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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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.