Korloy DCMT11T302-HMP NC3020 Steel Finishing Turning Insert (10pcs)
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The Original Korloy DCMT11T302-HMP NC3020 (ANSI Standard: DCMT 32.50.5) is a premium CVD-coated turning insert engineered for high-precision finishing of Steel (P) and Carbon Steel. The combination of the 11T3 structural stability and a fine 0.2mm nose radius makes it the ultimate choice for achieving mirror-like surface finishes and sharp internal profiles. The NC3020 CVD grade is optimized for high-speed continuous cutting, offering industry-leading resistance to crater wear and heat deformation.
Ultra-Precision Finishing: The 0.2mm radius (R0.2) significantly reduces radial cutting forces, making this insert ideal for machining slender workpieces, thin-walled tubes, and parts requiring high dimensional accuracy without vibration.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | DCMT11T302-HMP |
| ANSI Code | DCMT 32.50.5 |
| Grade | NC3020 (Premium CVD for Steel) |
| Nose Radius | 0.2 mm (Fine Detail) |
Core Performance Benefits:
- HMP Chipbreaker Geometry: Specially designed for finishing, providing excellent chip curling and breaking even at very light depths of cut.
- High-Speed Wear Resistance: The CVD coating allows for significantly higher spindle speeds, increasing productivity while maintaining a long tool life.
- Exceptional Surface Gloss: Optimized edge preparation ensures clean cutting action and prevents surface scratching.
- Stable Machining: The NC3020 substrate provides the necessary hardness to resist edge deformation during long continuous finishing cycles.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Low Carbon/Mild Steel | 200 - 380 m/min | 0.05 - 0.12 mm/rev | 0.1 - 1.2 mm |
| Alloy Steel (4140/4340) | 150 - 300 m/min | 0.04 - 0.10 mm/rev | 0.1 - 1.0 mm |
| High Carbon Steel | 120 - 250 m/min | 0.05 - 0.15 mm/rev | 0.2 - 1.5 mm |
Compatible Tool Holders:
Fits all standard 55-degree diamond holders with 11T3 pockets:
- External Holders: SDJCR/L 1212 / 1616 / 2020K11
- Internal Boring Bars: S16Q-SDUCR11 / S20R-SDUCR11 / S25S-SDUCR11
Machinist's Selection Tip: NC3020 vs. NC3120
Choosing the right grade for steel finishing:
Best for Continuous Machining. Its higher wear resistance is perfect for long cuts where dimensional stability is critical. Excellent for high-speed CNC production.
Best for Versatility. If your cut involves light interruptions (like holes or slots) or if your setup isn't perfectly rigid, NC3120 offers better toughness against chipping.
Pro Insight: When using the R0.2 radius, ensure your machine spindle is running at high RPM to maintain the surface speed (Vc). This helps the HMP chipbreaker function effectively and produces the cleanest finish.
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.