Mitsubishi CNMA120412 UC5115 Flat-Top Carbide Insert for Cast Iron (10pcs)
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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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