Korloy TNMX160408L NC3020 (Left Hand) General Purpose Steel Turning Insert (10pcs)
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The Original Korloy TNMX160408L NC3020 is a highly versatile Left-Hand Triangular Turning Insert designed for General Purpose Steel Machining (P-Group). Utilizing the industry-standard NC3020 Grade, this insert provides an exceptional balance of wear resistance and impact toughness. The TNMX geometry is specifically engineered to improve chip breaking and reduce cutting resistance, making it ideal for semi-finishing and light roughing of carbon and alloy steels.
The Industry Standard for Steel: NC3020 is Korloy’s most popular CVD grade for a reason. It features a multi-layered coating that handles a wide range of cutting speeds and material hardness, making it the "set-and-forget" solution for daily steel turning tasks.
Technical Specifications (Metric & Imperial):
| ISO Designation | TNMX 160408L |
| Hand of Tool | Left Hand (L) |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.8 mm / (1/32") |
| Grade | NC3020 (Universal Steel Specialist CVD) |
Core Performance Benefits:
- Universal Application: Excels in everything from soft low-carbon steels to tougher alloy steels.
- Robust 0.8mm Radius: Offers excellent edge strength for varied depths of cut and moderate feed rates.
- Superior Chip Evacuation: The TNMX design creates smaller, manageable chips, preventing tool damage and surface scratching.
- Thermal Stability: The Al2O3 CVD coating layer provides a strong shield against heat, even during dry machining.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (1045) | 150-320 m/min | 0.15-0.40 mm/rev | 0.5-3.5 mm |
| Alloy Steel (4140) | 130-280 m/min | 0.12-0.35 mm/rev | 0.5-3.0 mm |
Compatible Tooling Systems:
Ensure use with 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: Choosing the Right Steel Grade
Korloy NC3020 vs. NC3120:
Maximum Stability. If you don't know the exact hardness of the steel or have a mix of materials, NC3020 is the best choice. It is tougher and more forgiving of machine vibration or unstable setups.
Maximum Wear Resistance. Switch to NC3120 only if you are cutting at very high speeds or dealing with pre-hardened alloy steels where the NC3020 is wearing out too quickly.
Pro Advice: For left-hand (L) inserts, always verify your CNC program's spindle rotation. Using an "L" insert on a standard "R" setup without reversing rotation will result in immediate tool failure.
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.