CNMG190616-GR NC3020 Carbide Insert - Heavy Duty for Stainless & Alloy Steel

Tackle tough materials with confidence using these robust turning inserts. This listing is for 5 pieces of CNMG190616-GR (CNMG644-GR) indexable inserts featuring Mitsubishi's tough NC3020 grade and specialized GR chipbreaker.

Product Specifications

• Model: CNMG190616-GR / CNMG644-GR
• Shape: 80° Diamond (C), Negative Rake
• Cutting Edge Length: 19.05 mm (3/4 inch)
• Thickness: 6.35 mm (1/4 inch)
• Corner Radius: 1.6 mm (for strong cutting edge)
• Cutting Edges: 4 per insert
• Grade: NC3020 - Tough CVD grade for demanding materials
• Chipbreaker: GR - Optimized for stainless steel and super alloys

Key Features & Benefits

• ✅ Exceptional Toughness: NC3020 grade provides superior resistance to chipping and thermal cracking, perfect for interrupted cuts and sticky materials like stainless steel.
• ✅ Optimized Chip Control: The "GR" chipbreaker effectively controls the tough, stringy chips produced when machining stainless steels and nickel-based alloys.
• ✅ Strong 1.6mm Radius: The large corner radius offers maximum edge strength for heavy roughing and stable semi-finishing operations.
• ✅ Cost-Effective: Each insert provides 4 indexable cutting edges, delivering great value for heavy-duty turning.
• ✅ Wide Compatibility: Fits all standard negative rake tool holders for CNMG643/CNMG1906 series inserts.

⚠️ Compatibility & Usage Note

• Requires negative rake tool holders for CNMG643 / CNMG1906 size inserts (e.g., PCLNR/L 2525M12 for 25mm shank).
• Always use within recommended speed and feed ranges for the workpiece material.

Package Includes

• 2pcs x CNMG190616-GR NC3020 Carbide Turning Inserts