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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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.