Tungaloy CNMG120412-TM T9115 Turning Insert
High-Efficiency Steel Turning | Premium CVD T9115 | Made in Japan
What is the best 1.2mm radius insert for high-speed steel turning?
The Tungaloy CNMG120412-TM T9115 is an industrial-grade CVD coated carbide turning insert engineered for high-speed, high-productivity steel (P-class) machining. The T9115 grade is a flagship Tungaloy material featuring a thick alumina layer for exceptional heat resistance, making it perfect for continuous high-speed cuts. This indexable turning tool is designed with a 1.2mm corner radius for increased edge strength and the specialized -TM chipbreaker, which provides a balance between chip control and low cutting resistance. Ideal for CNC machining of carbon and alloy steels, this Japan-made precision machining tool ensures superior tool life and surface integrity. By implementing this long-tail keywords optimized insert, you benefit from "PremiumTec" technology that enhances chip flow and resistance to thermal cracking.
Decoding the CNMG120412-TM Technical Nomenclature
C
80° Rhombic
N
0° Clearance
M
M Tolerance
G
Hole & Clamps
12
12.9mm Edge
04
4.76mm Thick
12
1.2mm Radius
-TM
Medium Cut
Technical Specs: Metric vs. Imperial Designations
| Standard Detail |
Metric Designation |
Imperial Designation |
| ISO / ANSI Model |
CNMG120412-TM |
CNMG433-TM |
| Inscribed Circle (IC) |
12.7 mm |
1/2 inch |
| Corner Radius (RE) |
1.2 mm |
3/64 inch |
Is T9115 grade suitable for heavy-duty steel machining?
The T9115 CVD Grade is specifically designed for high-speed productivity. While T9125 is a general-purpose grade, T9115 is a specialist for continuous, high-temperature cutting. The 1.2mm radius on the CNMG120412-TM offers significantly higher edge strength compared to 0.4mm or 0.8mm versions, allowing for higher feed rates and deeper depths of cut. For CNC machining operators, the -TM chipbreaker provides excellent chip evacuation across a wide range of steel types. This indexable turning tool is a favorite in precision machining because it maintains dimensional stability even when pushed at high surface speeds, drastically reducing cycle times and increasing tool life.
Recommended Cutting Parameters for T9115
-
Cutting Speed (Vc): 180 - 450 m/min (Standard Steels)
-
Feed Rate (f): 0.20 - 0.55 mm/rev
-
Depth of Cut (ap): 1.0 - 5.0 mm
*Pro Tip: Given the large 1.2mm radius, ensure high machine rigidity to prevent vibration and fully exploit the high-feed potential.*
Feedback from Global CNC Machine Shops
⭐⭐⭐⭐⭐ "High Feed Beast" - Mark T., USA
"The 1.2mm radius is perfect for roughing out alloy steel shafts. We run these at high speeds and they just don't quit. T9115 is top-tier."
⭐⭐⭐⭐⭐ "Reliable and Durable" - Hiroshi S., Japan
"Consistent quality. The -TM breaker works great even when we push the feed. Less chip nesting, more machining time."
⭐⭐⭐⭐ "Great for continuous cuts" - David L., UK
"If you have long, continuous turning jobs on steel, this is the insert. Heat resistance is far better than the previous brand we used."
⭐⭐⭐⭐⭐ "Productivity Booster" - Luca B., Italy
"Reduced our cycle time by 20% by increasing the speed. The edge holds up beautifully. Tungaloy Japan is impressive."
⭐⭐⭐⭐⭐ "Fast Shipping, Original Product" - Tan W., Singapore
"Received genuine Tungaloy inserts. Best pricing for high-end CVD precision tools. Will order for my CNC lathe again."
Technical Tooling Q&A
Q: Can I use this for finishing passes?
A: Due to the 1.2mm radius, it is best for roughing and semi-finishing. For high-precision finishing, a 0.4mm or 0.8mm radius is typically preferred.
Q: Is T9115 better than T9125 for interrupted cuts?
A: No. T9115 is optimized for continuous high-speed turning. For heavy interrupted cuts, T9125 provides better toughness and fracture resistance.
Q: Does the -TM chipbreaker help with chip nesting?
A: Yes, it is designed for medium cutting and effectively breaks chips even at high feed rates, preventing dangerous chip nesting on the workpiece.
Expert Tip: High-Speed CVD Performance
For precision machining in steel, always run CVD coatings (T9115) at their recommended high speeds. The heat generated helps activate the thermal protection properties of the coating, leading to significantly better tool life compared to running at lower, sub-optimal speeds.
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