Korloy MRMN400-M NC3020 4mm Full Radius R2.0 CVD Steel Profiling Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy MRMN400-M NC3020 is a heavy-duty 4.0mm Full Radius (R2.0) Profiling Insert designed for high-efficiency Steel (P) machining. Featuring the advanced NC3020 CVD coating, this insert is built to withstand the intense heat of high-speed continuous cutting. The Full Radius (Round Nose) geometry combined with the -M (Medium) chipbreaker allows for exceptional chip control and surface finish when performing deep contouring and heavy profiling on carbon and alloy steels.
Engineered for Productivity: The NC3020 grade utilizes a thick Al2O3 CVD coating that provides a superior thermal barrier. This allows for significantly higher cutting speeds compared to PVD grades, making it the top choice for mass production where cycle time reduction is critical.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MRMN400-M |
| Insert Shape | Full Radius (Round Nose) |
| Width / Radius | 4.0 mm / R2.0 |
| Grade | NC3020 (Premium Steel CVD) |
Core Performance Benefits:
- Large 4.0mm Rigid Body: Maximum stability for deep radial plunging and wide lateral profiling.
- CVD Wear Resistance: Exceptional resistance to cratering and flank wear in high-temperature steel cutting.
- Optimized -M Chipbreaker: Effectively manages chips across a wide variety of carbon steels, preventing tool entanglement.
- Flawless 3D Contouring: The full R2.0 radius ensures smooth transitions and high surface integrity on curved profiles.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Carbon Steel (1045 / S45C) | 130 - 230 m/min | 0.10 - 0.25 mm/rev |
| Alloy Steel (4140 / 42CrMo) | 100 - 180 m/min | 0.08 - 0.20 mm/rev |
| Ductile Cast Iron | 110 - 200 m/min | 0.12 - 0.28 mm/rev |
Compatible Tool Holders:
Precision 4.0mm seat fit for standard Right-Hand holder systems:
- External Holders: MGEHR 2525-4 / 3232-4
- Internal Holders: MGIVR 3125-4 / 4032-4
Machinist Tip: When to choose MRMN400-M NC3020?
The 4.0mm full radius is a powerful tool, but selecting the right grade is key to profitability:
The Steel Workhorse. Best for dry cutting or high-speed steel turning. It excels in stable setups where tool life consistency is the number one priority.
The Tough All-Rounder. Switch to PC5300 if you encounter interrupted cuts, vibration issues, or need to switch frequently between steel and stainless steel.
Pro Advice: For MRMN400-M NC3020, a higher feed rate often results in better chip breaking. If you see stringy chips at the recommended feed, check your machine's rigidity and try increasing the feed by 10% to "force" the chip into the breaker.
Packaging: 10 pieces per box.
Korloy MRMN400-M price, 4mm full radius insert for steel turning, NC3020 CVD insert for CNC profiling, R2.0 round nose insert for steel, MRMN400-M vs PC5300 profiling
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.