High-speed milling cutter and insert

A high-speed milling cutter, comprising:

• a shank having an insert pocket with a raised boss;
• and
• at least one cutting insert;
• said at least one cutting insert comprising:
• a top surface, a bottom surface and side surfaces;
• a radiused primary cutting edge defined at the intersection between the top surface and two side surfaces;
• a radiused secondary cutting edge defined at the intersection between the top surface and one of said two side surfaces, said radiused secondary cutting edge extending along a longitudinal axis of said cutting insert;
• a tertiary cutting edge defined at the intersection between the top surface and the other one of said two side surfaces;
• a transitional edge defined at the intersection between said tertiary cutting edge and said radiused secondary cutting edge;
• and
• a bore in said bottom surface capable of receiving said raised boss for mounting said at least one cutting insert in said insert pocket,
• wherein said tertiary cutting edge extends entirely between said radiused primary cutting edge and said transitional edge, and
• wherein said tertiary cutting edge has a length shorter than a length of said radiused secondary cutting edge.