TNMG 160408 CBN
TNMG160408 CBN is a high-performance CBN turning insert designed for machining hardened steels, cast iron, and high-hardness alloy materials. The negative triangular geometry provides 6 cutting edges, ensuring economical machining and long tool life during hard turning operations.
This insert is especially suitable for finish and semi-finish turning of materials above 45 HRC, where conventional carbide inserts wear rapidly. CBN cutting edges provide excellent wear resistance, thermal stability, and dimensional accuracy even at high cutting speeds.
The TNMG160408 CBN insert performs well in:
- hardened steel machining
- bearing steel turning
- cast iron machining
- interrupted and continuous cuts
- precision finishing operations
The 0.8 mm nose radius allows stable cutting and improved surface finish during medium and finish turning applications.
Recommended Cutting Data
Hardened Steel (50–62 HRC)
| Operation | Vc (m/min) | ap (mm) | f (mm/rev) |
|---|---|---|---|
| Finish Turning | 120–220 | 0.05–0.20 | 0.05–0.12 |
| Medium Turning | 100–180 | 0.20–0.50 | 0.08–0.18 |
| Interrupted Cut | 60–120 | 0.10–0.50 | 0.05–0.15 |
Cast Iron
| Operation | Vc (m/min) | ap (mm) | f (mm/rev) |
|---|---|---|---|
| Finish Turning | 180–350 | 0.05–0.30 | 0.05–0.15 |
| Rough Turning | 120–250 | 0.30–1.00 | 0.10–0.30 |
Recommended values are based on common CBN hard turning applications and manufacturer recommendations.
Compatible Tool Holders
Suitable for standard TNMG holders:
- MTJNR/L 2020K16
- MTJNR/L 2525M16
- MTUNR/L holders
- Internal boring bars for TNMG inserts
Examples of compatible holders are listed by TNMG insert manufacturers.
Key Features
- CBN cutting edge for hardened materials
- Excellent wear resistance
- High thermal stability
- Suitable for hard turning above 45 HRC
- 6 effective cutting edges
- Stable cutting in continuous and interrupted operations
- Excellent surface finish capability
Equivalent Grades
Comparable to:
