Sandvik N331.1A-08 45 08M-KM3040 CoroMill 331 Carbide Milling Insert (10pc)

This is a factory-new, sealed box of 10 Sandvik Coromant N331.1A-08 45 08M-KM3040 carbide milling inserts for the CoroMill 331 square shoulder milling system. The full ordering code breaks down as follows: N331.1A = insert geometry for CoroMill 331 (square insert, positive rake, double-sided); 08 = 8 mm inscribed circle; 45 = 45° approach/chamfer; 08 = 0.8 mm nose radius; M = medium chipbreaker geometry; KM3040 = Sandvik's CVD-coated cermet/carbide grade optimized for ISO K (cast iron) applications. Grade KM3040 features a TiCN+Al₂O₃ CVD multi-layer coating providing excellent wear resistance and is rated for cast iron machining at a cutting speed of 235 m/min (770 sfm) with a feed per tooth of 0.16 mm (0.006 in), as confirmed on the package label. The insert's concave bottom surface and center mounting hole are designed for positive screw clamping in CoroMill 331 milling cutters; the label specifies material group K2.2.C.UT at 245 HB, confirming suitability for gray/nodular cast iron. Made in USA per the package label.

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