Sandvik Coromant 7860994 VNMG332-PM 4425 Turning Insert

Product Description

The SANDVIK COROMANT 7860994 is a VNMG-style turning insert engineered for external turning operations on steel and cast iron workpieces. It carries the manufacturer grade 4425 and features a CVD-applied multilayer coating stack of Al2O3, TiN, and TiCN for thermal resistance and wear protection at the cutting edge. The insert has a 35-degree diamond shape, a 3/8-inch inscribed circle, and a 1/32-inch corner radius. With four cutting edges and a neutral hand orientation, it delivers consistent performance across a range of turning setups. It belongs to the T-Max P series and is assigned ISO code VNMG 16 04 08-PM 4425.

This insert is intended for CNC lathe and turning center applications targeting steel (ISO material group P) as the primary workpiece material and cast iron (ISO material group K) as the secondary. The PM chip breaker geometry is suited for medium machining passes where controlled chip formation is critical. Typical install scenarios include production turning of shafts, flanges, and general-purpose steel components. It is sold individually with a minimum order quantity of 10 units and is packaged as a single insert per package.

Key Features

• CVD multilayer coating: Al2O3, TiN, and TiCN for elevated hot hardness and flank wear resistance
• 35-degree diamond insert shape (V) with neutral hand for flexible tool holder compatibility
• PM chip breaker geometry optimized for medium turning on steel and cast iron
• Four usable cutting edges per insert to extend tooling value
• Compatible insert holding methods: clamp and screw for rigid, low-vibration clamping
• ISO code VNMG 16 04 08-PM 4425 for cross-reference sourcing

Compatibility

Designed for use in VNMG-style tool holders with a 3/8-inch inscribed circle seat; compatible with clamp- and screw-style clamping systems. Verify tool holder clearance angle N and tolerance code M before installation. No specific machine or holder model numbers were provided in product data.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Power down and lock out the machine spindle before seating or indexing the insert. Use the appropriate torque wrench for the clamping screw to avoid micro-fractures on the cutting edge — refer to the tool holder manufacturer's torque specification. Inspect the insert seat for chips or debris before clamping to ensure full, flat contact across the seating surface.