INDEXABLE INSERTS
TNMM Turning Inserts
Compare TNMM parent models by material and application before choosing a brand.
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TNMM covers 5 insert sizes in a triangular 60° shape giving six cutting edges — the lowest cost per edge, at the price of a weaker tip. We stock 15 variants across the family from Achteck, published for Steel.
Sizes in this family
Every TNMM size we carry, with the measured geometry and how many variants are in stock. Open a size for the full cutting data and grade list.
| Size | IC (mm) | Thickness (mm) | Nose radius (mm) | Variants | Material groups |
|---|---|---|---|---|---|
| TNMM 160408 | 9.53 | 4.76 | 0.8 | 3 | P |
| TNMM 160412 | 9.53 | 4.76 | 1.2 | 3 | P |
| TNMM 220408 | 12.7 | 4.76 | 0.8 | 3 | P |
| TNMM 220412 | 12.7 | 4.76 | 2.2 | 3 | P |
| TNMM 220416 | 12.7 | 4.76 | 1.6 | 3 | P |
Grades stocked in this family
AC052P, AC152P, AC252P.
The family is published for Steel. Pick the grade from the group you are cutting — how to read grade names.
Chipbreaker geometries
PD8. The chipbreaker defines the feed window — chipbreaker selection guide.
Typical operations
- Roughing
Which size do you need?
- Inscribed circle sets the maximum depth of cut. As a rule keep ap under about two thirds of the IC.
- Nose radius trades finish against strength. A larger radius gives better surface finish at the same feed and a stronger edge, but raises cutting force and cannot produce tight internal corners.
- Check the holder. The holder designation must carry the same shape letter and the same size digit as the insert.
Related
Supplied by Beijing Henglang Precision Tools Co., Ltd.