Sumitomo TCMT16T304N-SK AC8035P Carbide Turning Insert (10pc)

This is a new factory box of 10 Sumitomo Electric TCMT16T304N-SK carbide turning inserts in grade AC8035P, made in Japan. Decoding the ISO designation: T = triangular (60° included angle), C = 7° clearance angle, M = medium tolerance (±0.05–0.15 mm on inscribed circle), T = with hole and single-sided chipbreaker, 16T3 = 9.525 mm (3/8 in) inscribed circle / 16 mm side length / 3.97 mm thickness, 04 = 0.4 mm nose radius, N-SK = N-type neutral geometry with the SK (Semi-finishing, K-material) chipbreaker geometry optimized for light-to-medium cutting. Grade AC8035P is Sumitomo's PVD-coated cermet-based carbide targeting P-class steels and M-class stainless; the multilayer PVD coating provides high surface integrity and low cutting forces suited for finishing and semi-finishing of carbon steels, alloy steels, and stainless steels at moderate-to-high cutting speeds. Compatible toolholders use TCMT 16T3 pocket geometry (e.g., STFCR/L, MTJNR/L, PTGNR/L series boring bars and external holders). The box label confirms ISO dual designation TCMT32.51ENK / TCMT16T304N-SK and Sumitomo internal code TEM 73642 / H4037.

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