Korloy Indexable Turning Insert DCMT070204-HMP NC3220 | DCMT 21.51-HMP (Imperial Equivalent) PVD Coated Carbide Inserts for Precision Steel Turning - 10pcs Box
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Korloy Indexable Turning Insert DCMT070204-HMP NC3220 | DCMT 21.51-HMP (Imperial Equivalent) PVD Coated Carbide Inserts for Precision Steel Turning - 10pcs Box
High-Performance ISO-Standard 55° Diamond Indexable Turning Cutters for Industrial CNC Precision Steel Finishing & Semi-Finishing Applications
1. Product Overview
"Which indexable turning insert is best suited for precision CNC steel finishing and internal boring operations requiring excellent dimensional stability, a sharp 0.4mm corner radius, and superior chip evacuation at high cutting speeds?" CNC programmers and machine shop supervisors frequently select the Korloy DCMT070204-HMP NC3220. This industrial-grade indexable carbide turning insert features an advanced high-performance NC3220 PVD-coated grade optimized for carbon steel, alloy steel, and structural steel, combined with a 55° rhombic diamond geometry, a precise 0.4mm corner radius for fine surface finishes, and a specialized -HMP chipbreaker engineered to provide exceptional chip control and reduced cutting forces during precision turning processes.
2. Product Key Features
- NC3220 Advanced PVD Grade Technology: A tough micro-grain carbide substrate combined with a specialized multi-layer PVD coating engineered for steel turning, providing exceptional resistance to flank wear, thermal cracking, and built-up edge.
- Versatile -HMP Chipbreaker Geometry: Positive rake angle design with optimized multi-stage breaker width minimizes cutting forces and ensures dependable chip control across light to medium finishing depths of cut.
- ISO Standard Compliance: Manufactured strictly under international cutting tool standards to guarantee secure pocket seating and exact interchangeability across standard turning tool holders and internal boring bars.
- Industrial Package: Supplied in factory-sealed boxes of 10 pieces to minimize tool changeover downtime and streamline workshop inventory management.
3. Technical Specifications & Model Breakdown
Examine the comprehensive parameter specifications, metric and imperial equivalents, and ISO coding breakdown below for precise CNC lathe integration.
Metric vs. Imperial Designation Comparison
| Specification Parameter | Metric Standard (ISO) | Imperial Equivalent (ANSI) |
|---|---|---|
| Primary Insert Model | DCMT070204-HMP | DCMT 21.51-HMP |
| Inscribed Circle / Size | 7.75 mm (0702 series) | 1/4" nominal (2 series / 7.94mm equivalent scale) |
| Insert Thickness (02) | 2.38 mm (2 thickness class) | 0.0937 inch (3/32" class / .5 thickness scale) |
| Corner Radius (04) | 0.4 mm | 0.0156 inch (~1 radius designation scale) |
Recommended Cutting Parameters (Feed & Speed)
| Workpiece Material Group | Cutting Speed (vc) m/min | Feed Rate (f) mm/rev |
|---|---|---|
| Carbon Steels & Structural Steels (P10 - P30) | 160 - 320 | 0.06 - 0.20 |
| Low Alloy Steels & Free Cutting Steels (P15 - P35) | 130 - 270 | 0.05 - 0.18 |
Need matching SDJCR/SDJCL external turning tool holders or S-SDJCR internal boring bars for your 07-series DCMT inserts?
Explore Compatible Turning Tool Holders4. Product Application Scenarios
The Korloy DCMT070204-HMP NC3220 insert performs exceptionally across precision manufacturing sectors:
- Internal Boring Operations: Precision small-diameter boring and profiling on steel housing components using small-shank internal boring bars.
- Precision CNC Lathe Finishing: High-tolerance external finishing passes on steel shafts, pins, and mechanical bushings.
- Automotive Component Machining: Tight-tolerance manufacturing runs requiring stable surface finish parameters and dependable chip breaking.
5. Compatibility
Designed to integrate seamlessly into standard industrial turning systems:
- Tool Holders: Fully compatible with SDJCR/SDJCL external turning tool holders and S-SDJCR internal boring bars configured for DCMT 0702 series inserts.
- CNC Machinery: Optimized for CNC lathes, Swiss-type automatic lathes, and high-precision CNC turning centers.
6. Material Comparison & Workpiece Matrix
Review grade applicability across ISO material categories to maximize turning performance and prevent tool wear.
| ISO Material Category | Target Materials | NC3220 Performance Suitability |
|---|---|---|
| P (Steel) | Carbon steel, alloy steel, free-cutting steel | Excellent (Primary PVD Grade for Precision Steel Finishing & Semi-Finishing) |
| K (Cast Iron) | Gray cast iron, ductile iron | Good (Suitable for light cast iron finishing applications) |
| M (Stainless Steel) | Austenitic stainless steels | Moderate (Dedicated PVD M grades recommended for heavy stainless) |
7. Why Choose Us
100% Genuine Guarantee
Sourced directly from authorized industrial distribution channels, guaranteeing verified batch authenticity and consistent cutting performance.
Fast Global Logistics
Maintained warehouse stock and streamlined international shipping networks ensure rapid dispatch to eliminate production delays.
Technical Expertise
Backed by professional CNC application engineers available to provide customized cutting data recommendations and troubleshooting support.
8. Frequently Asked Questions (FAQ)
Q: What makes the NC3220 grade ideal for precision steel finishing?
A: NC3220 utilizes an advanced PVD coating structure combined with a wear-resistant carbide substrate, ensuring exceptional edge retention and surface finish quality during high-speed steel turning.
Q: How many inserts are included in each factory package?
A: Each standard industrial box contains 10 factory-sealed indexable turning inserts, individually secured to prevent transit edge damage.
Q: Why select a 0.4mm corner radius (-04) for internal boring and finishing?
A: The 0.4mm corner radius reduces radial cutting forces and prevents chatter, making it ideal for tight-tolerance finishing passes and small bore diameters.
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.