Korloy MRMN500-M NC3120 5mm Full Radius R2.5 Steel & Cast Iron Insert (10pcs)
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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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