Walter 7091888 CNMG120408-FM5 WMP20S Turning Insert

Product Description

The WALTER 7091888 is a CNMG-style indexable turning insert manufactured from solid carbide with a multilayer CVD coating of TiCN, Al2O3, and TiCN under the proprietary grade designation WMP20S. The insert features an 80-degree diamond shape, a neutral hand orientation, a 0.8 mm corner radius, and four usable cutting edges with a chamfered and honed cutting edge style. It is engineered for external and internal turning operations on CNC lathes and machining centers. The FM5 chip breaker geometry and negative rake angle are optimized for consistent chip control across a broad range of depths of cut and feed rates. Licensed machinists and CNC lathe operators are the primary installers of this consumable tooling insert.

This insert is rated primarily for steel and stainless steel workpiece materials (ISO material codes P and M) and secondarily for super-alloys and titanium (ISO material code S). Applicable material grades are M20, P25, and S20, making it suitable for medium finishing to medium roughing passes. Multi-use applications include turning, facing, and boring. The ISO designation CNMG120408-FM5 WMP20S and the industry standard number CNMG432-FM5 WMP20S both apply to this insert, allowing cross-reference with toolholder systems designed for CNMG 432 pockets.

Key Features

• Multilayer CVD coating (TiCN / Al2O3 / TiCN) under grade WMP20S for wear resistance on steel and stainless steel
• FM5 chip breaker geometry for controlled chip evacuation across turning, facing, and boring operations
• Four cutting edges with chamfered and honed edge prep for edge strength and surface finish consistency
• Negative rake, 0-degree relief angle (clearance code N) suited for high-stability CNMG toolholders
• Clamp and pin insert holding method compatible with standard CNMG pocket toolholders
• Conforms to ANSI and ISO standards; ISO code CNMG120408-FM5 WMP20S

Compatibility

Designed to seat in toolholders with CNMG 432 (CNMG120408) insert pockets using clamp and pin retention. The ISO code CNMG120408-FM5 WMP20S and industry standard number CNMG432-FM5 WMP20S can be used to cross-reference compatible toolholder systems.

Installation Notes

Insert indexing and replacement should be performed by a qualified machinist or CNC tooling technician with the machine powered down and the spindle fully stopped. Use the appropriate torque wrench and clamp hardware specified by the toolholder manufacturer when securing the insert. Inspect the insert pocket and seating surfaces for chips or debris before seating a new insert. Never exceed the maximum depth of cut or feed rate specified in the toolholder or machine tool documentation.