Mitsubishi DCMT11T304 AP25N Cermet Turning Insert for Mirror Finish (10pcs)
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DCMT11T304 AP25N
Steel Finishing Master | AP25N Cermet Grade | 55° Precision Diamond
Cermet Technology for High-Gloss Surfaces
AP25N Grade (Uncoated Cermet): The AP25N is a titanium-based cermet grade designed for general finishing of carbon and alloy steels. Cermet's unique property is its resistance to heat-induced welding. This ensures the cutting edge remains "clean," allowing for higher cutting speeds and resulting in a glossy, burnished surface finish that often eliminates the need for secondary grinding.
DCMT Geometry (Positive Rake): The 55-degree diamond shape with a 7-degree relief angle provides the clearance needed for intricate profiling. The positive chipbreaker geometry is optimized for light finishing depths, ensuring consistent chip control and preventing surface marring.
0.4mm Precision Radius: The "04" (1/64") radius is the gold standard for high-precision finishing. It minimizes radial cutting pressure, preventing vibration and chatter in slender workpieces or internal boring applications.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | DCMT11T304 | 9.525 mm | 3.97 mm | 0.40 mm |
| Imperial | DCMT32.51 | 3/8" | 5/32" | 0.0157" (1/64") |
Recommended Cutting Parameters
*Cermet performs best at high surface speeds (Vc). Ensure consistent cutting conditions for maximum tool life.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Carbon/Mild Steel | 150 - 380 m/min | 0.05 - 0.20 mm/r | 0.20 - 1.50 mm |
| Alloy Steel (4140/SCM440) | 120 - 280 m/min | 0.05 - 0.15 mm/r | 0.20 - 1.20 mm |
Compatible Tool Holders
Maximum stability for high-speed finishing with SDJCR/L or SDUCR/L 11-series holders:
Shop SDJCR 11 HoldersCermet Tip: AP25N vs. Carbide Grade
AP25N (Cermet): Specifically for "Mirror" finishing. Best for high surface speeds in continuous cuts. It is more brittle than carbide, so avoid interrupted cuts or heavy shocks.
US735 (Tough Carbide): The choice for Stainless Steel and interrupted cuts. Carbide offers the toughness needed for impact, whereas Cermet offers the chemical stability for superior finish on steel.
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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.