Korloy MRMN500-M NC3120 5mm Full Radius R2.5 Steel & Cast Iron Insert (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
The Original Korloy MRMN500-M NC3120 is a heavy-duty 5.0mm Full Radius (R2.0) Profiling Insert, precision-engineered for the versatile machining of both Steel (P) and Cast Iron (K). Featuring the advanced NC3120 CVD coating, this insert excels in heavy-load environments where stability and wear resistance are equally critical. The Full Radius (Round Nose) geometry, paired with the -M (Medium) chipbreaker, allows for aggressive material removal and smooth 3D contouring on large-diameter workpieces.
The Multi-Material Master: NC3120 is designed to handle the varied thermal and mechanical stresses of steel and ductile iron. Its optimized multi-layer CVD coating resists peeling and micro-chipping, making it the most reliable choice for general engineering shops.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MRMN500-M |
| Insert Shape | Full Radius (Round Nose) |
| Width / Radius | 5.0 mm / R2.5 |
| Grade | NC3120 (Steel & Cast Iron Optimized) |
Core Performance Benefits:
- Steel & Cast Iron Dual Purpose: Eliminate the need for frequent insert changes when switching between alloy steel and grey/ductile iron.
- R2.5 High-Strength Tip: The 5mm full radius provides a robust cutting edge for heavy profiling and large circular groove applications.
- Advanced CVD Heat Barrier: Maintains cutting edge hardness even at high surface speeds, extending tool life significantly over PVD grades.
- Stabilized -M Chipbreaker: Optimized for medium to heavy chip loads, ensuring clear chip evacuation and preventing workpiece marring.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Carbon Steel (S45C) | 130 - 220 m/min | 0.12 - 0.28 mm/rev |
| Alloy Steel (42CrMo) | 100 - 180 m/min | 0.10 - 0.22 mm/rev |
| Ductile Iron (FCD) | 110 - 200 m/min | 0.15 - 0.30 mm/rev |
Compatible Tool Holders:
Precision 5.0mm seat fit for heavy-duty holder systems:
- External Holders: MGEHR 2525-5 / 3232-5 / 4040-5
- Internal Holders: MGIVR 3125-5 / 4032-5
Machinist Tip: Why choose NC3120 for 5.0mm Cuts?
At a 5.0mm width, the cutting force and heat are substantial. Here is how NC3120 compares:
The Generalist. Use this for consistent performance across both steel and cast iron. It is tougher and more reliable in varied shop conditions than NC3020.
The Speed Specialist. Best only for continuous, ultra-stable steel turning at high speeds. Not recommended for cast iron due to potential micro-chipping.
Pro Advice: For MRMN500-M NC3120, the R2.5 radius is quite large. Always ensure your machine has sufficient torque at lower RPMs when machining large diameters to maintain the recommended cutting speed (Vc).
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.