A cutting tool (20) having a tool body (30) and a cutting insert (50) releasably retained in a pocket of the tool body. The cutting insert (50) having first (157) and second (158) rear insert abutment surfaces and a third forward insert abutment surface (160) and the pocket having first (137) and second (138) rear pocket abutment surfaces and a third forward pocket abutment surface (40). The first and second abutment surfaces (137, 138, 157, 158) being separated from the third abutment surface (160, 40) by a bore. The third forward pocket abutment surface (40) can be either a socket recessed in a pocket base surface or a protrusion protruding from the base surface and the third forward insert abutment surface can be correspondingly either a protrusion protruding from an inner surface of the insert or a socket recessed in the inner surf ace. The abument forces generate a torque that presses an abument surface of the insert against an abument surface of the tool body thereby substantially fixing the orientation of the insert relative to the tool body.