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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This Mitsubishi insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.