Kennametal Carbide Inserts QTY5 CNMG643 / CNMG190612 KC990 (LOC3696)

Kennametal Carbide Insert cnmg643 / cnmg190612 KC990. A multilayered alumina coated grade with a high-strength substrate. Coated with TiCN and then alternating layers of Al2O3 and TiN. Engineered for finishing of carbon and alloy steels, and ductile, nodular, or malleable irons. The thin alumina coating layers are very hard. Best speed range is above 650 sfm in smooth cuts. In most applications, grade KC990 may be replaced by grade KC9010, with better machining results.