Tungaloy TNMG220408L-S T9125 Left-Hand CVD Coated Carbide Turning Insert for Steel - BEYOND

Tungaloy TNMG220408L-S T9125 Left-Hand CVD Coated Carbide Turning Insert for Steel

$99.47 USD

Price shown is a starting point. Contact us for a precise quote based on your requirements.

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Description

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
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.

© Technical Data by cnchome-beyond.com - Global CNC Tool Authority

Technical FAQ & Buying Guide

Are your carbide inserts interchangeable with major brands like Sandvik, Iscar, or Kennametal?

Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.

How do I choose the correct insert grade and chipbreaker for machining Stainless Steel (M) vs. Carbon Steel (P)?

We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:

  • For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
  • For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
What are the recommended cutting speed (Vc) and feed rate (f) parameters to maximize tool life?

The optimal cutting parameters vary depending on the workpiece hardness and operation type:

  • For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
  • For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Do you offer bulk discounts or wholesale pricing for machine shops and distributors?

Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.

What is your international shipping policy and typical lead time for orders?

We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.

How do you guarantee the quality and tolerance precision of your CNC tools?

All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.