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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This Mitsubishi insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.