Professional Stainless Steel Specialist | MM Medium Chipbreaker | Made in Japan
Product Overview
The Mitsubishi WNMG080408-MM MC7025 is a high-performance double-sided 80° trigon negative insert precision-engineered for Stainless Steel turning. Featuring the revolutionary MC7025 CVD coating, this insert provides superior heat resistance and prevents built-up edge (BUE) which is common in austenitic stainless steels. The MM chipbreaker is the gold standard for medium cutting, making this indexable carbide insert the top choice for CNC machining shops requiring high reliability and exceptional surface finishes on 304, 316, and duplex stainless steels.
ISO Designation Identification
W Trigon 80°
N Negative 0°
M Tolerance
G Hole/Chip
08 IC 12.7mm
04 Thick 4.76mm
08 Radius 0.8mm
MM Med. Stainless
Technical Specifications: Metric vs. Imperial
Technical Feature
Metric (ISO)
Imperial (ANSI)
Model Number
WNMG 080408-MM
WNMG 432-MM
Inscribed Circle (IC)
12.7 mm
0.500 inch
Corner Radius
0.8 mm
0.031 inch
Advanced Grade: MC7025 (The Stainless Expert)
The MC7025 grade uses a specialized CVD coating designed for the unique challenges of machining stainless steel. Its smooth surface reduces friction, which drastically lowers the heat generated at the cutting tip. This prevents the stainless steel from hardening or sticking to the insert, resulting in a longer tool life and stable precision machining even in high-speed applications.
MM Chipbreaker Geometry
The MM (Medium) chipbreaker is specifically optimized for stainless steel. It features a unique groove shape that handles the high elasticity of stainless steel, forcing chips to break efficiently. In the CNC turning process, this geometry provides a perfect balance between cutting edge sharpness and toughness, ideal for general-purpose medium cutting.
⭐⭐⭐⭐⭐ "Stainless Steel Solution" - Sarah J., USA "We were struggling with built-up edge on 316 stainless. Switched to MC7025 and the finish is night and day. Highly recommend."
⭐⭐⭐⭐⭐ "Predictable Wear" - Guillaume L., France "Very reliable grade. The MM breaker handles the long chips of 304 stainless perfectly. Original Japanese quality."
⭐⭐⭐⭐ "Great Consistency" - Kenji O., Japan "Consistently high quality. MC7025 is our standard for all stainless turning jobs in the CNC shop."
⭐⭐⭐⭐⭐ "6 Edges is the Best" - David B., UK "The trigon shape gives us more edges than CNMG. Great value for high-volume stainless production."
⭐⭐⭐⭐⭐ "Quick Delivery" - Andres V., Spain "Received authentic Mitsubishi boxes. These inserts perform exactly as expected in tough duplex steels."
Technical Q&A
Q: Is MC7025 suitable for Alloy Steel?
A: MC7025 is optimized for Stainless Steel (M-Class). For general steel turning, UE6110 or MC6025 is recommended for better cost-efficiency.
Q: What is the benefit of the MM chipbreaker?
A: The MM breaker is designed to efficiently break the tough, stringy chips characteristic of stainless steel, ensuring a smooth CNC machining process.
Q: How many cutting edges are on this insert?
A: WNMG is a double-sided trigon, providing a total of 6 usable cutting edges, making it significantly more economical than CNMG.
Expert Machining Tip: MC7025 vs US735
For Stable High-Speed Stainless turning, MC7025 is superior. If you are doing Heavy Interrupted Cuts or working at low speeds, consider the US735 PVD grade for higher toughness.
Looking for a BEYOND equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
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