Ingersoll Cutting Tools 6212861 Cnmm Turning Insert

Product Description

The INGERSOLL CUTTING TOOLS 6212861 is a solid carbide CNMM-style turning insert designed for single-point turning operations on steel workpieces. It features a diamond-shaped insert body with an 80-degree included angle and a neutral hand orientation, making it suitable for both roughing and finishing passes where controlled chip formation is critical. The TT8125B grade substrate carries a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, providing wear resistance, thermal protection, and oxidation resistance across a broad range of cutting speeds. With a 0.063-inch corner radius and an RH chip breaker geometry, this insert delivers consistent performance in general steel turning applications. It is installed by machinists and CNC operators using a clamp-style insert holding method.

This insert is intended for use in steel turning applications, classified under primary workpiece material code P. The CNMM insert style with negative rake and a clearance code of N is well-matched for rigid setups on CNC lathes and turning centers where higher cutting forces are acceptable. The RH chip breaker geometry promotes reliable chip evacuation during continuous or interrupted cuts in carbon steel, alloy steel, and similar ferrous materials. With a maximum depth of cut of 0.354 inches and an inscribed circle of 0.750 inches, this insert handles medium to heavy material removal rates in production environments.

Key Features

• CVD multilayer coating: TiCN, Al2O3, TiN for extended tool life in steel turning
• Solid carbide substrate, TT8125B grade, engineered for steel (P-code) workpieces
• Diamond insert shape (80-degree included angle) with negative rake for strength and stability
• 0.063-inch corner radius with RH chip breaker geometry for consistent chip control
• Maximum depth of cut of 0.354 inches supports medium to heavy roughing passes
• Clamp-style holding method for secure seating in compatible toolholders

Compatibility

Designed to fit clamp-style CNMM toolholders accepting a 644 insert size with a 0.750-inch inscribed circle and a 0.250-inch insert thickness. ANSI code CNMM644RHTT8125B and ISO code CNMM190616RH TT8125B can be used to cross-reference compatible toolholder systems.

Installation Notes

This insert is installed by qualified machinists or CNC operators following standard turning insert replacement procedures. Power down and lock out the machine spindle before changing inserts. Verify that the toolholder seat and clamp are clean and free of chips before seating the new insert, as debris under the insert can cause premature edge failure or insert breakage. Cutting parameters including speed, feed, and depth of cut should be selected based on workpiece material, machine rigidity, and the insert manufacturer's recommended data for the TT8125B grade.