Mitsubishi CNMG120408-GM MC7025 Stainless Steel Turning Insert (10pcs)
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CNMG120408-GM MC7025
Stainless Steel Workhorse | MC7025 Heat Resistance | GM Balanced Geometry
Optimized for Tough & Sticky Materials
MC7025 Grade (CVD Stainless Specialist): The MC7025 is Mitsubishi's premier CVD-coated grade for M-Class (Stainless Steel). It features a specialized coating layer designed to prevent "galling" and built-up edge. Its high resistance to thermal cracking makes it ideal for the high-temperature environment of stainless turning, ensuring the cutting edge stays sharp longer than general-purpose grades.
GM Chipbreaker (General Medium-Range): The GM geometry is a versatile "all-rounder." It is engineered to control chips across a wide variety of feed rates and depths of cut. In stainless steel, where chip control is notoriously difficult, the GM design breaks chips into manageable "6-shapes," preventing bird-nesting and workpiece damage.
0.8mm (1/32") Universal Radius: The 08 radius provides a robust cutting edge. It offers a superior balance of strength and surface finish, making it the standard choice for semi-finishing to light roughing operations in industrial manufacturing.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMG120408-GM | 12.7 mm | 4.76 mm | 0.80 mm |
| Imperial | CNMG432-GM | 1/2" | 3/16" | 0.0315" (1/32") |
Stainless Cutting Parameters
*The 0.8mm radius allows for higher feed rates. Use high-pressure coolant to prolong tool life in austenitic stainless steels.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Austenitic (304 / 316) | 120 - 220 m/min | 0.15 - 0.40 mm/r | 1.00 - 4.00 mm |
| Martensitic (410 / 440C) | 140 - 260 m/min | 0.12 - 0.35 mm/r | 0.80 - 3.50 mm |
Compatible Tool Holders
Maximum clamping rigidity is required for stainless turning. Fits DCLNR/L 12 series holders:
Shop DCLNR 12 HoldersPro-Tip: MC7025 vs. MP7035
MC7025 (The Productivity Choice): A CVD grade designed for high-speed, continuous cuts where heat resistance is critical.
MP7035 (The Tough Choice): A PVD grade. Switch to MP7035 if you are facing heavy interrupted cuts or low cutting speeds that cause edge chipping.
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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.