Walter 6121609 Turning Insert DNMG433-MK5 WKK20S Carbide

Product Description

The WALTER 6121609 is a DNMG433-MK5 WKK20S solid carbide turning insert engineered for high-performance metal cutting in CNC lathe and turning center applications. It features a CVD-applied multilayer coating of TiCN, Al2O3, and TiCN, delivering wear resistance and thermal stability across a range of cutting conditions. The insert has a 55-degree diamond shape, a 1/2-inch inscribed circle, and a 3/64-inch corner radius. With four cutting edges and a neutral hand orientation, this insert suits high-volume production environments where tooling efficiency and consistent surface finish are priorities for machinists and CNC operators.

This insert is designed for turning, facing, boring, and back turning operations. Its primary target workpiece material is cast iron (ISO material code K, grade K20), with steel as the secondary workpiece material (ISO material code P, grade P10). The MK5 chip breaker geometry and chamfered-and-honed cutting edge style support stable chip control and reduced cutting forces across moderate to heavy depths of cut, making it well-suited for both roughing and semi-finishing passes in production machining environments.

Key Features

• CVD multilayer coating: TiCN / Al2O3 / TiCN for enhanced wear resistance and heat management
• 55-degree diamond insert shape (code D) with negative rake angle for strong edge geometry
• MK5 chip breaker geometry optimized for cast iron and steel cutting
• Four cutting edges with neutral hand orientation for maximum tooling value per insert
• Chamfered and honed cutting edge style reduces micro-chipping and improves edge stability
• Compatible with clamp and pin holding methods for secure, repeatable seating

Compatibility

Designed for use in DNMG-style insert toolholders accepting a 55-degree diamond insert with a 1/2-inch inscribed circle and clamp or pin retention. ISO designation: DNMG150412-MK5 WKK20S. ANSI industry standard number: DNMG433-MK5 WKK20S. Suitable for turning, facing, boring, and back turning applications on cast iron and steel workpieces.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Always power down and lock out the machine spindle before indexing or replacing inserts. Seat the insert fully against the toolholder pocket and tighten the clamp or pin per the toolholder manufacturer's specifications. Inspect the insert seating and edge condition before resuming cutting operations.