High-Speed Stainless Steel Machining Expert | 100% Made in Japan
Product Overview
The Mitsubishi WNMG080408-MS US7020 is a premium, double-sided 80° trigon negative insert designed for high-efficiency stainless steel turning. Engineered for stable CNC machining at higher cutting speeds, the US7020 CVD coating provides industry-leading wear resistance and thermal stability. Featuring a versatile 0.8mm corner radius and the MS chipbreaker, this indexable carbide insert is your best solution for achieving superior surface finishes and extended tool life when machining austenitic and martensitic 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
MS Finishing
Technical Specifications: Metric vs. Imperial
Technical Feature
Metric (ISO)
Imperial (ANSI)
Model Number
WNMG 080408-MS
WNMG 432-MS
Inscribed Circle (IC)
12.7 mm
0.500 inch
Corner Radius
0.8 mm
0.031 inch
Advanced Grade: US7020 (High-Speed Cutting)
The US7020 grade is Mitsubishi's specialized CVD solution for high-speed stainless steel machining. It features an Al2O3+TiN coating that offers superior heat resistance, preventing thermal deformation of the cutting edge even during continuous high-speed runs. This grade is specifically designed to handle the abrasive nature of stainless while ensuring high-productivity tool life in stable conditions.
MS Chipbreaker Geometry
The MS (Medium-Sharp) chipbreaker is designed for finishing to light-medium cutting. For stainless steel, the MS geometry is critical for preventing "built-up edge" (BUE) and managing chip control in gummier materials. The sharp edge reduces cutting resistance, ensuring high-precision dimensions and an exceptional surface finish on your CNC lathe.
⭐⭐⭐⭐⭐ "High Speed Reliability" - Tom J., USA "Switched to US7020 for a high-volume stainless run. I was able to increase my SFM by 20% compared to my old grade without losing tool life."
⭐⭐⭐⭐⭐ "Mirror Finish" - Stefan K., Germany "The MS chipbreaker is perfect for our 316 parts. Very low friction and the surface finish is top-tier. Authentic Mitsubishi quality."
⭐⭐⭐⭐ "Great Chip Control" - Kenji Y., Japan "Consistent chip breaking even at lower depths of cut. Reduces downtime for chip clearing significantly."
⭐⭐⭐⭐⭐ "Economic & Strong" - Andrew L., Australia "6 usable edges with WNMG and the toughness of US7020 is a winner for our job shop. Excellent price."
⭐⭐⭐⭐⭐ "Original Quality" - Marek P., Poland "Always trust Japanese made inserts for our CNC production. Reliable tool life and fast shipping."
Technical Q&A
Q: When should I choose US7020 over US735?
A: Choose US7020 for stable, high-speed cutting. Choose US735 if you have unstable setups, interrupted cuts, or need extra toughness.
Q: Is this insert suitable for roughing?
A: The MS breaker is optimized for finishing to light-medium work. For heavy roughing, we recommend the MA or RM chipbreaker.
Q: How many cutting edges does it have?
A: WNMG is a double-sided trigon insert, giving you 6 usable edges per insert, making it very cost-effective.
Expert Machining Tip: Speed vs. Toughness
For High-Speed Production in stainless, US7020 is your top choice. If your priority is toughness against edge chipping in difficult materials, US735 is the better alternative.
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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