Korloy MRMN200-M NC3120 2mm Full Radius R1.0 CVD Steel & Cast Iron Insert (10pcs)
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The Original Korloy MRMN200-M NC3120 is a versatile 2.0mm Full Radius (R1.0) Profiling Insert specifically designed for high-stability Steel (P) and Cast Iron (K) machining. Featuring the advanced NC3120 CVD coating, this insert bridges the gap between high-speed wear resistance and impact toughness. The Full Radius (Round Nose) geometry and -M (Medium) chipbreaker provide excellent surface finishes and reliable chip management during intricate 3D contouring on CNC lathes.
The Versatile Performer: NC3120 is engineered with a specialized CVD layer that excels in both general steel turning and abrasive cast iron applications. It offers better toughness than NC3020, making it more resistant to micro-chipping in varied production environments.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MRMN200-M |
| Insert Shape | Full Radius (Round Nose) |
| Width / Radius | 2.0 mm / R1.0 |
| Grade | NC3120 (Steel & Cast Iron CVD) |
Core Performance Benefits:
- Multi-Material Application: Optimized for Carbon Steel, Alloy Steel, and Grey/Ductile Cast Iron.
- R1.0 Precision Profile: Ideal for half-round grooves and smooth, seamless transitions in 3D profiling.
- High-Toughness CVD: The NC3120 grade provides excellent resistance to edge buildup and thermal cracking.
- Consistent Surface Finish: The -M chipbreaker maintains stable cutting forces, resulting in high-quality mirror-like finishes on shafts.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Mild Steel (1018/S20C) | 140 - 240 m/min | 0.05 - 0.15 mm/rev |
| Alloy Steel (4140/42CrMo) | 110 - 200 m/min | 0.04 - 0.12 mm/rev |
| Ductile Cast Iron (FCD) | 120 - 220 m/min | 0.06 - 0.18 mm/rev |
Compatible Tool Holders:
Precision 2.0mm seat fit for standard holder systems:
- External Holders: MGEHR 1212-2 / 1616-2 / 2020-2
- Internal Holders: MGIVR 2016-2 / 2520-2
Machinist Tip: Why choose NC3120 over NC3020?
Understanding the versatility of the NC3120 grade:
The "Balanced" Choice. If you switch between machining steel and cast iron frequently, or if your steel setup has minor vibrations, NC3120's added toughness prevents the edge from chipping prematurely.
The "High Speed" Choice. Only recommended for continuous, ultra-stable steel turning where maximum wear resistance is the only requirement. Less effective on cast iron than NC3120.
Pro Advice: For MRMN200-M NC3120, the 2.0mm width is thin. Always ensure your tool holder is clean and the clamping screw is torqued correctly to prevent micro-vibrations that could lead to "chatter" marks on your radius.
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.