Korloy MGMN400-M NC3020 4mm Double-Ended Grooving Insert for Steel (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy MGMN400-M NC3020 is a premium 4.0mm Double-Ended Grooving Insert engineered for High-Efficiency Steel Machining. Designed for stability and longevity, the NC3020 CVD grade features an optimized multi-layer coating that excels in resisting crater wear and thermal cracking. It is the ideal choice for workshops focusing on high-volume production of carbon steel and alloy steel components where downtime for tool changes must be minimized.
Stability Meets Speed: NC3020 is Korloy's benchmark for stable steel cutting. It allows for significantly higher surface speeds (Vc) compared to general-purpose grades, making it perfect for modern CNC lathes with high spindle capabilities.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MGMN400-M |
| Insert Width (w) | 4.0 mm |
| Grade | NC3020 (High-Speed Wear Resistant CVD) |
| Chipbreaker | -M (Stable Medium-Cutting Geometry) |
Core Performance Benefits:
- High Resistance to Crater Wear: The CVD coating remains stable under the intense heat generated by 4mm wide chips.
- 4.0mm Rigid Body: Provides the necessary strength for deeper radial grooves and parting of medium-to-large diameter bars.
- Excellent Surface Finish: The -M geometry effectively controls the chip flow, preventing scratches on the groove side walls.
- Proven Tool Life: NC3020 maintains its edge sharpness longer in continuous cuts than toughness-oriented grades.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Carbon Steel (45#/1045) | 130 - 240 m/min | 0.10 - 0.25 mm/rev |
| Alloy Steel (4140/SCM440) | 110 - 200 m/min | 0.08 - 0.20 mm/rev |
| Mild Steel (A3/1018) | 150 - 300 m/min | 0.12 - 0.28 mm/rev |
Compatible Tool Holders:
Pairs with heavy-duty 4.0mm MGEHR/L external holders:
- External Holders: MGEHR 2020-4 / 2525-4 / 3232-4
Tech Tip: NC3020 vs. NC3030 for 4mm Grooving
At a 4.0mm width, the heat and pressure are significant. Choose your grade based on stability:
The Wear Specialist. Best for stable CNC machines and continuous cuts. Choose this to increase production speed and get more parts per box.
The Tough Guardian. Best for interrupted cuts, heavy shocks, or manual lathes. Prioritizes safety over high-speed wear resistance.
Machinist's Pro Tip: For the MGMN400-M NC3020, don't be afraid to push the speed ($V_c$). If the insert is building up material on the edge (BUE), it's likely because the speed is too low. Increase the RPM to take full advantage of the NC3020 coating.
Packaging: 10 pieces per box.
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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.