12.7 × 4.76 × 0.4 mm inserts
Indexable turning inserts whose three key dimensions coincide: inscribed circle d1 = 12.7 mm (0.5 in), thickness s = 4.76 mm (0.187 in), nose radius rε = 0.4 mm (0.016 in). This is the dimension set behind an “equivalent insert” search — read the interchange note before substituting.
6 designations across 4 insert shapes (C, D, T, W) share these dimensions.
Equal d1, s and rε alone do not make inserts interchangeable: shape and clearance must match too — a 60° triangular insert and a 55° rhombic insert at the same dimensions cut completely different profiles and seat in different holders. Rows below are grouped by shape; true geometric interchange applies within the same ISO core code across brands, as shown on each model page.
Models at this dimension set
| Model | Shape | Clearance | Tolerance / fixing | Brand offers | |
|---|---|---|---|---|---|
| CCMT120404 | C 80° rhombic | C · 7° | MT | 6 | Specs → |
| CNMG120404 | C 80° rhombic | N · 0° | MG | 6 | Specs → |
| DCMT150404 | D 55° rhombic | C · 7° | MT | pending | Specs → |
| DNMG150404 | D 55° rhombic | N · 0° | MG | pending | Specs → |
| TNMG220404 | T 60° triangle | N · 0° | MG | pending | Specs → |
| WNMG080404 | W 80° trigon | N · 0° | MG | 6 | Specs → |
Every value on this page is derived deterministically from the ISO 1832 designation (positions 1–7). Brand ordering codes, chipbreakers and grades with cited sources appear on each linked model page.