Tungaloy TNMG160408-TM AH725 Turning Insert
Tough PVD Grade | TM Medium-Cutting Geometry | 0.8mm Radius for Stability
What is the most versatile carbide insert for stainless and alloy steel?
The Tungaloy TNMG160408-TM AH725 is a high-performance, double-sided triangular insert engineered for multi-material excellence. Utilizing Tungaloy’s proprietary AH725 PVD coating, this insert is specifically designed to resist chipping and thermal shock, making it ideal for both continuous and light interrupted cuts. The -TM chipbreaker serves as the "all-rounder" for medium-range cutting depths, ensuring excellent chip control and lowering cutting resistance. With a robust 0.8mm corner radius, it provides superior edge strength for medium turning operations in Steel (P), Stainless Steel (M), and Heat-Resistant Alloys (S). 100% Made in Japan quality.
AH725 PVD Grade
A balance of high hardness and extreme toughness. The PVD coating maintains a sharp cutting edge, preventing Built-Up Edge (BUE) on gummy stainless steels.
TM Medium Chipbreaker
Designed with a balanced land and rake angle to cover a wide range of feed rates. It breaks chips efficiently, preventing long nests that can damage the workpiece.
6-Edge Triangular Design
Maximize your tooling budget. The double-sided TNMG design offers 6 cutting edges per insert, reducing the cost-per-part in high-volume CNC production.
Decoding TNMG 160408-TM Nomenclature
T
Tri
N
0°
M
Tol.
G
Clamp
16
Size
04
Thk
08
0.8 Rad
-TM
Chip
3. Technical Data: Metric (ISO) vs. Imperial (ANSI)
| Technical Feature |
Metric (ISO) |
Imperial (ANSI) |
| Standard Model |
TNMG160408-TM |
TNMG 332-TM |
| Inscribed Circle (IC) |
9.525 mm |
3/8" |
| Thickness (S) |
4.76 mm |
3/16" |
| Corner Radius (RE) |
0.8 mm |
1/32" |
Recommended Cutting Parameters
-
Steel (P): Vc: 120 - 280 m/min | f: 0.15 - 0.45 mm/rev
-
Stainless (M): Vc: 80 - 190 m/min | f: 0.12 - 0.35 mm/rev
-
Depth of Cut (ap): 0.8 mm - 4.5 mm
*Pro-Tip: Use high-pressure coolant when machining stainless steel to maximize the life of the AH725 PVD coating.*
4. Primary Applications
- General turning of carbon steel, alloy steel, and pre-hardened steel.
- Excellent performance on 304, 316, and duplex stainless.
- Boring and external turning requiring 0.8mm radius stability.
- Versatile for both continuous and light interrupted cuts.
5. Tool Compatibility
Standard ISO TNMG 1604 fit. Pairs with MTJNR/L, WTJNR/L, or DTGNR/L tool holders. Compatible with Haas, Mazak, Doosan, and Okuma CNC systems.
7. Why Source from CNCHome-Beyond?
100% Original
Tungaloy Japan Stock
Technical B2B Support
Machining Expertise
Fast Global Shipping
Air Express Available
Quality Verified
Sealed Original Boxes
What Global Machinists Say
⭐⭐⭐⭐⭐ "Reliable All-Rounder" - James K., USA
"The AH725 grade is our go-to for job shop work. Whether it's 1018 or 316, the TM chipbreaker just works. Great value for 6 edges."
⭐⭐⭐⭐⭐ "Authentic Tungaloy" - Markus D., Germany
"Received original sealed packaging. The tool life is superior to generic brands. The 0.8mm radius is very stable for medium cuts."
⭐⭐⭐⭐ "Great Chip Management" - Hiroshi S., Japan
"Using these for stainless steel valves. The chip control is predictable, which is vital for our automated cell."
⭐⭐⭐⭐⭐ "Fast Shipping" - Carlos M., Mexico
"Beyond always provides genuine stock. The technical advice helped us optimize our feed rates for better finish."
⭐⭐⭐⭐⭐ "Solid Performance" - Rajesh V., India
"Best price for genuine Japan-made inserts. The toughness of AH725 is unmatched for light interrupted cuts."
8. FAQ - Professional Support
Q: Is AH725 better than CVD grades for stainless steel?
A: For light to medium cuts and finishing, AH725 (PVD) is often superior because it has a sharper edge and higher toughness, which prevents chipping on gummy materials like stainless.
Q: Can I use this for heavy roughing steel?
A: The -TM geometry is designed for medium cutting. For very heavy roughing, we recommend the -TH or -TH chipbreakers with a larger corner radius for maximum edge strength.
Q: What tool holder do I need for this insert?
A: This is a standard 16-size (ISO) insert. Any TNMG 1604 or TNMG 33 series holder will fit, such as an MTJNR 2525 M16.
Tech Tip: PVD vs CVD Application
The **AH725 PVD grade** provides a sharper edge than CVD coatings, reducing cutting pressure and heat on the workpiece. This makes it the premier choice for stainless steel and high-temp alloys where surface finish is critical. **Tungaloy Japan** - Engineering excellence for global industry.
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