portion (120, 412, 499, 620) joined to the cap portion (118, 410, 430, 460, 618) and extending in a rearward direction of the cutting head (100, 401, 421, 451, 481) the fixation portion (120, 412, 499, 620) comprising: a mounting stem (106, 404, 424, 454, 484, 606) connected to the cap portion (118, 410, 430, 460, 618); a bulge (108, 402, 422, 452, 482) formed on the mounting stem (106, 404, 424, 454, 484, 606), the bulge (108, 402, 422, 452, 482) comprising a plurality of circumferentially spaced apart protrusions, the protrusions defining a maximum dimension of the fixation portion (120, 412, 499, 620) in a direction perpendicular to the cutting head longitudinal axis; and a plurality of spaced apart head fixation surfaces (128, 406, 426, 456, 486) formed along the fixation portion (120, 412, 499, 620), characterised by each head fixation surface (128, 406, 426, 456, 486) being parallel to the cutting head longitudinal axis. a mounting stem (106, 404, 424, 454, 484, 606) connected to the cap portion (118, 410, 430, 460, 618); a bulge (108, 402, 422, 452, 482) formed on the mounting stem (106, 404, 424, 454, 484, 606), the bulge (108, 402, 422, 452, 482) comprising a plurality of circumferentially spaced apart protrusions, the protrusions defining a maximum dimension of the fixation portion (120, 412, 499, 620) in a direction perpendicular to the cutting head longitudinal axis; and a plurality of spaced apart head fixation surfaces (128, 406, 426, 456, 486) formed along the fixation portion (120, 412, 499, 620), characterised by each head fixation surface (128, 406, 426, 456, 486) being parallel to the cutting head longitudinal axis.