Sumitomo Electric Industries, Ltd. 6NC-TNGA331 Hard Turning Insert

Sumitomo Electric Industries, Ltd.'s 6NC-TNGA331 hard turning insert is a 60-degree TNGA geometry triangle PCBN (CBN) cutting insert designed for hard turning of hardened steels. It comes in a 3/8 inch inscribed-circle size and features a 0.0156 inch corner radius, with the 6NC designation indicating its clamp style for compatible small-lathe holders. Catalog entries for the 6NC-TNGA331 family identify a PCBN (CBN) substrate grade to deliver high wear resistance and edge stability during turning. This TNGA331 geometry provides a rigid edge profile and reliable radius control in tight tool pockets, enabling accurate finishing and controlled roughing of hardened workpieces while maintaining dimensional integrity.