Mitsubishi CNMA120404 UC5115 Flat-Top Carbide Insert for Cast Iron (10pcs)
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CNMA120404 UC5115
General Purpose Cast Iron Specialist | Flat-Top Design | 0.4mm Radius
The Balance of Power and Precision
UC5115 Grade (CVD Coating): The UC5115 is Mitsubishi’s most popular grade for **K-Class (Cast Iron)** materials. It features a thick Alumina layer for heat resistance and a specialized TiCN layer for toughness. It is designed to handle the transition between **Gray Iron** and the more difficult **Ductile (Nodular) Iron**, where impact resistance is just as important as wear resistance.
CNMA Flat-Top Geometry: The CNMA designation indicates a "Non-Chipbreaker" insert. In cast iron machining, chips break into small segments naturally. By utilizing a flat top, the cutting edge is much thicker and more robust than a CCMT or CNMG insert. This prevents the edge from crumbling when it hits hard sand pockets or surface scale on raw castings.
0.4mm (1/64") Precision Corner: The small radius is ideal for Finishing and semi-finishing. It minimizes the radial force, which prevents workpiece deflection and chatter, especially on long-reach boring operations or thin-walled cast components.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMA120404 | 12.7 mm | 4.76 mm | 0.40 mm |
| Imperial | CNMA431 | 1/2" | 3/16" | 0.0157" (1/64") |
Recommended Cutting Parameters
*UC5115 is highly stable. For the best surface finish with a 0.4mm radius, maintain the lower end of the feed range.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Gray Cast Iron (HT250) | 150 - 450 m/min | 0.10 - 0.30 mm/r | 0.50 - 4.50 mm |
| Ductile Iron (QT500) | 120 - 300 m/min | 0.10 - 0.25 mm/r | 0.50 - 3.50 mm |
Compatible Tool Holders
Maximum clamping force for DCLNR/L 12 and MCLNR/L 12 series holders:
Shop DCLNR 12 HoldersPro-Tip: Choosing between CNMA and CNMG
CNMA (Flat Top): Specifically for Cast Iron. The lack of a chipbreaker creates a stronger edge that resists the abrasive nature of graphite.
CNMG (With Chipbreaker): Only for Steel or Stainless Steel where long, dangerous chips need to be curled. Using a CNMG on cast iron usually leads to premature edge wear.
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