THREAD CUTTING THROW-AWAY TIP

摘要

A throw-away thread cutting insert (1) having a cutting tip (5) at a corner part thereof corresponding to a shape of a thread groove, a lead groove (8) formed in an upper surface of the insert and disposed adjacent to and inwardly of said cutting tip (5), and a curl recess (9) formed in an upper wall of the insert in continuous relation to one side wall of the insert and disposed inwardly of said lead groove (8).