Tungaloy TNMG160404 / TNMG160408 T5115 Turning Inserts
High-Stability Cast Iron Machining | Premium T5115 CVD Grade | Japan Original
What is the best carbide grade for machining gray and ductile cast iron?
The Tungaloy TNMG160404/08 T5115 series represents the pinnacle of cast iron turning technology. Engineered with the T5115 CVD coated carbide grade, these inserts are specifically designed to withstand the abrasive nature of gray (FC) and ductile (FCD) cast iron. By combining a thick, wear-resistant coating with a toughened substrate, the T5115 grade offers unparalleled tool life and edge reliability even during high-speed continuous or light interrupted cuts. Whether you need the precision of a 0.4mm radius (04) or the strength of a 0.8mm radius (08), these inserts deliver consistent performance in professional CNC environments.
T5115 CVD Coating
Features a thick Al2O3 layer that provides exceptional heat resistance and wear protection against the abrasive graphite flakes in cast iron materials.
Premium Substrate
The high-toughness carbide substrate prevents sudden edge breakage, making it ideal for the varying densities found in large cast iron workpieces.
Consistent Surface Finish
Tungaloy's specialized post-coating surface treatment reduces friction, leading to improved chip evacuation and a more predictable surface Ra value.
Decoding TNMG 160404/08 Nomenclature
T
Triangular
N
0° Relief
M
Tolerance
G
Double Sided
16
16mm Length
04
4.76mm Thk
04/08
0.4/0.8 Rad
3. Technical Specifications: Metric (ISO) vs. Imperial (ANSI)
| Feature |
Metric (ISO) |
Imperial (ANSI) |
| Standard Models |
TNMG160404 / 08 |
TNMG 331 / 332 |
| Inscribed Circle (IC) |
9.525 mm |
3/8" |
| Thickness (S) |
4.76 mm |
3/16" |
| Corner Radius (RE) |
0.4 mm / 0.8 mm |
1/64" / 1/32" |
Recommended Cutting Parameters (Cast Iron)
-
Cutting Speed (Vc): 120 - 450 m/min
-
Feed Rate (f): 0.15 - 0.50 mm/rev
-
Depth of Cut (ap): 1.0 - 4.5 mm
*Note: T5115 is optimized for high-speed machining. Increase cutting speed for better chip control in gray iron.*
4. Primary Applications
- Turning gray iron casting (FC series).
- Boring ductile/nodular iron (FCD series).
- Automotive brake rotors and engine block finishing.
- High-volume industrial pump and valve housings.
5. Tool Compatibility
Fits all standard ISO/ANSI triangular tool holders. Works perfectly with MTJNR/L, WTJNR/L, and DTGNR/L series tool holders and boring bars.
7. Why Choose CNCHome-Beyond?
100% Genuine
Original Tungaloy Japan
Technical Experts
Technical Director Support
B2B Direct Supply
Professional Sourcing
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Machinist Feedback from the Field
⭐⭐⭐⭐⭐ "Best for Ductile Iron" - Robert T., USA
"T5115 is my go-to for nodular iron pumps. The tool life is double compared to standard PVD grades. Consistent and reliable."
⭐⭐⭐⭐⭐ "Original Quality" - Dieter S., Germany
"Exactly as advertised. Factory sealed boxes. Tungaloy's Japan factory products always deliver the best surface finish."
⭐⭐⭐⭐ "Great Performance" - Chen L., Singapore
"Used the TNMG160408 on brake rotor machining. The 0.8mm radius is very robust. Good chip control at 300 m/min."
⭐⭐⭐⭐⭐ "Reliable B2B Partner" - Kenji O., Japan
"Fast delivery. These are original Japan parts. Highly recommended for any serious CNC workshop."
⭐⭐⭐⭐⭐ "Excellent Price/Quality" - Alistair M., UK
"Sourced these for a long batch run on grey iron casting. The T5115 grade didn't crack once. Great edge strength."
8. FAQ - Cast Iron Machining Support
Q: Why should I use T5115 for cast iron instead of steel grades?
A: Cast iron is highly abrasive. T5115 has a specialized thick Al2O3 CVD coating specifically designed to resist the abrasive wear and heat generated by graphite flakes.
Q: Should I use coolant when turning cast iron?
A: For gray iron, dry machining is often preferred to prevent thermal cracking. However, for ductile iron or heavy roughing, a consistent flow of coolant is recommended.
Q: What is the difference between 160404 and 160408?
A: 160404 (0.4mm radius) is better for finishing and thin-walled parts. 160408 (0.8mm radius) is much stronger for roughing and larger depths of cut.
Tech Tip: T5115 vs. T515 Grade
While **T5115** is optimized for high-speed continuous cutting of gray and ductile iron, choose **T515** if your operation involves heavy interruptions or unstable setups. **Tungaloy Japan** - Engineering excellence for cast iron technology.
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