Korloy MRMN400-M NC3030 4mm Full Radius R2.0 Tough 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 NC3030 is a heavy-duty 4.0mm Full Radius (R2.0) Profiling Insert specifically engineered for Steel (P) machining where reliability is the top priority. Featuring the high-toughness NC3030 CVD coating, this insert is the premier choice for interrupted cuts, forged surfaces, and machining on older, less rigid CNC lathes. The Full Radius (Round Nose) geometry, combined with the -M (Medium) chipbreaker, provides maximum edge security and excellent chip evacuation during deep contouring of carbon and alloy steels.
The Toughness Champion: NC3030 is designed to prevent sudden brittle failure. If you are struggling with edge chipping on 4mm grooves or profiles due to surface scale or machine vibration, the NC3030's shock-absorbing substrate is your ultimate solution.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MRMN400-M |
| Insert Shape | Full Radius (Round Nose) |
| Width / Radius | 4.0 mm / R2.0 |
| Grade | NC3030 (High-Toughness Steel CVD) |
Core Performance Benefits:
- Maximum Edge Toughness: Specialized CVD layer resists thermal shock and mechanical impact during interrupted cuts.
- Large R2.0 Full Radius: Perfect for deep, rounded channels and heavy-duty 3D profiling on large-diameter steel shafts.
- Structural Rigidity: The 4.0mm width allows for high lateral feed rates without tool deflection.
- Advanced -M Chip Control: Designed to handle medium to heavy chips, preventing "bird-nesting" in carbon steel applications.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Carbon Steel (1045 / S45C) | 110 - 190 m/min | 0.10 - 0.22 mm/rev |
| Alloy Steel (4140 / 42CrMo) | 90 - 160 m/min | 0.08 - 0.18 mm/rev |
| Heavy Forgings / Scale | 70 - 120 m/min | 0.06 - 0.15 mm/rev |
Compatible Tool Holders:
Precision 4.0mm seat fit for heavy-duty systems:
- External Holders: MGEHR 2525-4 / 3232-4 / 4040-4
- Internal Holders: MGIVR 3125-4 / 4032-4
Machinist Tip: Why choose MRMN400-M NC3030?
When grooving or profiling at 4.0mm width, the choice between NC3020 and NC3030 is critical:
The "Safe" Choice. Perfect for general workshop use where you don't always have a perfect setup. It's much better at handling the shocks of interrupted cuts and varied steel hardness.
The "Fast" Choice. Best for high-speed, continuous turning in clean steel mass production. More wear-resistant but more prone to chipping if things get bumpy.
Pro Advice: For MRMN400-M NC3030, if you encounter heavy vibration on a large shaft, try using a slightly larger tool holder shank (like 3232-4) to provide the rigid foundation this heavy-duty insert deserves.
Packaging: 10 pieces per box.
Korloy MRMN400-M price, 4mm full radius insert for alloy steel, R2.0 round nose insert for interrupted cut, NC3030 vs NC3020 profiling, MRMN400-M cutting parameters steel
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.