Patent ID: 8882413

Claim:
A cutting insert ( 102 ), having a longitudinal insert axis (A) extending in a forward (D F ) to rearward direction (D R ), comprising: a head portion ( 104 ) having two opposing major surfaces ( 106 ) and a head peripheral surface ( 108 ) extending therebetween, the head peripheral surface ( 108 ) including a base surface ( 110 ) at a rearward end ( 112 ) of the head portion ( 104 ), the base surface ( 110 ) defining a base plane (P 1 ) perpendicular to the insert axis (A); and a coupling portion ( 116 ) protruding rearwards from the base surface ( 110 ) along the insert axis (A), the coupling portion ( 116 ) comprising: a rear surface ( 118 ) spaced apart from the base surface ( 110 ) along the insert axis (A) and a cylindrical coupling peripheral surface ( 120 ) extending therebetween, the coupling peripheral surface ( 120 ) intersecting with the base surface ( 110 ) at a transition area ( 122 ); and a resilience slit ( 124 ) extending from the rear surface ( 118 ) in the forward direction (D F ) and opening out to the coupling peripheral surface ( 120 ), the resilience slit ( 124 ) having two opposite inner walls ( 131 ) converging in the forward direction (D F ) towards a slit inner end ( 126 ) which terminates at a slit inner end plane (P 2 ) perpendicular to the insert axis (A), wherein: the slit inner end plane (P 2 ) is spaced apart from the base plane (P 1 ) by a longitudinal distance (D); and the inner walls ( 131 ) of the resilience slit ( 124 ) form a first acute slit angle (α 1 ) therebetween.