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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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.