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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