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.