Kennametal 4050687 CNMG432MP1 Carbide Turning Insert KCU10

Product Description

The KENNAMETAL 4050687 is a solid carbide turning insert in the CNMG432MP1 geometry, running the KCU10 grade with a PVD-applied TiAlN coating. It seats into KENLOC-style toolholders using a clamp and pin holding method and delivers negative rake cutting action on an 80-degree diamond insert shape. The inscribed circle measures 0.5 inches, insert thickness is 0.1875 inches, and the corner radius is 0.0313 inches (1/32 inch). With four usable cutting edges and an MP1 chip breaker geometry, it is built for medium-to-rough turning, facing, and boring operations where chip control across a range of workpiece materials is a priority. Licensed machinists and CNC operators in production and job-shop environments are the primary users.

This insert is rated for primary use on steel, stainless steel, and superalloys including titanium-based materials, corresponding to ISO material groups P, M, and S. Secondary applications cover cast iron, non-ferrous, and additional steel grades (ISO K, N, P). The MP1 chip breaker handles a broad depth-of-cut range, with a maximum depth of cut of 0.1691 inches. It suits both roughing and semi-finishing passes on CNC lathes and turning centers where consistent edge performance and reliable chip evacuation are required across moderate to aggressive feed rates.

Key Features

• PVD TiAlN coating improves heat resistance and edge wear life on abrasive workpiece materials
• MP1 chip breaker geometry supports turning, facing, and boring in a single insert style
• Four cutting edges per insert reduce per-edge tooling cost
• 80-degree diamond (CNMG) shape provides a strong cutting edge with versatile entry angle options
• Negative rake geometry with honed cutting edge style increases edge strength for interrupted and continuous cuts
• Meets ANSI and ISO standards; ISO code CNMG120408MP1 for cross-referencing

Compatibility

Designed for use in KENLOC-style toolholders that accept CNMG432 inserts with clamp and pin holding. Compatible with CNC lathes and turning centers configured for negative-rake CNMG geometry tooling. Primary workpiece materials are steel, stainless steel, and superalloys including titanium (ISO P, M, S); secondary compatibility covers cast iron and non-ferrous materials (ISO K, N).

Installation Notes

Installation is performed by a machinist or CNC setup technician. Power down and lock out the machine spindle before indexing or replacing inserts. Use the appropriate torque wrench and clamp hardware specified by the toolholder manufacturer when seating the insert — do not overtighten, as this can fracture the carbide substrate. Inspect the insert pocket and locating pin for wear or debris before seating a fresh edge.