Sandvik Coromant 7860852 Turning Insert DNMG433-QM 4425

Product Description

The SANDVIK COROMANT 7860852 is a DNMG433-QM 4425 turning insert designed for external turning operations on CNC lathes and turning centers. This solid carbide insert features a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, engineered to deliver wear resistance and thermal stability during continuous and interrupted cuts. The 55-degree diamond shape (Insert Shape Code D) with a neutral hand orientation provides versatile approach angle options. With a 1.19 mm corner radius and an inscribed circle of 0.5 inches (12.70 mm), this insert is sized for moderate to heavy material removal passes. It belongs to Sandvik Coromant's T-Max P series, a platform built for high-productivity steel turning.

This insert is intended for machining steel (ISO material group P) as its primary workpiece material, with cast iron (ISO material group K) as a secondary application. The QM chip breaker geometry is suited for medium turning operations where chip control and surface finish consistency are priorities. It is typically installed by CNC machinists and toolroom technicians in production and job-shop environments running turning centers with appropriate DNMG-style toolholders and clamping systems. The ISO designation for this insert is DNMG 15 04 12-QM 4425.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for extended tool life on steel and cast iron
• 55-degree diamond insert shape with neutral hand for flexible toolholder compatibility
• 1.19 mm corner radius for a balance of edge strength and surface finish
• QM chip breaker geometry optimized for medium turning and reliable chip evacuation
• 4 cutting edges per insert for cost-effective indexing
• T-Max P series platform designed for high-productivity external turning

Compatibility

Designed for use in DNMG-style toolholders accepting a 0.5-inch inscribed circle insert with clamp or screw holding methods. Compatible with toolholders conforming to the DNMG 15 04 insert size code. Primary workpiece material is steel (ISO P); secondary is cast iron (ISO K).

Installation Notes

Installation is performed by qualified CNC machinists or toolroom technicians. Ensure the machine spindle is fully stopped and the turret is in a safe index position before indexing or replacing inserts. Use the appropriate torx or insert-clamping hardware specified by the toolholder manufacturer to secure the insert seat. Inspect the insert pocket and shim for wear or damage before seating a new insert to maintain correct cutting geometry.