Interstate TNMG432 TCM55 Carbide Turning Insert (10pc)
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These are new Interstate Carbide TNMG432 indexable turning inserts in grade TCM55, sold as a factory pack of 10. The TNMG designation decodes as: T = triangular (60° included angle), N = 0° clearance (relieved on holder), M = M-tolerance class, G = with hole and chip groove (single-sided chipbreaker). The 432 suffix specifies a 1/2 in (12.7 mm) inscribed circle, 3/16 in (4.76 mm) thickness, and a 1/32 in (0.794 mm) nose radius. The gold-bronze PVD TiN-based coating visible on the inserts is consistent with Interstate's TCM55 grade, a coated carbide grade suited for general-purpose turning of steels and alloys at moderate cutting parameters. These inserts are compatible with standard TNMG-style toolholders using 0° seat angle, including common MTGNR/L and similar turning tool bodies.
Product Specifications
| Brand | Interstate Carbide |
| MPN | TNMG432 TCM55 |
| Insert Shape | Triangular (T) — 60° included angle |
| ISO Designation | TNMG432 |
| Clearance Angle | 0° (N) |
| Tolerance Class | M |
| Chipbreaker | Single-sided, with hole (G) |
| Inscribed Circle (IC) | 1/2 in (12.7 mm) |
| Thickness | 3/16 in (4.76 mm) |
| Nose Radius | 1/32 in (0.794 mm) |
| Grade | TCM55 |
| Coating | PVD TiN-based (gold color) |
| Cutting Edges per Insert | 3 (single-sided) |
| Quantity | 10 per pack |
| Condition | New |
| Compatible Holder Style | TNMG 0° seat turning toolholders |