Mitsubishi CNMG120404-FH AP25N Cermet Finishing Insert (10pcs)
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CNMG120404-FH AP25N
High-Precision Finishing | AP25N Cermet Technology | 0.4mm Precision Tip
The Ultimate Surface Finish Specialist
AP25N Cermet Grade (Chemical Stability): AP25N is a Cermet grade (Ceramic + Metal) that provides the high hardness of ceramics with the toughness of metal. Because it has low affinity for steel, it effectively prevents Built-up Edge (BUE). This allows for higher cutting speeds and results in a shiny, high-precision surface finish often required for final tolerances.
FH Chipbreaker (Fine Finish Geometry): The FH chipbreaker is specifically engineered for light depths of cut. It features a sharp cutting edge and a specialized chip pocket that forces the chip to curl and break even at very low feed rates, preventing the "bird-nesting" that typically ruins a finished surface.
0.4mm (1/64") Precision Radius: The 04 radius is the ideal choice for finishing. It minimizes radial cutting forces, which reduces tool deflection and vibration—crucial for maintaining dimensional accuracy on slender workpieces.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMG120404-FH | 12.7 mm | 4.76 mm | 0.40 mm |
| Imperial | CNMG431-FH | 1/2" | 3/16" | 0.0157" (1/64") |
Recommended Finishing Parameters
*AP25N Cermet excels at high speeds. Use higher speeds to improve surface gloss. Avoid heavy interrupted cuts.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Carbon/Alloy Steel | 150 - 350 m/min | 0.05 - 0.20 mm/r | 0.10 - 1.00 mm |
| Stainless Steel (400 series) | 120 - 250 m/min | 0.05 - 0.15 mm/r | 0.10 - 0.80 mm |
Compatible Tool Holders
Use DCLNR/L 12 series holders for stable finishing passes:
Shop DCLNR 12 HoldersPro-Tip: Cermet AP25N vs. Carbide VP15TF
AP25N (High Gloss): Use this when surface finish is your top priority. It provides a mirror finish and maintains dimensional accuracy over long runs.
VP15TF (Toughness): Switch back to VP15TF if you are experiencing edge chipping or need to do roughing/interrupted cuts, as cermet is more brittle than carbide.
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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.