Kennametal 6904790 CNGA432EMT Pcbn Turning Insert

Product Description

The KENNAMETAL 6904790 is a PCBN turning insert with an ANSI designation of CNGA432EMT and ISO code CNGA120408EMT. It carries manufacturer grade KBH20 and a multilayer TiN and AlTiN coating applied via PVD process. The insert features an 80-degree diamond (rhombic) shape, a flat-top chip breaker, and honed cutting edges with a negative rake and negative side clearance. With two cutting edges and a neutral hand orientation, it is suited for high-hardness interrupted and continuous turning operations. Licensed machinists and CNC operators working on hardened ferrous materials install this insert in KENLOC-compatible toolholders.

This insert is designed for turning, facing, and boring operations on hard workpiece materials, corresponding to ISO application group H, with material grades H15 and H25. It performs in both light and moderate depths of cut on hardened steel, hardened cast iron, and similar high-hardness components. The flat-top geometry and honed edge prep reduce micro-chipping when entering hardened surfaces. It is appropriate for precision finishing and semi-finishing passes in production CNC turning environments where consistent edge life on hard materials is critical.

Key Features

• PCBN insert material with multilayer TiN and AlTiN PVD coating for hardened-material performance
• 80-degree diamond insert shape (CNGA) with negative rake and negative side clearance for secure seating
• Honed cutting edge style minimizes micro-chipping on hard and interrupted surfaces
• Two cutting edges with neutral hand for versatile mounting orientations
• Clamp and pin holding method compatible with KENLOC toolholder series
• Flat-top chip breaker geometry suitable for turning, facing, and boring applications

Compatibility

Designed for use in KENLOC-series toolholders that accept CNGA-style inserts. Clamp and pin holding method required. Meets ANSI and ISO dimensional standards for CNGA432 and CNGA120408 insert seats.

Installation Notes

Installation is performed by qualified CNC machinists or tool-crib technicians. Always power down and lock out the machine spindle before changing inserts. Seat the insert fully against the pocket walls before tightening the clamp or engaging the pin to prevent edge chipping under load. Inspect the toolholder pocket for wear or debris before installing a new insert edge.