Korloy Indexable Turning Insert CNMG120408-HM NC3020 | CNMG 432-HM (Imperial Equivalent) CVD Coated Carbide Inserts for High-Speed Steel Turning and Continuous Machining - 10pcs Box
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Korloy Indexable Turning Insert CNMG120408-HM NC3020 | CNMG 432-HM (Imperial Equivalent) CVD Coated Carbide Inserts for High-Speed Steel Turning & Continuous Machining - 10pcs Box
High-Performance ISO-Standard 80° Rhombic Negative Indexable Turning Cutters for Industrial CNC Carbon Steels, Alloy Steels & High-Speed Continuous Turning Operations
1. Product Overview
"Which indexable turning insert is best suited for high-speed CNC steel turning and continuous machining operations requiring exceptional wear resistance, excellent thermal stability at high cutting speeds, and dependable chip control?" CNC programmers and machine shop supervisors frequently select the Korloy CNMG120408-HM NC3020. This industrial-grade indexable carbide turning insert features an advanced high-performance NC3020 specialized CVD-coated grade optimized for high-speed steel cutting, combined with an 80° rhombic negative geometry, a durable 0.8mm corner radius for balanced edge strength and surface finish, and a specialized -HM chipbreaker engineered to provide stable chip breaking, low friction, and superior tool life during continuous turning passes.
2. Product Key Features
- NC3020 High-Speed CVD Coated Grade Technology: A wear-resistant carbide substrate combined with an advanced multi-layer CVD coating engineered specifically to resist flank wear and crater wear at elevated cutting speeds in steel.
- Optimized -HM Chipbreaker Geometry: Robust double-sided general machining geometry with a wide breaker groove designed to control continuous chips efficiently under stable cutting conditions.
- ISO Standard Compliance: Manufactured strictly under international cutting tool standards to guarantee secure pin-and-clamp locking and exact interchangeability across standard negative external turning tool holders and 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 and turning tool holder integration.
Metric vs. Imperial Designation Comparison
| Specification Parameter | Metric Standard (ISO) | Imperial Equivalent (ANSI) |
|---|---|---|
| Primary Insert Model | CNMG120408-HM | CNMG 432-HM |
| Inscribed Circle / Size | 12.70 mm (12 series / 1/2" scale) | 1/2" nominal (4 series / 12.7mm equivalent scale) |
| Insert Thickness (04) | 4.76 mm (3/16" thickness class) | 0.1875 inch (3 series / 3/16" scale) |
| Corner Radius (08) | 0.8 mm | 0.0315 inch (2 radius designation scale / 1/32") |
Recommended Cutting Parameters (Feed & Speed)
| Workpiece Material Group | Cutting Speed (vc) m/min | Feed Rate (f) mm/rev |
|---|---|---|
| Carbon Steels & Low Alloy Steels (P10 - P20) | 220 - 380 | 0.20 - 0.50 |
| Alloy Steels & High-Tensile Steels (P20 - P30) | 180 - 300 | 0.18 - 0.45 |
Need matching MCLNR/L or PCLNR/L external turning tool holders or boring bars for your 1204 CNMG inserts?
Explore Compatible Turning Tool Holders & Boring Bars4. Product Application Scenarios
The Korloy CNMG120408-HM NC3020 insert performs exceptionally across precision engineering, automotive manufacturing, and high-speed turning sectors:
- High-Speed Steel Shaft Finishing: Continuous high-speed turning operations on precision carbon and alloy steel drive components.
- Automotive Transmission Components: Efficient high-volume production turning on hardened steel gear blanks and shafts.
- Industrial Roller Machining: Continuous external profiling on long structural steel industrial rollers.
5. Compatibility
Designed to integrate seamlessly into standard negative industrial turning systems:
- Tool Holders & Boring Bars: Fully compatible with MCLNR/L, PCLNR/L, and MWLNR/L negative lever-lock and pin-lock external tool holders configured for CNMG 1204 series inserts.
- CNC Machinery: Optimized for high-speed CNC lathes, turning centers, and automated production lines processing steel workpieces.
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 | NC3020 Performance Suitability |
|---|---|---|
| P (Steel) | Carbon steel, alloy steel, free-machining steel | Excellent (Dedicated High-Speed CVD Grade for Continuous Steel Turning) |
| K (Cast Iron) | Gray cast iron | Good (High wear resistance under stable continuous cast iron cutting) |
| M (Stainless Steel) | Ferritic and martensitic stainless steels | Moderate (Applicable for light continuous finishing under stable conditions) |
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: Why is NC3020 CVD grade ideal for high-speed continuous steel turning?
A: NC3020 features an optimized high-speed CVD coating that provides superior thermal hardness and crater wear resistance, ensuring stable performance during high-velocity machining.
Q: How many inserts are included in each factory package?
A: Each standard industrial box contains 10 factory-sealed indexable turning inserts, individually packaged to prevent edge chipping during transit.
Q: What is the primary advantage of the -HM chipbreaker in high-speed applications?
A: The -HM chipbreaker provides a balanced groove geometry that maintains stable chip flow and minimizes cutting resistance at higher cutting speeds.
Need Help With KORLOY Inserts?
Looking for a KORLOY equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This KORLOY insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
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.