Cast Iron Machining Specialist | High-Speed Performance | Made in Japan
Product Overview
The Mitsubishi WNMG080404-GK MC5015 is a high-performance, double-sided 80° trigon negative insert specifically engineered for the unique challenges of cast iron turning. Utilizing the advanced MC5015 CVD coating technology, this insert provides industry-leading wear resistance against abrasive materials like gray and ductile iron. Combined with the robust GK chipbreaker and a precise 0.4mm corner radius, this indexable carbide insert ensures stable CNC machining and extended tool life in high-speed applications.
ISO Designation Identification
W Trigon 80°
N Negative 0°
M Tolerance
G Hole/Chip
08 IC 12.7mm
04 Thick 4.76mm
04 Radius 0.4mm
GK Stable Cutting
Technical Specifications: Metric vs. Imperial
Technical Feature
Metric (ISO)
Imperial (ANSI)
Model Number
WNMG 080404-GK
WNMG 431-GK
Inscribed Circle (IC)
12.7 mm
0.500 inch
Corner Radius
0.4 mm
0.016 inch
Advanced Grade: MC5015 (Cast Iron Excellence)
The MC5015 grade is Mitsubishi's premier CVD solution for high-speed cast iron machining. It features an extra-thick Al2O3 (Alumina) layer which provides incredible thermal barrier protection and abrasion resistance. This grade is specifically designed to combat the "sand" and abrasive particulates found in cast iron, resulting in significantly more consistent tool life compared to general-purpose grades.
GK Chipbreaker Geometry
The GK chipbreaker is optimized for stable cutting and high edge reliability. Cast iron often produces short, brittle chips, but the GK geometry focuses on preventing edge chipping and managing heat dissipation. The 0.4mm (04) corner radius is perfect for precision machining where a high degree of dimensional accuracy and lower cutting forces are needed.
⭐⭐⭐⭐⭐ "Outstanding Wear Resistance" - Mark T., USA "Switched to MC5015 for our ductile iron brake rotors. We're getting 40% more parts per edge than our previous supplier. Highly recommend."
⭐⭐⭐⭐⭐ "Perfect for High Speed" - Lars H., Germany "We run these at 400 m/min on gray iron. The finish is consistent and the insert doesn't burn out. Original quality."
⭐⭐⭐⭐ "Very Stable" - Kenji S., Japan "The GK breaker is very reliable. No sudden chipping even when the casting surface is rough. Very good for production."
⭐⭐⭐⭐⭐ "Great Finish on Castings" - Liam F., Australia "The 0.4mm radius gives us the precision we need for finishing passes. MC5015 is a beast in iron. 6 edges per insert is amazing."
⭐⭐⭐⭐⭐ "Fast Shipping" - Pavel D., Poland "Arrived quickly and in original Mitsubishi packaging. Consistent performance every box. Five stars."
Technical Q&A
Q: Can I use MC5015 for Steel?
A: MC5015 is specialized for Cast Iron (K-Class). For steel, we recommend MC6025 or UE6110 for better results.
Q: Is the 0.4mm radius good for roughing?
A: The 0.4mm (04) radius is best for finishing to light-medium work. For heavy roughing, a 0.8mm or 1.2mm radius is typically preferred.
Q: Why is WNMG better than CNMG?
A: Both are 80° trigon/diamond, but WNMG offers 6 usable edges compared to 4 on CNMG, providing 50% more value per insert.
Expert Machining Tip: MC5015 vs MC5005
For High-Speed General Cast Iron machining, MC5015 is your best choice. If you are specifically focused on Continuous High-Speed Cutting of Gray Iron, consider MC5005 for even higher wear resistance.
Mitsubishi WNMG080404-GK MC5015 Cast Iron Turning Inserts (10pcs/box)
$92.26
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