Patent ID: 8708613

Claim:
A cutting tool ( 20 ) comprising a cutting insert ( 22 ) with a single cutting portion ( 24 ), an insert holder ( 26 ) and a fastener ( 28 ), the cutting insert ( 22 ) having two opposing end surfaces ( 30 a , 30 b ) with an insert peripheral surface ( 32 ) and an insert central axis (A 1 ) extending therebetween, the insert peripheral surface ( 32 ) having three spaced apart abutment surfaces ( 34 , 36 , 38 ), and the insert holder ( 26 ) having a holding portion ( 46 ) extending along a longitudinal axis (A 2 ), the holding portion ( 46 ) having a holder peripheral surface ( 48 ) and an adjacent seating surface ( 50 ), with at least two protuberances ( 54 a , 54 b ) protruding from the seating surface ( 50 ), the at least two protuberances ( 54 a , 54 b ) defining four spaced apart reaction surfaces ( 56 a , 56 b , 56 c , 56 d ) transverse to the seating surface ( 50 ), the cutting insert ( 22 ) being securable to the holding portion ( 46 ) in left-hand and right-hand assembly positions by means of the fastener ( 28 ), with the three abutment surfaces ( 34 , 36 , 38 ) in clamping contact with three of the four reaction surfaces ( 56 a , 56 b , 56 c , 56 d ), wherein: in the left-hand assembly position, the first end surface ( 30 a ) is in clamping contact with the seating surface ( 50 ); and in the right-hand assembly position, the second end surface ( 30 b ) is in clamping contact with the seating surface ( 50 ).