WNMA inserts
80° trigon turning insert. We make 4 WNMA sizes, from WNMA060408 to WNMA080412. Grade, coating and chipbreaker are matched to your material and operation.
What WNMA 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 |
|---|---|---|
| W | Shape | 80° trigon |
| N | Clearance angle | 0° (negative insert) |
| M | Tolerance class | Class M |
| A | Hole and chipbreaker | Cylindrical hole, no chipbreaker |
Where WNMA inserts are used
The trigon has three 80° corners per face: a corner as strong as a C insert's, more corners per insert, but a shorter cutting edge for the same inscribed circle.
WNMA is a negative 80° trigon 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 WNMA inserts of that size.
Questions
- What does WNMA mean?
- It is an ISO 1832 code. W = Shape: 80° trigon; N = Clearance angle: 0° (negative insert); M = Tolerance class: Class M; A = Hole and chipbreaker: Cylindrical hole, no chipbreaker.
- Which WNMA sizes do you make?
- 4 sizes, from WNMA060408 to WNMA080412, with inscribed circles from 9.525 to 12.7 mm. Grade, coating and chipbreaker are confirmed with each quotation.
- How do I read WNMA080408?
- WNMA = format; 08 = Cutting edge length code (about 8 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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