TNMA inserts
60° triangular turning insert. We make 3 TNMA sizes, from TNMA160404 to TNMA160412. Grade, coating and chipbreaker are matched to your material and operation.
What TNMA 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 |
|---|---|---|
| T | Shape | 60° triangular |
| N | Clearance angle | 0° (negative insert) |
| M | Tolerance class | Class M |
| A | Hole and chipbreaker | Cylindrical hole, no chipbreaker |
Where TNMA inserts are used
The 60° triangle has three corners per face and a long cutting edge for its size: a compromise between corner strength and access.
TNMA is a negative 60° triangular 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 TNMA inserts of that size.
Questions
- What does TNMA mean?
- It is an ISO 1832 code. T = Shape: 60° triangular; N = Clearance angle: 0° (negative insert); M = Tolerance class: Class M; A = Hole and chipbreaker: Cylindrical hole, no chipbreaker.
- Which TNMA sizes do you make?
- 3 sizes, from TNMA160404 to TNMA160412, all with a 9.525 mm inscribed circle. Grade, coating and chipbreaker are confirmed with each quotation.
- How do I read TNMA160408?
- TNMA = format; 16 = Cutting edge length code (about 16 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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