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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