Mitsubishi CNMA120412 UC5115 Flat-Top Carbide Insert for Cast Iron (10pcs)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
CNMA120412 UC5115
Aggressive Roughing Specialist | 1.2mm Corner Radius | UC5115 CVD Grade
Built for Maximum Metal Removal
UC5115 Grade (The Versatile Toughness King): UC5115 is a premium CVD-coated grade engineered for the entire spectrum of Cast Iron (K-Class). It utilizes a thick Alumina (Al2O3) coating that acts as a thermal shield, preventing heat from the cutting zone from softening the carbide substrate. This allows for sustained high-speed machining in abrasive materials.
CNMA Flat-Top Geometry: The CNMA series is a non-chipbreaker (flat-top) design. Cast iron produces short, brittle chips that don't need to be curled. By removing the chipbreaker groove, the insert maintains its full structural thickness right up to the edge. This makes the CNMA significantly more resistant to crater wear and edge fracture than standard CNMG inserts when machining iron.
1.2mm (3/64") Heavy-Duty Radius: The larger radius provides the highest level of edge security. It allows for **aggressive feed rates** and deep cuts while effectively dissipating heat away from the corner, extending tool life during heavy roughing of large engine blocks, brake discs, and flywheels.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMA120412 | 12.7 mm | 4.76 mm | 1.20 mm |
| Imperial | CNMA433 | 1/2" | 3/16" | 0.0472" (3/64") |
Heavy Roughing Parameters
*The 1.2mm radius generates higher radial forces. Ensure your machine and workpiece setup are highly rigid.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Gray Cast Iron (Class 40/GG25) | 150 - 450 m/min | 0.25 - 0.60 mm/r | 1.20 - 5.50 mm |
| Ductile Iron (60-40-18/GGG50) | 120 - 350 m/min | 0.20 - 0.45 mm/r | 1.00 - 4.50 mm |
Recommended Tool Holders
Maximum clamping stability for DCLNR/L 12 and MCLNR/L 12 series holders:
Shop DCLNR 12 HoldersPro-Tip: When to choose the 1.2mm Radius
1.2mm Radius: The safest choice for heavy roughing. Use this when your primary goal is high metal removal rates (MRR) or when cutting through heavily interrupted surfaces.
0.8mm Radius: Use for general purpose turning where you need a balance between roughing capability and a better surface finish on the final pass.
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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.