Mitsubishi CNMG120408-GK MC5005 High-Speed Cast Iron Insert (10pcs)
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CNMG120408-GK MC5005
High-Velocity Specialist | MC5005 Ultra-Hard CVD | GK Robust Stability
Engineered for Maximum Throughput in Cast Iron
MC5005 Grade (The Wear Resistance King): The MC5005 is Mitsubishi's flagship grade for high-speed K-Class (Cast Iron) machining. It features an extra-thick, nano-textured Al2O3 coating on a specialized substrate with superior hardness. This combination provides unprecedented resistance to abrasive wear and plastic deformation, making it possible to run at surface speeds that would melt standard inserts.
GK Chipbreaker (The Stability Edge): The GK geometry is the primary choice for stable cast iron cutting. Because cast iron produces short, brittle chips, the GK breaker focuses on Edge Integrity. The reinforced land prevents micro-chipping when cutting through the "black skin" (scale) of raw castings or dealing with abrasive inclusions.
0.8mm (1/32") Performance Radius: The 08 radius provides the thermal mass needed to withstand high-speed heat generation while ensuring the cutting edge remains robust during medium-to-heavy semi-roughing passes.
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") |
High-Speed Cutting Parameters
*MC5005 excels in dry machining. For Gray Iron, dry cutting is recommended to prevent thermal cracking at high speeds.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Gray Cast Iron (FC300) | 350 - 800 m/min | 0.15 - 0.45 mm/r | 1.00 - 5.00 mm |
| Ductile Iron (FCD600) | 200 - 450 m/min | 0.15 - 0.40 mm/r | 0.80 - 4.00 mm |
Compatible Holder Systems
Maximum clamping force is required for high-speed cast iron cycles. Fits DCLNR/L 12 and DWLNR/L 12 holders:
Shop DCLNR 12 HoldersPro-Tip: MC5005 vs. MC5015
MC5005 (The Speed Demon): Choose this for Gray Cast Iron in highly stable, continuous cutting environments. It prioritizes extreme wear resistance.
MC5015 (The Stable Workhorse): Switch to MC5015 if you are facing interrupted cuts, vibration, or unstable workpiece clamping, as it provides higher fracture toughness.
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