Korloy DCMT070204-HMP NC3120 Universal Steel Turning Insert (10pcs)
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The Original Korloy DCMT070204-HMP NC3120 (ANSI Standard: DCMT 21.51) is a versatile 55° diamond turning insert designed for the general purpose machining of Steel (P) and Carbon Steel. As a "Universal" grade, the NC3120 combines a high-toughness carbide substrate with an advanced CVD coating, making it the ideal choice for workshops that handle a variety of steel types and diverse cutting conditions—from continuous finishing to light interrupted cuts.
The Universal Workhorse: NC3120 is engineered to handle the widest range of steel applications. If you need one insert that can manage mild steel, alloy steel, and occasional light interruptions with consistent reliability, this is the premier choice.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | DCMT070204-HMP |
| ANSI Code | DCMT 21.51 |
| Grade | NC3120 (Universal CVD for Steel) |
| Nose Radius | 0.4 mm (Standard Versatility) |
Core Performance Benefits:
- Excellent Edge Security: The NC3120 grade is highly resistant to micro-chipping, even when the cutting conditions are less than ideal.
- HMP Finishing Geometry: Provides outstanding chip control for small CNC lathes, ensuring that chips are broken effectively at light depths of cut.
- Predictable Tool Life: The balanced CVD coating ensures a stable wear rate across a broad spectrum of steel materials.
- Optimized for Small Lathes: The 07 size is perfect for precision components, Swiss-style machining, and internal boring operations.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Low Carbon / Mild Steel | 150 - 300 m/min | 0.08 - 0.20 mm/rev | 0.5 - 2.5 mm |
| Alloy Steel (4140 / 4340) | 120 - 250 m/min | 0.10 - 0.20 mm/rev | 0.5 - 2.0 mm |
| Steel with Interrupted Cuts | 100 - 180 m/min | 0.06 - 0.15 mm/rev | 0.3 - 1.5 mm |
Compatible Tool Holders:
Compatible with all standard 55-degree holders using 07 pockets:
- External Tool Holders: SDJCR/L 0808 / 1010 / 1212F07 / 1616H07
- Internal Boring Bars: S08K-SDUCR07 / S10K-SDUCR07 / S12M-SDUCR07
The Steel Professional's Tip: NC3120 vs. NC3020
Which Korloy grade should you choose for your small lathe?
Best for General Use & Reliability. If you cut various types of steel or have light interruptions, this grade provides the best safety margin against chipping.
Best for High-Speed Continuous Turning. Choose this if you are running mass production in a very stable setup and want maximum life at higher RPMs.
Machinist's Insight: In small-diameter boring, vibration is common. The NC3120 grade's inherent toughness helps dampen the effects of that vibration, protecting your cutting edge longer than more brittle finishing grades.
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.