Sumitomo CNMG432EGUW AC405K Carbide Turning Insert (10pc)

This is a new, factory-sealed box of 10 Sumitomo Electric CNMG432EGUW inserts in grade AC405K, also designated CNMG120408N-GUW per the ISO metric system. Decoding the ANSI designation: C = 80° diamond shape, N = 0° clearance (negative rake), M = ±0.08mm / ±0.05mm tolerance class, G = single-sided with chipbreaker both faces and central mounting hole, 4 = 1/2 in (12.7 mm) inscribed circle, 3 = 3/16 in (4.76 mm) thickness, 2 = 1/32 in (0.794 mm) nose radius; the EGU chipbreaker geometry is Sumitomo's medium-duty universal negative chipbreaker designed for continuous to interrupted cutting, and the W suffix denotes a wiper edge. Grade AC405K is a CVD-coated (TiCN/Al₂O₃/TiN multilayer) cemented carbide optimized for steel (P) and stainless steel (M) turning across a broad range of cutting conditions, combining high wear resistance with thermal crack resistance. These inserts are compatible with CNMG-style negative toolholders in the PCLNR/L, MCLNR/L, and DCLNR/L families and are suited for medium-depth finishing to semi-roughing operations on carbon steel, alloy steel, and austenitic stainless steel. The box label confirms manufacture in Japan and Sumitomo's "Inspected" quality-control standard; the golden CVD coating and dark top surface (post-coat treatment) are clearly visible in the product photo.

Product Specifications