Tungaloy TNMG160404-SM AH725 Turning Insert
High-Performance PVD Coated Grade | SM Finishing Geometry | Precision Stainless Machining
What is the best carbide grade for machining stainless steel and sticky materials?
The Tungaloy TNMG160404-SM AH725 is a high-precision, double-sided triangular carbide insert designed specifically for the demanding requirements of stainless steel (M-group) and heat-resistant alloys (S-group). Featuring the advanced AH725 PVD (Physical Vapor Deposition) coating, this insert offers an exceptional balance of wear resistance and toughness. The -SM chipbreaker is specialized for light-to-medium cutting, providing sharp shearing action to prevent work hardening and built-up edge. 100% Made in Japan, it is the industrial standard for achieving superior surface finishes in difficult-to-cut materials.
AH725 PVD Coating
A sub-micron carbide substrate combined with a high-aluminum content PVD coating. This provides extreme edge sharpness and prevents oxidation during high-heat stainless machining.
SM Finishing Geometry
The -SM chipbreaker features a positive rake angle and sharp cutting edge. It minimizes cutting force and is perfect for finishing-to-medium applications where chip control is critical.
Double-Sided 6-Edge Design
The TNMG triangular shape provides 6 usable cutting corners (3 per side), offering maximum economic efficiency and reducing your cost-per-edge in high-volume production.
Decoding TNMG 160404-SM Nomenclature
T
Tri
N
0°
M
Tol.
G
Hole
16
Size
04
Thk
04
0.4 Rad
-SM
Chip
3. Technical Data: Metric (ISO) vs. Imperial (ANSI)
| Technical Feature |
Metric (ISO) |
Imperial (ANSI) |
| Standard Model |
TNMG160404-SM |
TNMG 331-SM |
| Inscribed Circle (IC) |
9.525 mm |
3/8" |
| Thickness (S) |
4.76 mm |
3/16" |
| Corner Radius (RE) |
0.4 mm |
1/64" |
Recommended Cutting Parameters (Stainless)
-
Cutting Speed (Vc): 70 - 180 m/min (Material dependent)
-
Feed Rate (f): 0.10 - 0.30 mm/rev
-
Depth of Cut (ap): 0.5 - 3.0 mm
*Pro-Tip: When machining 304/316 stainless, use the -SM chipbreaker to keep cutting forces low and prevent work hardening of the workpiece surface.*
4. Primary Applications
- Austenitic Stainless Steel (SUS304, SUS316).
- Duplex Stainless Steels.
- Heat Resistant Super Alloys (Inconel, Titanium).
- Finishing to semi-finishing of small-to-medium parts.
5. Tool Compatibility
Standard ISO TNMG 1604 pockets. Fits perfectly with MTJNR/L, WTJNR/L, or DTGNR/L tool holders. Compatible with all major CNC lathe brands including Haas, Mazak, and Citizen.
7. Why Choose CNCHome-Beyond?
100% Genuine
Tungaloy Japan Stock
Precision Grade
Original PVD Coating
Fast Global Delivery
Express Air Logistics
Sealed Packaging
Factory Guaranteed
Global B2B Feedback
⭐⭐⭐⭐⭐ "Best for 316 Stainless" - Robert H., USA
"We were struggling with built-up edge on 316 parts. The AH725 grade and SM chipbreaker solved it instantly. Surface finish is like a mirror."
⭐⭐⭐⭐⭐ "Reliable Tool Life" - Hans W., Germany
"Very predictable wear patterns. We use these for lights-out production in our shop. Fast shipping from Beyond as always."
⭐⭐⭐⭐ "Sharp Cutting" - Kenji T., Japan
"The SM geometry is very sharp. Great for thin-walled stainless parts where you need to keep the vibration down."
⭐⭐⭐⭐⭐ "Authentic Quality" - Luca R., Italy
"Received original Tungaloy boxes. You can tell the difference in the PVD coating compared to cheaper alternatives."
⭐⭐⭐⭐⭐ "Solid Performance" - Sarah L., UK
"Consistent results across different batches of stainless. Excellent value for money given the 6 edges."
8. FAQ - Professional Support
Q: Is AH725 better than CVD grades for stainless?
A: For light-to-medium cutting and finishing, PVD grades like AH725 are superior because they maintain a much sharper edge, which is vital to prevent work hardening in stainless steel.
Q: What does the -SM chipbreaker do?
A: It is designed specifically for stainless finishing. The geometry reduces cutting resistance and helps in breaking difficult chips common in austenitic alloys.
Q: Can I use this insert on alloy steel?
A: Yes, AH725 is a very versatile grade. While optimized for stainless, it performs excellently on carbon and alloy steels, especially in finishing applications.
Tech Tip: PVD vs. CVD in Stainless Machining
While CVD coatings offer high heat resistance, **PVD coatings (AH725)** provide the edge sharpness required to "shear" stainless steel. This prevents the material from sticking to the tool (built-up edge), ensuring high surface quality and dimensional accuracy. **Tungaloy Japan** - Excellence in Specialized Machining.
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