CNMM inserts
80° rhombic turning insert. We make 7 CNMM sizes, from CNMM160612 to CNMM250924. Grade, coating and chipbreaker are matched to your material and operation.
What CNMM 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 |
| M | Hole and chipbreaker | Cylindrical hole, chipbreaker on one face |
Where CNMM 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.
CNMM is a negative 80° rhombic turning insert. It has a cylindrical hole. The chipbreaker is on one face only. It is used one side up. One-sided negative inserts are often used for heavy roughing.
Choose the size for your depth of cut, the corner radius for the feed and finish, and a holder made for CNMM inserts of that size.
Questions
- What does CNMM mean?
- It is an ISO 1832 code. C = Shape: 80° rhombic; N = Clearance angle: 0° (negative insert); M = Tolerance class: Class M; M = Hole and chipbreaker: Cylindrical hole, chipbreaker on one face.
- Which CNMM sizes do you make?
- 7 sizes, from CNMM160612 to CNMM250924, with inscribed circles from 15.875 to 25.4 mm. Grade, coating and chipbreaker are confirmed with each quotation.
- How do I read CNMM160612?
- CNMM = format; 16 = Cutting edge length code (about 16 mm); 06 = Thickness (6.35 mm); 12 = Corner (1.2 mm nominal).
Related formats
Guides: CNMG vs WNMG vs DNMG vs TNMG · ISO material groups · Inserts for stainless steel
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