Tool holder having coupling hole and locking through bore and rotary cutting tool provided with tool holder

A tool holder (24), having a holder longitudinal axis (D), extending in a forward to rearward direction (DF, DR) and about which the tool holder (24) is rotatable in a rotational direction (R), the tool holder (24) comprising:

• a holder peripheral surface (78) extending circumferentially about the holder longitudinal axis (D) and forming a boundary of a holder base surface (80) at a forward end of the tool holder (24);
• two circumferentially spaced apart driving members (84) extending forwardly from the holder base surface (80);
• a holder coupling hole (96) recessed in the holder base surface (80), the holder coupling hole (96) comprising a coupling hole peripheral surface (100) extending circumferentially about the holder longitudinal axis (D);
• and
• a holder through bore (102) comprising a bore peripheral surface (104) extending circumferentially along a holder through bore axis (B) and opening out to the coupling hole peripheral surface (100) to form a through bore inner opening (107A) and the holder peripheral surface (78) to form a through bore outer opening (107B);
• and
• a first holder longitudinal plane (LP1), extending parallel to the holder through bore axis (B) and containing the holder longitudinal axis (D);
• wherein:
• the holder through bore (102) is located entirely on one side of the first holder longitudinal plane (LP1).