CNMA inserts
80° rhombic turning insert. We make 6 CNMA sizes, from CNMA120404 to CNMA190612. Grade, coating and chipbreaker are matched to your material and operation.
What CNMA means
The first four letters of an ISO 1832 designation give the shape, the clearance angle, the tolerance class, and the hole and chipbreaker.
| Code | Feature | Meaning |
|---|---|---|
| C | Shape | 80° rhombic |
| N | Clearance angle | 0° (negative insert) |
| M | Tolerance class | Class M |
| A | Hole and chipbreaker | Cylindrical hole, no chipbreaker |
Where CNMA inserts are used
The 80° corner is strong and covers most turning and facing work, so C inserts are the usual first choice for general turning.
CNMA is a negative 80° rhombic turning insert. It has a cylindrical hole. It has no chipbreaker (a flat top). Flat-top inserts are common in cast iron, whose chips break on their own.
Choose the size for your depth of cut, the corner radius for the feed and finish, and a holder made for CNMA inserts of that size.
Questions
- What does CNMA mean?
- It is an ISO 1832 code. C = Shape: 80° rhombic; N = Clearance angle: 0° (negative insert); M = Tolerance class: Class M; A = Hole and chipbreaker: Cylindrical hole, no chipbreaker.
- Which CNMA sizes do you make?
- 6 sizes, from CNMA120404 to CNMA190612, with inscribed circles from 12.7 to 19.05 mm. Grade, coating and chipbreaker are confirmed with each quotation.
- How do I read CNMA120408?
- CNMA = format; 12 = Cutting edge length code (about 12 mm); 04 = Thickness (4.76 mm); 08 = Corner (0.8 mm nominal).
Related formats
Guides: CNMG vs WNMG vs DNMG vs TNMG · ISO material groups · Inserts for stainless steel
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