Tungaloy TNMG160408-SM AH725 Turning Insert
Professional PVD Coated Grade | SM Precision Geometry | Optimized for Stainless Steel
What is the best carbide insert for machining 304 and 316 stainless steel?
The Tungaloy TNMG160408-SM AH725 is a high-performance, double-sided triangular carbide insert specifically engineered for the challenges of machining stainless steel (M-group) and heat-resistant alloys. Featuring the world-class AH725 PVD coating, this insert provides an extremely sharp cutting edge that prevents work hardening and built-up edge (BUE). The -SM chipbreaker is designed for light-to-medium duty cutting, ensuring excellent chip evacuation and superior surface finishes. 100% Made in Japan, it is the industrial choice for high-precision CNC turning where reliability is paramount.
AH725 PVD Technology
Combines a tough, fine-grained carbide substrate with a specialized PVD coating. This provides the edge sharpness needed to "shear" sticky stainless steel materials effectively.
SM Finishing Geometry
The "Stainless Medium" chipbreaker features a positive rake and sharp edge. It significantly reduces cutting forces and heat generation during long production runs.
0.8mm Radius Balance
The 0.8mm corner radius offers the perfect equilibrium between edge strength for medium roughing and the precision required for high-quality finishing.
Decoding TNMG 160408-SM Nomenclature
Tri
0°
Tol.
Hole
Size
Thk
0.8 Rad
Chip
3. Technical Data: Metric (ISO) vs. Imperial (ANSI)
| Technical Feature | Metric (ISO) | Imperial (ANSI) |
|---|---|---|
| Standard Model | TNMG160408-SM | TNMG 332-SM |
| 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 (Stainless)
- Cutting Speed (Vc): 80 - 180 m/min (Highly dependent on material hardness)
- Feed Rate (f): 0.12 - 0.35 mm/rev
- Depth of Cut (ap): 0.5 - 3.5 mm
*Optimization Note: When machining Duplex or sticky Austenitic alloys, prioritize high-pressure coolant to the cutting edge to enhance AH725 tool life.*
4. Primary Applications
- Austenitic Stainless Steels (SUS304, SUS316, SUS303).
- Precipitation Hardening Stainless (17-4PH).
- High-Temperature Alloys and Super Alloys.
- Medium-duty turning for aerospace and medical components.
5. Tool Compatibility
Compatible with all standard ISO TNMG 1604 pockets. Pairs perfectly with MTJNR/L, WTJNR/L, or DTGNR/L tool holder series. Fits Mazak, Haas, Okuma, and DMG Mori lathes.
7. Why Source from CNCHome-Beyond?
Tungaloy Japan Stock
Technical Expertise
Global Air Shipping
Factory Guaranteed
Global Shop Feedback
⭐⭐⭐⭐⭐ "Stainless Steel Solution" - Robert H., USA
"We were burning through inserts on 316L until we switched to AH725. The tool life doubled and the finish is amazing."
⭐⭐⭐⭐⭐ "Fast Shipping to EU" - Hans W., Germany
"Genuine Tungaloy product. Beyond provided fast shipping. The SM chipbreaker handles the long chips perfectly."
⭐⭐⭐⭐ "Very Stable" - Kenji T., Japan
"Consistent performance across different batches of stainless. Reliable choice for lights-out manufacturing."
⭐⭐⭐⭐⭐ "Top Grade" - Luca R., Italy
"The PVD coating on these is noticeably better than generic versions. Great edge toughness on interrupted cuts."
⭐⭐⭐⭐⭐ "Excellent ROI" - Sarah L., UK
"With 6 edges per insert and the longevity of the AH725 grade, our cost per part has dropped significantly."
8. FAQ - Professional Machining Support
Q: Can AH725 be used for Titanium?
A: Yes, AH725 is a multi-purpose PVD grade. While optimized for stainless steel, its sharp edge and high heat resistance make it an excellent choice for Titanium alloys.
Q: Why choose the 0.8mm radius over 0.4mm?
A: The 0.8mm radius is stronger and allows for higher feed rates. Choose 0.4mm only if you have strict corner radius requirements or thin-walled parts prone to vibration.
Q: Does this insert fit my standard tool holder?
A: It fits any standard ISO/ANSI 1604 (332) holder. Ensure your holder pocket is clean and the shim is not worn for best performance.
Tech Tip: PVD Edge Sharpness
The **AH725 PVD grade** is engineered to remain sharp. Unlike CVD coatings that can be slightly rounded, PVD maintains the "shearing" action necessary for stainless steel. This prevents work-hardening, ensuring your part stays within tolerance. **Tungaloy Japan** - Precision Redefined.
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