Patent ID: 8465233

Claim:
A double-sided slot-milling insert to be on-edge mounted to a toolholder of a slot-milling tool in a staggered manner, comprising: a first side surface; a second side surface; and a plurality of edge surfaces between the first and second side surfaces, each edge surface intersecting with another edge surface at a corner and forming a cutting edge, wherein the first and second side surfaces each have a side insert supporting surface for abutting against an abutment surface in a toolholder, and the insert has reflective symmetry about a central plane extending through the edge surfaces midway between the first and second side surfaces, wherein a chipbreaker is provided on each edge surface and corresponds to each cutting edge, and that each chipbreaker includes a recess beneath the cutting edge and a portion projecting toward the cutting edge, the projecting portion defining first and second chip deflecting recesses between the projecting portion and the first and second side surfaces, respectively.