Korloy TNMX160404L NC3120 (Left Hand) High-Speed Steel Turning Insert (10pcs)
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The Original Korloy TNMX160404L NC3120 is a specialized Left-Hand Triangular Turning Insert engineered for High-Performance Steel Machining (P-Group). Optimized with the NC3120 Grade, this insert features an advanced CVD coating designed to withstand the extreme temperatures of high-speed alloy steel turning. The TNMX geometry provides superior chip evacuation and surface quality, making it an essential tool for precision automotive and machinery components.
Designed for Precision & Endurance: NC3120 is Korloy's premier grade for alloy steel. Its dense coating structure prevents crater wear even during prolonged contact with tough-to-machine steels like 4140, 4340, and pre-hardened tool steels.
Technical Specifications:
| ISO Designation | TNMX 160404L |
| Hand of Tool | Left Hand (L) |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.4 mm / (1/64") |
| Grade | NC3120 (High-Wear Resistant CVD) |
Core Performance Benefits:
- Extended Tool Life: NC3120’s specialized Al2O3 coating layer acts as a thermal barrier, maintaining edge sharpness at high RPMs.
- Superior Surface Finish: The TNMX design allows for excellent chip control, preventing "bird-nesting" and protecting the workpiece surface.
- High Dimensional Stability: Ideal for automated production where frequent offsets are undesirable.
- Specialized Left-Hand Orientation: Specifically designed for back-turning and specialized CNC lathe tool configurations.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Alloy Steel (4140/4340) | 180-330 m/min | 0.08-0.25 mm/rev | 0.3-2.5 mm |
| Carbon Steel (1045) | 200-380 m/min | 0.10-0.30 mm/rev | 0.5-3.0 mm |
Compatible Tool Holders:
Note: Requires Left-Hand (L) or Neutral (N) tool holders designed for 16-size inserts:
- External Holders: MTJNL 2020K16 / MTJNL 2525M16
- Boring Bars: S25S-WTJNL16 / S32T-WTJNL16
Machinist Tip: The NC3120 Advantage
Optimizing your steel turning workflow:
High Speed, Low Wear. This grade is optimized for high-speed finishing where heat is the enemy. It excels in keeping a sharp edge on alloy steels that would normally dull a standard NC3020 insert prematurely.
Ensure your machine's spindle direction (M03/M04) and tool post orientation match the Left-Hand design to take full advantage of the TNMX chipbreaker's geometry.
Pro Advice: For the best results in alloy steel finishing, use a Constant Surface Speed (CSS) to maintain a uniform Vc, ensuring consistent surface finish from the largest to the smallest diameter of your part.
Packaging: 10 pieces per box.
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Technical FAQ & Buying Guide
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.
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.
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.
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.
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.
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.