Tungaloy 6852939 Turning Insert VNMG331 T5125 Carbide

Product Description

The TUNGALOY 6852939 is a VNMG331 indexable turning insert designed for precision machining of cast iron workpieces. Built from solid carbide and finished with a multilayer CVD coating of TiCN, Al2O3, and TiN under the T5125 grade, this insert delivers high wear resistance with moderate toughness suited to the K15 and K30 material grade range. The 35-degree diamond (rhombic) insert shape provides a sharp, defined cutting geometry. With 4 cutting edges and a neutral hand orientation, it offers consistent performance across medium machining chip breaker conditions. Licensed machinists and CNC operators install this insert in compatible turning toolholders for production and job-shop environments.

This insert is intended for cast iron applications in the K material classification, covering grades K15 through K30. Typical operations include turning, facing, boring, back turning, and back boring on CNC lathes and turning centers. The chamfered and honed cutting edge style suits interrupted and continuous cuts in medium-stock-removal scenarios. The negative rake angle of -15 degrees and negative side clearance geometry are standard for this insert style, supporting rigid clamping in high-feed setups.

Key Features

• Multilayer CVD coating: TiCN plus Al2O3 plus TiN for extended tool life in cast iron
• T5125 grade optimized for K15 and K30 cast iron with high to moderate wear resistance
• 35-degree diamond (V) insert shape with 4 usable cutting edges
• Chamfered and honed cutting edge style reduces chipping at entry and exit
• Compatible with clamp and pin insert-holding methods
• Medium machining chip breaker suitable for moderate depth-of-cut and feed-rate conditions

Compatibility

Designed as an OEM-style replacement and standard indexable insert for VNMG-style turning toolholders conforming to ANSI and ISO insert specifications. ANSI insert code VNMG331; ISO insert code VNMG160404.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine before indexing or replacing inserts. Use the appropriate torque wrench and insert clamp hardware specified by the toolholder manufacturer - do not overtighten clamping screws. Inspect the toolholder pocket and seating surface for wear or debris before seating a new insert.