Korloy DNMG150404-HM NC3120 Universal Steel Turning Insert, R0.4 (10pcs)
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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.