Cutting tool having clamping bolt provided with locking portion and cutting insert therefor

A cutting tool (20) comprising a cutting insert (22) removably securable in a tool shank (24) by means of a clamping bolt (26);

• the tool shank (24) extending along a longitudinal axis (A1), and having spaced apart first and second protuberances (28, 30) protruding from an end portion (32) thereof;
• the first protuberance (28) having a through bore (36) and the second protuberance (30) having a threaded bore (38), the through bore (36) and the threaded bore (38) extending coaxially along a bore axis (A2),
• the cutting insert (22) having a body portion (40) and a cutting portion (42);
• the body portion (40) having a cut-out (44) extending along a cut-out axis (A3) from a first side surface (46) to an opposing second side surface (48) and opening out to a bottom surface (50) extending therebetween, the cut-out (44) including at least one undercut (52), and
• the clamping bolt (26) having a bolt shank (60) extending away from a bolt head (62) along a bolt axis (A5);
• the bolt shank (60) having a threaded portion (64) distal from the bolt head (62) and at least one bolt locking portion (66),
• wherein:
• the first and second side surfaces (46, 48) are located between the first and second protuberances (28, 30), and each of the at least one undercut (52) has at least one undercut sub-surface (54) with respect to a forward direction (F), and
• wherein the clamping bolt (26) can be rotated about its bolt axis (A5);
• from a locked position wherein the threaded portion (64) is threadingly engaged in the threaded bore (38) and the at least one bolt locking portion (66) is located directly forward of the at least one undercut sub-surface (54) of one of the at least one undercut (52), to an un-locked position wherein the threaded portion (64) remains threadingly engaged in the threaded bore (38) and no portion of the bolt shank (60) is located directly forward of any of the at least one undercut sub-surface (54) of any of the at least one undercut (52).