Mitsubishi CNMG120408-GK MC5015 Cast Iron Turning Insert (10pcs)
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CNMG120408-GK MC5015
Cast Iron Powerhouse | MC5015 Wear Resistance | GK Stable Geometry
Optimized for Heavy-Duty Cast Iron Turning
MC5015 Grade (Nano-Layer CVD): The MC5015 is Mitsubishi's premium solution for K-Class (Cast Iron) materials. It features an ultra-thick alumina ($Al_2O_3$) coating that acts as a thermal and abrasive shield. This grade is specifically engineered to resist flank wear caused by the high graphite content in Gray Iron and the toughness of Ductile (Nodular) Iron.
GK Chipbreaker (Cast Iron Stability): The GK geometry is designed for medium-to-roughing stability. Unlike steel chipbreakers that focus on "breaking" long chips, the GK focus is on Edge Protection. It features a wide, flat land that prevents the edge from micro-chipping when encountering the uneven surface or sand inclusions typical in cast parts.
0.8mm (1/32") Robust Radius: The 08 radius is the global standard for stability. It provides a larger contact area to dissipate heat, making it much more durable than 04 radii when machining high-strength ductile irons at high surface speeds.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMG120408-GK | 12.7 mm | 4.76 mm | 0.80 mm |
| Imperial | CNMG432-GK | 1/2" | 3/16" | 0.0315" (1/32") |
Cast Iron Cutting Parameters
*MC5015 can be run dry in Gray Iron for better tool life. Use coolant in Ductile Iron to prevent heat build-up.
| Material Type | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Gray Cast Iron (G250/FC250) | 250 - 500 m/min | 0.15 - 0.45 mm/r | 1.00 - 4.50 mm |
| Ductile Iron (65-45-12) | 150 - 320 m/min | 0.15 - 0.40 mm/r | 0.80 - 3.50 mm |
Compatible Tool Holders
Maximum rigidity is essential for cast iron machining. Fits DCLNR/L 12 and PCLNR/L 12 holders:
Shop DCLNR 12 HoldersPro-Tip: MC5015 vs. MC5005
MC5015 (The All-Rounder): The standard choice for cast iron. Best for parts with skin, scale, or light interruptions.
MC5005 (The High-Velocity Expert): Only switch to MC5005 if you are machining Gray Cast Iron at ultra-high speeds in a perfectly rigid environment to achieve maximum throughput.
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