Mitsubishi CNMG120404-GK MC5015 Cast Iron Turning Insert (10pcs)
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CNMG120404-GK MC5015
Cast Iron Specialist | MC5015 Abrasive Resistance | GK Robust Geometry
Optimized for Abrasive Cast Iron Environments
MC5015 Grade (The Wear Barrier): The MC5015 is Mitsubishi's premium CVD grade for K-Class (Cast Iron). Cast iron is notoriously abrasive; this grade combats that with a specialized thick alumina ($Al_2O_3$) coating that provides industry-leading flank wear resistance. This allows for significantly higher cutting speeds and longer tool life when machining Gray and Ductile iron components.
GK Chipbreaker (Stability Finishing): The GK geometry is a "Stable Cutting" breaker. Unlike finishing breakers for steel, the GK features a reinforced cutting edge land. This is crucial for cast iron, as it prevents the edge from chipping when it hits small pores or sand inclusions common in castings.
0.4mm (1/64") Precision Radius: The small 04 radius is designed to reduce tool pressure. This is particularly effective for finishing passes on thin-walled cast iron parts where vibration and "break-out" at the end of the cut must be minimized.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMG120404-GK | 12.7 mm | 4.76 mm | 0.40 mm |
| Imperial | CNMG431-GK | 1/2" | 3/16" | 0.0157" (1/64") |
Cast Iron Cutting Parameters
*MC5015 can be run dry in most cast iron applications. For Ductile iron, coolant can help control heat.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Gray Cast Iron (FC250) | 250 - 550 m/min | 0.10 - 0.35 mm/r | 0.50 - 3.50 mm |
| Ductile Iron (FCD450) | 180 - 350 m/min | 0.10 - 0.30 mm/r | 0.50 - 2.50 mm |
Compatible Tool Holders
Standardize your setup with DCLNR/L 12 series holders for maximum rigidity:
Shop DCLNR 12 HoldersPro-Tip: MC5015 vs. MC5005
MC5015 (The Versatile Choice): Excellent for high-speed Gray iron and stable Ductile iron machining. It offers the best balance of wear resistance and toughness.
MC5005 (The High-Velocity Specialist): Switch to MC5005 for absolute maximum surface speeds in Gray iron where cutting conditions are extremely stable and continuous.
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