TUNGALOY CNMG120408HMM AH905 80° Diamond Carbide Insert for Heat-Resistant Superalloy Turning with HMM Chipbreaker

CNMG120408 HMM AH905 Tungaloy Solid Carbide Insert 12.7mm IC for Aerospace Inconel CNC Turning

The TUNGALOY CNMG120408HMM AH905 is a premium 80° diamond-shaped solid carbide turning insert, purpose-built for CNC turning of heat-resistant superalloys, stainless steel, and high-strength steels. Featuring Tungaloy’s advanced AH905 PVD (Al,Ti)N coating and exclusive HMM chipbreaker, it delivers exceptional wear resistance, high-temperature stability, and reliable chip control in continuous to moderate interrupted cuts. Ideal for aerospace, power generation, and medical component machining, it ensures long, predictable tool life in difficult-to-cut materials.

• 80° Diamond (C-type) Geometry: Rigid 0° relief angle design for heavy-duty turning and interrupted cuts.
• HMM Chipbreaker: Specially engineered for superalloys; large rake angle + unique protrusions reduce cutting force and chip contact area, preventing built-up edge and ensuring smooth evacuation.
• AH905 Grade: Nano-structured (Al,Ti)N PVD coating with PremiumTec surface smoothing technology; superior oxidation resistance (up to 1,000°C), high adhesion, and excellent chipping resistance.
• Precision Cutting Edge: Ground 0.8mm corner radius (R0.8) and sharp edges for high surface finish and dimensional accuracy.
• Double-Sided Usable: Through-hole design enables double-sided use, maximizing cost efficiency.
• Ultra-Fine Carbide Substrate: Balanced hardness and toughness for stable performance in high-stress superalloy turning.

• Heat-resistant superalloys (Inconel 718, Hastelloy, Waspaloy)
• Stainless steel (304, 316, duplex, PH grades)
• High-strength alloy steels (4340, 4140, 300M)
• Pre-hardened steels
• Titanium alloys

• External roughing & semi-finishing turning
• Facing, contouring, and profiling
• Boring and internal turning
• Aerospace engine components (turbine disks, blades)
• Power generation parts (gas turbine components)
• Medical implants and oil & gas valve components

Engineered exclusively for superalloy turning, the AH905 grade with HMM chipbreaker outperforms conventional inserts in tool life (up to 2x longer), wear resistance, and chip control. The PremiumTec surface reduces friction and built-up edge, while the robust substrate resists chipping in interrupted cuts. It minimizes downtime for tool changes and chip removal, making it the top choice for high-productivity, high-precision machining in demanding industries.