Sumitomo CNMG120408N-SEW AC810P Carbide Turning Insert (10pc)
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The Sumitomo CNMG120408N-SEW (ANSI: CNMG432ESEW) is a new, factory-inspected 80° diamond-shaped (C) negative rake carbide turning insert in grade AC810P, featuring Sumitomo's multi-layer CVD TiCN/Al2O3/TiN coating optimized for continuous and light interrupted turning of steels (ISO P application class). The SEW chipbreaker geometry is a finish-cut (F) design rated for feed rates of 0.004–0.028 IPR (0.1–0.7 mm/rev) and cutting speeds of 886–1411 SFM (270–430 m/min), making it well-suited for smooth, close-tolerance finishing passes on carbon and alloy steels. Insert dimensions per ISO CNMG120408: 12.7 mm (½ in) inscribed circle, 4.76 mm thickness, 0.8 mm nose radius, 7° clearance angle, M-tolerance class, with a central 40° countersunk hole for screw clamping in standard CNMG-style toolholders. Each box contains 10 inserts, made in Japan and individually inspected by Sumitomo Electric Hardmetal.
Product Specifications
| Brand | Sumitomo Electric Hardmetal |
| ISO Part Number | CNMG120408N-SEW |
| ANSI Part Number | CNMG432ESEW |
| Grade | AC810P |
| Insert Shape | C — 80° Diamond |
| Relief Angle | N — 0° (Negative Rake) |
| Tolerance Class | M |
| Chipbreaker | SEW (Finish) |
| Inscribed Circle (IC) | 12.7 mm (1/2 in) |
| Insert Thickness | 4.76 mm (3/16 in) |
| Nose Radius | 0.8 mm (1/32 in) |
| Coating | CVD TiCN/Al2O3/TiN (multi-layer) |
| ISO Application | P (Steel) |
| Cut Type | Finish (F) |
| Cutting Speed (Vc) | 270–430 m/min (886–1411 SFM) |
| Feed Rate (f) | 0.1–0.7 mm/rev (0.004–0.028 IPR) |
| Quantity per Box | 10 inserts |
| Country of Origin | Japan |
| Condition | New |