Korloy DNMG150404-HM NC3120 Universal Steel Turning Insert, R0.4 (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy DNMG150404-HM NC3120 (ANSI Standard: DNMG 431) is the premier "Universal" choice for steel turning applications. When you need a reliable insert that performs consistently across different steel grades and varying machine conditions, the NC3120 is the answer. It features a precision 0.4mm nose radius for superior surface finishes and an advanced CVD coating designed to handle both continuous and light interrupted cuts with ease.
Maximum Versatility: NC3120 is Korloy's most balanced grade. It bridges the gap between high-speed wear resistance and heavy-duty toughness, making it the ideal choice for workshops that handle a wide variety of steel components.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | DNMG150404-HM |
| ANSI Code | DNMG 431 |
| Grade | NC3120 (Universal CVD for Steel) |
| Nose Radius | 0.4 mm (Finishing Precision) |
Core Performance Benefits:
- Balanced Carbide Substrate: Specifically engineered to prevent micro-chipping while maintaining a sharp edge for finishing.
- Thermal Shock Resistance: The multi-layer CVD coating protects against the heat of continuous cuts and the mechanical impact of interruptions.
- HM Chipbreaker: Excellent chip control at shallow depths of cut, ensuring clean surface finishes and preventing "bird-nesting."
- Economical 4-Edge Design: Double-sided negative geometry provides 4 usable edges, lowering the cost per component.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (S45C / 1045) | 180 - 320 m/min | 0.08 - 0.20 mm/rev | 0.2 - 2.0 mm |
| Alloy Steel (4140 / 4340) | 150 - 260 m/min | 0.05 - 0.18 mm/rev | 0.2 - 1.5 mm |
| Steel with Light Interruption | 120 - 220 m/min | 0.10 - 0.22 mm/rev | 0.5 - 2.0 mm |
Compatible Tool Holders:
Fits all standard 55-degree negative holders for 15-size inserts:
- External Turning Holders: DDJNR/L 2020K15 / 2525M15 / 3232P15
- Internal Boring Bars: S25S-DDUNR15 / S32T-DDUNR15 / S40U-DDUNR15
Steel Grade Choice: NC3120 vs. NC3020
Which grade should you choose for finishing steel?
Best for Stability & Reliability. If you are not running in a pure high-speed mass production environment, or if your machine has slight vibrations, NC3120 is the safer bet to prevent unexpected breakage.
Best for Continuous Production. Use this grade only when the machine is very rigid and the cut is perfectly smooth. It offers higher wear resistance for long finishing passes on clean parts.
Machinist's Pro Tip: For the DNMG150404, using NC3120 ensures you can handle the "unknown" variables of a new job without worrying about edge chipping.
Packaging: 10 pieces per box.
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.