Mitsubishi DCMT070204 AP25N Cermet Turning Insert for Steel Finishing (10pcs)
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DCMT070204 AP25N
High-Speed Cermet | Gloss Finish Specialist | 55° Diamond Geometry
The AP25N Cermet Advantage
AP25N Grade (Advanced Cermet): Mitsubishi's AP25N is a titanium-based cermet grade designed for general-purpose steel finishing. It offers exceptional resistance to oxidation and thermal deformation. Because it does not contain tungsten carbide, it has a near-zero chemical affinity for steel, resulting in zero surface tearing and a reflective "chrome-like" finish on your parts.
Standard Finishing Chipbreaker: This DCMT geometry features a sharp cutting edge and a positive rake angle. It is optimized for light depths of cut, ensuring that chips are broken and evacuated efficiently to prevent scratching the finished surface.
0.4mm Precision Radius: The "04" radius is the universal standard for precision. It minimizes radial cutting forces, which reduces vibration in small-diameter boring or thin-walled turning, while maintaining edge toughness for high-speed runs.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | DCMT070204 | 6.35 mm | 2.38 mm | 0.40 mm |
| Imperial | DCMT21.51 | 1/4" | 3/32" | 0.0157" (1/64") |
Recommended Machining Parameters
*Cermet thrives at high RPMs. Avoid low-speed machining to prevent edge buildup.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Low Carbon Steel | 150 - 350 m/min | 0.05 - 0.20 mm/r | 0.20 - 1.50 mm |
| Alloy Steel (SCM440) | 120 - 280 m/min | 0.05 - 0.15 mm/r | 0.20 - 1.20 mm |
Compatible Tool Holders
Maximum finish quality when used with SDJCR or SDUCR 07 holders:
Shop 07 Series HoldersPro-Tip: AP25N vs. Carbide Grades
AP25N (Cermet): The "Finishing Master." Use this grade for high-gloss, reflective finishes on steel. It is brittle compared to carbide—do not use for interrupted cuts.
US735/VP15TF (Carbide): Use these for stainless steel or when you have "bumps" or "holes" in your cut. Carbide has the toughness that Cermet lacks.
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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.