Korloy TNMG160408-HM NC3120 (TNMG 332-HM) Long-Life Insert for Alloy Steel (10pcs)
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The Original Korloy TNMG160408-HM NC3120 (ANSI: TNMG 332-HM) is a high-performance Triangular Turning Insert engineered for Hardened and Alloy Steel Machining (P-Group). Featuring the specialized NC3120 Grade, this tool offers an optimized CVD coating layer that provides exceptional resistance to high-temperature oxidation and friction. The HM (Medium Cutting) Chipbreaker and robust 0.8mm radius make it the ultimate choice for high-speed production runs on alloy steels, mold steels, and pre-hardened components.
Maximum Wear Resistance: NC3120 is Korloy's answer to the challenges of machining high-strength alloys. It is specifically formulated to minimize "crater wear" and "flank wear" at high cutting speeds, ensuring that your dimensions remain consistent across hundreds of parts without frequent tool changes.
Technical Specifications (Metric & Imperial):
| ISO Designation | TNMG 160408-HM |
| ANSI Designation | TNMG 332-HM |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.8 mm / (1/32") |
| Grade | NC3120 (Ultra-High Speed CVD for Alloy Steel) |
Core Performance Benefits:
- Engineered for Alloy Steel: Superior performance on 4140, 4340, 8620, and other high-tensile materials.
- Stable Edge Toughness: The 0.8mm (332) radius handles aggressive feed rates and helps prevent chipping in continuous-to-lightly interrupted cuts.
- Advanced Heat Shield: Thick CVD Al2O3 layer protects the carbide substrate from thermal deformation during high-speed dry machining.
- 6 Cutting Edges: Double-sided triangular design provides the best economic value for industrial production.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Alloy Steel (4140/SCM440) | 160-320 m/min (525-1050 sfm) | 0.15-0.45 mm/rev (.006-.018 ipr) | 0.8-4.0 mm (.032-.157") |
| Tool Steel (H13/D2 Soft) | 120-220 m/min (390-720 sfm) | 0.12-0.35 mm/rev (.005-.014 ipr) | 0.8-3.0 mm (.032-.118") |
Compatible Tooling Systems:
- External Lathe Holders: MTJNR 2020K16 / MTJNR 2525M16 (ANSI 12-4B / 16-4D)
- Heavy Boring Bars: S25S-WTJNR16 / S32T-WTJNR16
Machinist Tip: NC3120 vs. NC3020 Efficiency
When to choose the NC3120 Grade:
The Efficiency King. If your shop processes alloy steels (4140, etc.) in large quantities, NC3120 is worth the upgrade. It withstands higher speeds and provides 20-30% longer life in heat-intensive alloy cutting than NC3020.
For standard mild steel or general maintenance where material types vary hourly, NC3020 is more versatile. NC3120 is a specialized "formula" for those looking for the absolute limit of tool life in alloy steels.
Pro Advice: To maximize the benefits of NC3120, ensure you are using stable workholding. In alloy steel, chatter can lead to micro-chipping; the 0.8mm radius on this model helps dissipate force, but rigidity is still key for high-speed success.
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.