Tungaloy TNMG220408L-S T9125 Turning Insert
Left-Hand High-Rigidity Machining | T9125 CVD Grade | RS Finishing Geometry
What is the best 22mm left-hand insert for precision steel finishing?
The Tungaloy TNMG220408L-S T9125 is an industrial-grade, left-hand (L) turning insert designed for the high-efficiency finishing of carbon and alloy steels. Utilizing the advanced T9125 CVD coated carbide grade, it offers an exceptional balance of wear resistance and fracture toughness, ensuring long tool life even under high-speed continuous cutting. The -S (RS) chipbreaker is specialized for light-duty finishing, providing superior chip control and preventing surface marring. With a 0.8mm corner radius and a robust 22mm size, it provides maximum rigidity for stable precision. 100% Made in Japan, it is the benchmark for B2B industrial CNC operations.
T9125 Grade Coating
Features a thick Al2O3 layer for superior heat resistance. This prevents plastic deformation and crater wear during high-speed finishing of steel alloys.
RS (-S) Chipbreaker
A sharp geometry designed for low cutting resistance. It ensures stable chip evacuation at small depths of cut, providing a high-quality surface finish.
22mm Heavy Stability
The larger 22 size provides a broader seating area, significantly reducing vibration and improving accuracy on large-diameter workpieces.
Decoding TNMG 220408L-S Nomenclature
T
Tri
N
0°
M
Tol.
G
D-Side
22
Size
04
Thk
08
0.8 Rad
L
LH
-S
Chip
3. Technical Data: Metric (ISO) vs. Imperial (ANSI)
| Technical Feature |
Metric (ISO) |
Imperial (ANSI) |
| Standard Model |
TNMG220408L-S |
TNMG 432L-S |
| Inscribed Circle (IC) |
12.7 mm |
1/2" |
| Thickness (S) |
4.76 mm |
3/16" |
| Corner Radius (RE) |
0.8 mm |
1/32" |
Recommended Finishing Parameters (Steel)
-
Cutting Speed (Vc): 150 - 320 m/min
-
Feed Rate (f): 0.10 - 0.35 mm/rev
-
Depth of Cut (ap): 0.2 - 1.5 mm
*Pro-Tip: Maintain a high cutting speed to activate the Al2O3 layer's thermal efficiency and prevent Built-Up Edge (BUE).*
4. Primary Applications
- Precision finishing of large shafts and gears.
- Boring operations requiring left-hand tool paths.
- Final dimensioning of carbon and alloy steel parts.
- Suitable for high-speed automated production.
5. Tool Compatibility
Compatible with all standard ISO/ANSI TNMG 2204 tool holders. Recommended for use with MTJNL or WTJNL series holders. Fits Haas, DMG Mori, and Mazak lathes.
7. Why Source from CNCHome-Beyond?
100% Original
Tungaloy Japan Stock
B2B Support
Technical Expertise
Global Logistics
Fast Delivery Options
Verified Stock
Factory Sealed Packaging
What Machinists are Saying
⭐⭐⭐⭐⭐ "Extreme Stability" - James K., USA
"The larger 22 size makes a huge difference in vibration control. This left-hand insert is perfect for our specialized tool paths. T9125 lasts through the whole batch."
⭐⭐⭐⭐⭐ "Original Quality stock" - Markus D., Germany
"Exactly as described. Authentic Tungaloy boxes. The 0.8mm radius is strong and provides a very predictable wear pattern."
⭐⭐⭐⭐ "Great Chip Control" - Hiroshi S., Japan
"Consistent results. The -S chipbreaker manages finishing chips perfectly. Very reliable B2B supplier."
⭐⭐⭐⭐⭐ "Top Surface Finish" - Alistair M., UK
"Used this for final dimensioning of large shafts. The surface luster is excellent. Fast shipping to our workshop."
⭐⭐⭐⭐⭐ "Best for High Speed" - Carlos M., Mexico
"T9125 is the benchmark for steel. Even at higher speeds, the edge remains sharp. Original packaging was well protected."
8. FAQ - Professional Support
Q: Why choose the TNMG 22 size over the standard 16?
A: The TNMG 22 size provides a larger seating area and higher mass, which translates to superior rigidity and heat dissipation when finishing larger or tougher workpieces.
Q: Is T9125 suitable for heavy interrupted cuts?
A: While T9125 has good toughness, it is optimized for high-speed continuous turning. For heavy interrupted cuts, Tungaloy's T9225 grade might be more suitable depending on the impact levels.
Q: What is the benefit of the -S chipbreaker?
A: The -S (RS) chipbreaker is designed with a sharper rake angle to reduce cutting resistance during light finishing, resulting in better surface finishes and lower vibration.
Tech Tip: Maximizing CVD Tool Life
To maximize tool life with **T9125**, avoid low cutting speeds that cause built-up edge (BUE). High-speed finishing allows the thermal barrier of the CVD coating to function at peak performance. **Tungaloy Japan** - Engineering excellence for global industry.
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