Tungaloy SNMG120412 T9125 Turning Insert
High-Efficiency Steel Machining | Heavy-Duty 1.2mm Radius | Premium T9125 CVD Grade
What is the most stable insert for high-feed steel turning?
The Tungaloy SNMG120412 T9125 is a robust, double-sided square turning insert specifically engineered for high-productivity machining of ISO P (Steel) materials. Featuring a reinforced 1.2mm corner radius, this insert is built to handle higher feed rates and larger depths of cut compared to standard 0.4 or 0.8mm options. Powered by Tungaloy’s legendary T9125 CVD coating, it provides exceptional heat and wear resistance for both continuous and slightly interrupted cuts. Made in Japan, this insert is the industrial choice for automotive and heavy machinery shops requiring maximum metal removal rates (MRR) without sacrificing tool life.
T9125 CVD Durability
Multi-layered CVD coating technology optimized for steel. It offers a thick alumina (Al2O3) layer that protects the substrate from extreme heat during heavy-duty turning.
Reinforced 1.2mm Edge
The large 1.2mm (0.047") radius significantly increases the cutting edge strength, making it perfect for roughing or machining workpieces with uneven surfaces.
PremiumTec Finish
Tungaloy’s post-coating surface treatment smooths the insert face, reducing chip friction and preventing built-up edge even in high-torque scenarios.
Decoding SNMG120412 Technical Nomenclature
S
Square
N
0° Relief
M
Tolerance
G
Hole/Fix
12
12.7mm Size
04
4.76mm Thick
12
1.2mm Rad.
3. Technical Specifications: Metric vs. Imperial
| Parameter |
Metric (ISO) |
Imperial Equivalent |
| Inscribed Circle (IC) |
12.7 mm |
1/2" (SNMG 433) |
| Thickness (S) |
4.76 mm |
3/16" |
| Corner Radius (RE) |
1.2 mm |
3/64" |
| CVD Grade |
T9125 |
Steel Turning Specialist |
Recommended Cutting Parameters (T9125 Grade)
-
Cutting Speed (Vc): 120 - 280 m/min (Highly reliable for Carbon/Alloy Steel)
-
Feed Rate (f): 0.20 - 0.60 mm/rev (Excellent for high feeds)
-
Depth of Cut (ap): 1.5 - 5.0 mm (Heavy turning capability)
*Pro Tip: The 1.2mm radius allows for much higher feeds while still maintaining decent surface quality. Ideal for roughing components before final finishing passes.*
4. Product Applications
- Heavy-duty turning of large steel shafts and flanges.
- Roughing cycles in forged or cast steel workpieces.
- Automotive component production (driveshafts, gear blanks).
- High-metal-removal rate (MRR) industrial machining.
5. Holder Compatibility
Universal fit for standard ISO Turning Holders (External: DSBNR/L, PSSNR/L; Internal: S...-PSSNR/L). Fits all SNMG 1204 pockets on CNC lathes. Highly recommended for rigid, high-torque setups.
7. Why Choose CNCHome-Beyond?
Genuine Tungaloy
100% Original Japanese Stock
Expert Knowledge
B2B Technical Support
Global Logistics
Express Shipping Worldwide
Industrial Supply
Wholesale Factory Pricing
Machinist Feedback from Around the Globe
⭐⭐⭐⭐⭐ "Roughing Beast" - Mark S., UK
"The 1.2mm radius is a lifesaver for our roughing passes. T9125 handles the heat much better than other brands we've tried. Very stable tool."
⭐⭐⭐⭐⭐ "Original Quality" - G. Meyer, Germany
"Exactly as advertised. Authentic Tungaloy Japan. We use these for large engine shaft production. Reliable and consistent."
⭐⭐⭐⭐ "Great Life" - T. Yamamoto, Japan
"Consistently high tool life even when we push the depth of cut. Tungaloy CVD technology is excellent for carbon steel."
⭐⭐⭐⭐⭐ "B2B Supplier" - F. Rossi, Italy
"Fast shipping and original packaging. CNCHome-Beyond is now our preferred supplier for original Japanese carbide."
⭐⭐⭐⭐⭐ "Strong Edge" - Lee W., Singapore
"Excellent resistance to chipping on the radius. The 1.2mm RE is very strong for heavy-duty CNC lathes."
8. FAQ - Turning Support
Q: Is T9125 a universal grade for all materials?
A: T9125 is a specialist for ISO P (Steel). For cast iron or stainless steel, other grades like T5115 or AH630 are recommended.
Q: Why use a 1.2mm radius instead of 0.8mm?
A: The larger radius provides a stronger cutting edge and allows for higher feed rates, which reduces total cycle time during roughing passes.
Q: Does this fit SNMG 433 holders?
A: Yes, SNMG 120412 is the metric equivalent to the Imperial SNMG 433 size.
Expert Insight: CVD vs. PVD for Heavy Roughing
For large depths of cut and sustained high-heat turning, CVD grades like T9125 are superior to PVD coatings. The thick alumina layer acts as a thermal shield, protecting the carbide core from cratering. Paired with a 1.2mm radius, this insert becomes a productivity powerhouse for your CNC lathe. Trust Tungaloy Japan for your most demanding steel jobs. Experience industrial-grade reliability today.
© Technical Data by cnchome-beyond.com - CNC Industrial Authority
