Mitsubishi CNMG120408-MM MC7025 Stainless Steel Turning Insert (10pcs)
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CNMG120408-MM MC7025
Medium-Cut Specialist | MC7025 Anti-Heat CVD | MM Edge Strength
Optimized for Tough Stainless Applications
MC7025 Grade (CVD Nano-Texture): Stainless steel turning generates concentrated heat at the cutting edge. The MC7025 grade utilizes a specialized Al2O3 nano-textured CVD coating that provides an ultra-smooth surface to prevent Built-Up Edge (BUE). This grade is engineered to resist chemical wear and notch wear, extending tool life significantly in Austenitic (300 series) and Duplex stainless steels.
MM Chipbreaker (Medium-Cut Geometry): The MM chipbreaker is the bridge between finishing and roughing. It features a medium-width land that provides the necessary edge toughness to handle variations in depth of cut while maintaining a sharp enough rake angle to prevent work-hardening of the stainless workpiece.
0.8mm (1/32") Performance Radius: The 08 radius is the global standard for medium turning. It offers excellent structural integrity for semi-roughing while providing a high-quality surface finish for final passes.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMG120408-MM | 12.7 mm | 4.76 mm | 0.80 mm |
| Imperial | CNMG432-MM | 1/2" | 3/16" | 0.0315" (1/32") |
Recommended Cutting Parameters
*Stainless steel requires constant chip load. Avoid rubbing; maintain the recommended feed rate for best results.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Austenitic (304/316) | 120 - 210 m/min | 0.15 - 0.35 mm/r | 1.00 - 4.00 mm |
| Duplex Stainless Steel | 70 - 140 m/min | 0.12 - 0.25 mm/r | 0.80 - 3.00 mm |
Compatible Tool Holders
Ensure absolute rigidity for M-Class turning with DCLNR/L 12 series holders:
Shop DCLNR 12 HoldersPro-Tip: MC7025 vs. MP7035
MC7025 (Productivity First): A CVD grade designed for high-speed continuous cutting. It is the best choice for mass production where speed is prioritized.
MP7035 (Toughness First): A PVD grade. Switch to MP7035 for heavy interrupted cuts or when the machine spindle speed is low, causing edge chipping on CVD grades.
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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.