Korloy TNMG160404-HM NC3020 (TNMG 331-HM) Steel Turning Insert for Medium Cutting (10pcs)
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The Original Korloy TNMG160404-HM NC3020 (ANSI: TNMG 331-HM) is a high-performance, double-sided Triangular Turning Insert engineered for General Steel Machining (P-Group). Featuring the industry-proven NC3020 CVD Coating, this insert excels in high-speed operations where heat resistance and crater wear protection are paramount. The HM Chipbreaker is specifically designed for medium cutting ranges, providing excellent chip breaking and edge reliability across a wide variety of carbon and alloy steels.
Medium Cutting Workhorse: The HM geometry balances sharpness with edge strength. It is the perfect "all-rounder" for workshops processing 1045, 4140, and 8620 steels, offering a stable cutting action and consistent tool life even during long production runs.
Technical Specifications (Metric & Imperial):
| ISO Designation | TNMG 160404-HM |
| ANSI Designation | TNMG 331-HM |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.4 mm / (1/64") |
| Grade | NC3020 (Premium CVD for Steel) |
Core Performance Benefits:
- Advanced CVD Multi-Layer Coating: Optimized Al2O3 and TiCN layers provide a formidable barrier against high cutting temperatures.
- HM Geometry: Features a reinforced land that prevents edge chipping while maintaining high chip-breaking efficiency.
- Precision Finishing: The 0.4mm (331) radius is ideal for achieving tight tolerances and fine surface finishes on medium-sized workpieces.
- 6 Usable Edges: Double-sided design offers a highly economical solution for high-volume manufacturing.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (1045/A3) | 180-350 m/min (590-1150 sfm) | 0.10-0.35 mm/rev (.004-.014 ipr) | 0.5-3.5 mm (.020-.138") |
| Alloy Steel (4140/SCM440) | 150-300 m/min (490-985 sfm) | 0.10-0.30 mm/rev (.004-.012 ipr) | 0.5-3.0 mm (.020-.118") |
Compatible Tooling Systems:
- External Lathe Holders: MTJNR 2020K16 / MTJNR 2525M16 (ANSI 12-4B / 16-4D)
- Internal Boring Bars: S25S-WTJNR16 / S32T-WTJNR16
Machinist Tip: Choosing your TNMG1604 Geometry
How the HM chipbreaker fits into your workflow:
The Generalist. Use the HM for 80% of your steel turning. It handles varying depths of cut and provides reliable chip breaking at both high and medium feed rates.
Switch to the HA geometry if you are working with very soft, gummy steel and need to prevent burrs. Stick with HM for harder alloy steels where edge strength is necessary to prevent premature wear.
Pro Advice: NC3020 is a high-speed grade. If you experience "chipping" at the edge, you may be running too slow, causing built-up edge. Increase your Vc (cutting speed) to take full advantage of the CVD coating's lubricity.
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.