Tungaloy SNMG120408R-S T9125 Turning Insert
High-Stability Right-Hand Steel Machining | T9125 CVD Grade | Specialized -S Chipbreaker
What is the best insert for stable right-hand steel finishing?
The Tungaloy SNMG120408R-S T9125 is a high-performance, double-sided square turning insert specifically engineered for ISO P (Steel) applications. This Right-Hand (R) specific geometry, combined with the -S chipbreaker, is designed to provide maximum stability during finishing and light-to-medium duty turning. Utilizing Tungaloy’s premium T9125 CVD coated grade, this insert offers an industry-leading balance of thermal stability and high-speed wear resistance. 100% Made in Japan, it is the professional choice for CNC workshops requiring consistent precision and long tool life in alloy and carbon steels.
T9125 Grade Technology
A specialized CVD grade featuring a thick Al2O3 layer that acts as a thermal barrier, protecting the carbide substrate from heat deformation during high-speed steel turning.
-S Chipbreaker Design
The -S geometry is optimized for chip control in finishing. It creates stable chip breaking even at lower depths of cut, ensuring the workpiece surface remains scratch-free.
PremiumTec Treatment
Advanced post-treatment smoothens the insert surface, significantly reducing friction and preventing the built-up edge (BUE) common in steel machining.
Decoding SNMG120408R-S Technical Nomenclature
S
Square
N
0° Relief
M
Tolerance
G
Hole/Fix
12
12.7mm Size
04
4.76mm Thick
08
0.8mm Rad.
R-S
Right/Breaker
3. Technical Specifications: Metric vs. Imperial
| Parameter |
Metric (ISO) |
Imperial Equivalent |
| Inscribed Circle (IC) |
12.7 mm |
1/2" (SNMG 432R) |
| Thickness (S) |
4.76 mm |
3/16" |
| Corner Radius (RE) |
0.8 mm |
1/32" |
| Grade Compatibility |
T9125 (CVD) |
Steel & Alloy Specialist |
Recommended Cutting Parameters (T9125)
-
Cutting Speed (Vc): 160 - 320 m/min (Ideally 250 m/min for alloy steel)
-
Feed Rate (f): 0.12 - 0.40 mm/rev
-
Depth of Cut (ap): 0.5 - 2.5 mm
*Note: Please ensure you are using a Right-Hand (R) tool holder. Proper alignment ensures the -S breaker performs optimally at higher feed rates.*
4. Product Applications
- Continuous turning of automotive transmission shafts.
- Finishing alloy steel flanges and precision hardware.
- B2B heavy machinery component production.
- High-volume CNC turning of carbon steel cylinders.
5. Tool Compatibility
Universal fit for standard ISO Right-Hand Turning Holders (External: DSBNR, PSSNR; Internal: S...-PSSNR). Specifically designed for SNMG 1204 pocket seats.
7. Why Choose CNCHome-Beyond?
Genuine Tungaloy
Original Japan Import
Industrial Expertise
CNC B2B Specialists
Fast Shipping
Reliable Global Delivery
Factory Ready
Bulk Quantity Availability
B2B Customer Feedback
⭐⭐⭐⭐⭐ "Workhorse Grade" - Robert T., UK
"T9125 is incredibly predictable. We run these on our Puma lathes for right-hand finishing passes. Great tool life."
⭐⭐⭐⭐⭐ "Excellent Surface Finish" - H. Bauer, Germany
"Authentic Japanese Tungaloy. The -S breaker handles alloy steel chips perfectly. Surfaces are smooth enough to skip grinding."
⭐⭐⭐⭐ "Very Sharp Edge" - K. Saito, Japan
"Consistent accuracy for my CNC production line. Very reliable for finishing operations."
⭐⭐⭐⭐⭐ "Reliable Supplier" - M. Silva, Brazil
"Order arrived quickly. These SNMG120408R inserts were exactly what we needed for our high-volume production."
⭐⭐⭐⭐⭐ "Stable Cutting" - Lim J., Singapore
"No vibration and stable chip control at 0.8mm radius. Best CVD grade for our carbon steel components."
8. FAQ - Professional Support
Q: Can I use this R-hand insert in a left-hand holder?
A: No. Proper chip evacuation and tool geometry require the hand of the insert (R) to match the hand of the tool holder.
Q: What is the difference between T9125 and T9225?
A: T9125 is more wear-resistant for continuous cuts, while T9225 is tougher for interrupted cuts or heavier roughing.
Q: Does this fit SNMG 432R holders?
A: Yes, SNMG 120408 is the exact metric equivalent to the Imperial SNMG 432 specification.
Industrial Tip: The Strength of T9125 Grade
The T9125 grade is engineered for a "balanced" life—offering high resistance to both heat and mechanical wear. While cermet grades like NS9530 are for the ultimate gloss, T9125 is the reliable workhorse for precision finishing where tool reliability is paramount. Trust Tungaloy Japan for your mass production needs. Experience world-class efficiency at your spindle.
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