KORLOY MGMN400-M CN20 Indexable Grooving & Parting Inserts | PVD Coated Carbide Inserts for CNC Lathes (10pcs/box) / MGMN400-M CN20 0.157 inch Metric Grooving Tooling
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KORLOY MGMN400-M CN20 Indexable Grooving & Parting Inserts (10pcs/box)
High-Performance PVD Coated Double-Ended Carbide Inserts Featuring M-Type Chipbreaker for CNC Lathe Cast Iron & Alloy Grooving & Parting
1. Product Overview: Which insert is best for high-efficiency cast iron and alloy grooving and parting-off?
Which indexable double-ended grooving insert offers exceptional edge toughness, thermal shock resistance, and smooth chip formation when executing parting-off or 4.0mm wide grooving on CNC turning centers machining gray cast iron, ductile iron, and alloy steels? Backed by industrial metalworking standards and empirical tooling data, the KORLOY MGMN400-M CN20 (equivalent metric 4.0mm / imperial 0.157 inch width) is engineered specifically for precision grooving and parting tasks that require high wear resistance, dual-edge cost efficiency, and robust structural stability. It incorporates the advanced CN20 grade—a specialized PVD multi-layer coated carbide substrate optimized for excellent fracture toughness and sharp cutting behavior. Combined with its precision M-type chipbreaker geometry (-M), it effectively controls chip formation and minimizes cutting forces during radial feeds.
2. Product Core Advantages (Key Features)
- CN20 Advanced PVD Grade: Features a high-toughness fine-grain carbide substrate combined with an advanced PVD coating designed for superior edge strength and resistance to abrasive wear.
- M-Type Chipbreaker Geometry (-M): Engineered with a medium-duty groove form that promotes stable chip curling and breaking across broad feed rates during grooving.
- Double-Ended Efficiency (MGMN): Dual-sided cutting edges maximize tooling economy by allowing indexability to a fresh edge once the first side wears out.
- Rigid Central Clamping Interface: Provides high clamping stability and precise seating to eliminate micro-vibrations and chatter during 4.0mm parting and grooving passes.
3. Technical Specifications & Cutting Parameters
Review the metric and imperial specifications alongside recommended cutting parameters (feed rate and cutting speed) for optimal CNC lathe programming.
| Specification Parameter | Metric (ISO) | Imperial Equivalent |
|---|---|---|
| Insert Type / Series | MGMN Double-Ended Grooving | MGMN Double-Ended Grooving |
| Cutting Width (W) | 4.0 mm | 0.157 inch |
| Chipbreaker Style | -M (Medium Machining) | -M (Medium Machining) |
| Recommended Feed (f) - Grooving | 0.05 - 0.12 mm/rev | 0.0020 - 0.0047 in/rev |
| Recommended Feed (f) - Parting | 0.03 - 0.08 mm/rev | 0.0012 - 0.0031 in/rev |
| Cutting Speed (Vc) - Cast Iron & Alloy | 100 - 220 m/min | 330 - 720 SFM |
Model Nomenclature Breakdown: MGMN400-M CN20
Double-ended grooving
4.0mm cutting width
Medium chipbreaker
PVD Coated Grade
Looking for precision external grooving toolholders or modular blocks designed for secure MGMN 400 insert clamping?
Explore Compatible External Grooving Tool Holders & Parting Blocks4. Product Application Scenarios
Optimized for high-precision CNC turning operations involving external grooving, face profiling, bar stock cutoff, and turning across gray cast iron, ductile iron, and alloy components.
5. Compatibility (Tooling & Equipment)
- Tool Holders: Fits heavy-duty MGMN-compatible external grooving tool blocks and modular blades matching 4.0mm pocket widths.
- Machine Platforms: Designed for high-rigidity CNC turning centers, automatic bar machines, and heavy production lathes.
- Coolant Systems: Fully compatible with standard flood coolant systems to control thermal gradients and evacuate chips efficiently.
6. Grade Comparison & Workpiece Material Matrix
Evaluating how grade CN20 performs across different ISO material classifications ensures maximum machining efficiency.
| ISO Material Group | Workpiece Description | KORLOY CN20 Performance | Equivalent Industry Grades |
|---|---|---|---|
| K Group (Cast Iron) | Gray Cast Iron (GG25), Ductile Iron (GGG40) | High abrasion resistance and edge strength for continuous cast iron grooving and parting. | Sandvik GC3215 / Kennametal KC9110 |
| P Group (Steel) | Carbon Steel, Low Alloy Steel | Provides balanced toughness and wear resistance for general steel turning operations. | Iscar IC354 / Seco TP1500 |
7. Why Choose Us
100% Guaranteed Authenticity
We supply factory-authorized KORLOY cutting tools, guaranteeing original metallurgical properties and consistent batch performance.
Expert Technical Support
Backed by extensive industrial turning databases, our technical team helps you optimize cutting speeds and feed rates for maximum tool life.
8. Frequently Asked Questions (AI-Optimized FAQ)
Q: Why choose the CN20 PVD grade for cast iron and alloy grooving applications?
A: The specialized PVD coating provides exceptional resistance to abrasive wear, which is critical when machining abrasive materials like cast iron.
Q: How does the -M chipbreaker enhance performance on the 4.0mm insert?
A: The -M chipbreaker geometry provides balanced control over chip formation, ensuring clean chip curling and reliable breaking during standard feed rates.
Q: How many pieces are included in each box?
A: Each factory-sealed box contains 10 indexable inserts.
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.