Korloy DNMG110404-HM NC3020 Steel Turning Insert, R0.4 (10pcs)
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The Original Korloy DNMG110404-HM NC3020 (ANSI Standard: DNMG 331) is a high-performance, double-sided 55° diamond insert optimized for the high-speed finishing and semi-finishing of Steel (P). Engineered with a premium CVD coating, the NC3020 grade provides an excellent thermal barrier and superior resistance to crater wear. Combined with the HM chipbreaker, this insert excels in chip control and maintains precise dimensional tolerances during long production runs.
Efficiency & Longevity: NC3020 is Korloy’s flagship grade for continuous steel turning. It is designed to maximize productivity by allowing higher cutting speeds (Vc) without sacrificing the integrity of the cutting edge.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | DNMG110404-HM |
| ANSI Code | DNMG 331 |
| Grade | NC3020 (CVD Coated for Steel) |
| Nose Radius | 0.4 mm (Precision Finishing) |
Core Performance Benefits:
- High-Speed Stability: The thick CVD coating protects the carbide substrate from heat deformation during high RPM operations.
- HM Chipbreaker: Designed for finishing to semi-finishing, offering sharp cutting action and reliable chip breaking even at lower feed rates.
- Exceptional Edge Life: Superior resistance to flank and crater wear in carbon steel and alloy steel.
- 4 Cutting Edges: As a negative geometry (DNMG) insert, it provides 4 usable edges for maximum cost-efficiency.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Low Carbon / Mild Steel | 200 - 380 m/min | 0.10 - 0.25 mm/rev | 0.5 - 2.5 mm |
| Alloy Steel (4140 / 4340) | 180 - 320 m/min | 0.08 - 0.22 mm/rev | 0.5 - 2.0 mm |
| High Carbon Steel | 150 - 280 m/min | 0.10 - 0.28 mm/rev | 0.8 - 3.0 mm |
Compatible Tool Holders:
Designed for 55-degree negative holders with 11-size pockets:
- External Holders: DDJNR/L 1616H11 / 2020K11 / 2525M11
- Boring Bars: S25S-DDUNR11 / S32T-DDUNR11
Steel Grade Pro-Tip: NC3020 vs. CN2000 (Cermet)
Choosing between Coated Carbide and Cermet for steel finishing:
The Versatile Performer. Best for 80% of steel turning. It is tougher than Cermet, making it safer for higher feed rates, deeper cuts, and slightly unstable machine conditions.
The Mirror Finish Specialist. Use Cermet for ultra-high-speed final finishing on stable machines. While brittle, it provides the best surface brightness and dimensional precision.
Machinist's Insight: If your machine setup is very rigid and you need the best possible finish, go with CN2000. If you need a reliable workhorse for varied steel parts, NC3020 is the most secure investment.
Packaging: 10 pieces per box.