Korloy DNMG110404-HM NC3120 Universal Steel Turning Insert, R0.4 (10pcs)
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The Original Korloy DNMG110404-HM NC3120 (ANSI Standard: DNMG 331) is the most balanced 55° diamond insert for general-purpose steel turning. If you are looking for a single grade that can handle both continuous and light interrupted cuts, the NC3120 is your top choice. This insert features a R0.4 nose radius for high-precision finishing and an advanced CVD coating that provides a perfect equilibrium between hardness and impact strength.
The All-Rounder: NC3120 is designed to be the "Standard" grade for workshops. It reduces the need for frequent insert changes when switching between different types of steel or varying cutting conditions.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | DNMG110404-HM |
| ANSI Code | DNMG 331 |
| Grade | NC3120 (Universal CVD for Steel) |
| Nose Radius | 0.4 mm (High Precision) |
Core Performance Benefits:
- Balanced Performance: Exceptional resistance to both flank wear and mechanical chipping.
- Stable Tool Life: Provides predictable results across Carbon Steel, Alloy Steel, and even some Tool Steels.
- High Surface Quality: The HM chipbreaker is optimized for fine chip control, leaving a smooth finish even in general-duty applications.
- 4 Cutting Edges: Double-sided negative geometry offers maximum cost-efficiency.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (General) | 160 - 300 m/min | 0.10 - 0.25 mm/rev | 0.5 - 2.5 mm |
| Alloy Steel (Medium Hardness) | 140 - 250 m/min | 0.08 - 0.22 mm/rev | 0.4 - 2.0 mm |
| Interrupted Steel Cuts | 120 - 200 m/min | 0.10 - 0.20 mm/rev | 0.5 - 2.0 mm |
Compatible Tool Holders:
Fits all standard 55-degree negative holders (11-size pocket):
- External Holders: DDJNR/L 1616H11 / 2020K11 / 2525M11
- Boring Bars: S25S-DDUNR11 / S32T-DDUNR11
The Steel Grade Trio: 3020 vs. 3120 vs. 3030
How to choose the right CVD grade for your steel job:
Best for Continuous Turning. High wear resistance for long life at high RPMs.
Best for Mixed Operations. The perfect middle ground for efficiency and safety.
Best for Heavy Interruptions. Use this for keyways and heavy forged skins.
Machinist's Insight: If you don't want to overthink your setup, NC3120 is the "Safe Bet" that works in almost every steel turning scenario.
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.