Replaceable tool head having serrated coupling portions and a tool holder therefor

A tool head (10, 210, 310) having a longitudinal tool head axis (L) extending in a rearward to forward direction (DR, DF), a vertical tool head axis (V) perpendicular to the longitudinal tool head axis (L) and extending in an upward to downward direction (DU, DD), a forward end (20), and a rearward end (36) located opposite the forward end (20);

• the tool head (10, 210, 310) comprising:
• a top surface (12), a bottom surface (14), and a peripheral surface (16) extending therebetween, the peripheral surface (16) comprising:
• first and second side walls (22, 26) located on opposite sides of the longitudinal tool head axis (L) in a top view of the tool head (10), the first side wall (22) having a first serrated portion (24) and the second side wall (26) having a second serrated portion (28);
• a stopper wall (30, 30′) facing in the rearward direction (DR) and extending transversely to the second side wall (26), the stopper wall (30) having a stopper serrated portion (32);
• and
• a rear wall (34) extending between the first side wall (22) and the second side wall (26), at the rearward end (36) of the tool head (10);
• an insert retaining portion (17) comprising an insert seat (18) located at an intersection of the top surface (12) and the peripheral surface (16);
• and
• a coupling portion (19) connected to the insert retaining portion (17) and comprising rearwardly extending top and bottom coupling arms (40, 42) which are spaced apart from one another along the vertical axis (V) by a coupling recess (38) which opens out to the rear wall (34) at the rearward end (36).