Walter 6839034 Turning Insert CCMT09T304-FM4 WSM20S Carbide

Product Description

The WALTER 6839034 is a CCMT-style carbide turning insert with a multilayer PVD coating of TiCN, Al2O3, and Al under the proprietary grade designation WSM20S. It features an 80-degree diamond shape with a positive rake angle of 6 degrees, a 7-degree relief angle, and a honed cutting edge for controlled entry into the workpiece. The insert measures 9.67 mm in length with a 9.53 mm inscribed circle and a 0.40 mm corner radius, delivering consistent chip control through the FM4 chip breaker geometry. It is held in place by a screw-type clamping method and carries two usable cutting edges per insert.

This insert is engineered primarily for turning stainless steel and superalloys and titanium, with secondary suitability for steel. It is rated for material grades M20, S20, and P20, making it a practical choice across a range of medium-duty finishing and semi-finishing operations. Applicable operations include turning, facing, and boring. The neutral hand orientation allows use in standard right-hand toolholders designed for CCMT geometry. It meets both ANSI and ISO standards and is cross-referenced by industry standard number CCMT3(2.5)1-FM4 WSM20S.

Key Features

• Multilayer PVD coating: TiCN, Al2O3, and Al for thermal resistance and wear protection in difficult-to-machine materials
• FM4 chip breaker geometry provides reliable chip control across turning, facing, and boring applications
• 80-degree diamond insert shape (CCMT) with positive rake for reduced cutting forces on stainless steel and superalloys
• Honed cutting edge style reduces microchipping during interrupted or continuous cuts
• Screw-type insert holding for secure, repeatable positioning in compatible toolholders
• Two cutting edges per insert maximize tool life per unit

Compatibility

Designed for use in CCMT-style screw-clamp toolholders. Compatible with applications targeting stainless steel, superalloys, titanium, and steel workpieces. Conforms to ANSI and ISO CCMT insert standards; industry standard number CCMT3(2.5)1-FM4 WSM20S.

Installation Notes

Installation is performed by machinists or CNC tooling technicians. Before indexing or replacing the insert, ensure the machine is powered down and the spindle is fully stopped. Seat the insert flat against the toolholder pocket and torque the clamping screw according to the toolholder manufacturer specification. Inspect the cutting edge and chip breaker for damage before each use; never run a visibly chipped or fractured insert.