Kennametal 1557674 Turning Insert CNGA432T0420 KY4400 Ceramic

Product Description

The KENNAMETAL 1557674 is a ceramic turning insert carrying industry standard designation CNGA432T0420 in the KY4400 grade. Manufactured from alumina TiCN ceramic and finished with a PVD-applied TiN coating, this insert is engineered for high-speed hard-material turning where heat resistance and edge stability are critical. The 80-degree diamond (rhombic) shape provides a strong cutting geometry, while the T-Land cutting edge style and flat-top chip breaker suit negative-rake, neutral-hand applications. With four usable cutting edges, the insert delivers efficient cost-per-edge performance for production turning operations.

This insert is suited for turning, facing, and boring operations on hard workpiece materials (material code H), including hardened steels and wear-resistant alloys. It seats in KENLOC-style toolholders using a clamp-and-pin holding method. The neutral hand orientation accommodates a wide range of toolholder configurations on CNC lathes and turning centers in both production and job-shop environments. Licensed machinists and CNC operators working in precision metalworking are the primary installers.

Key Features

• KY4400 alumina TiCN ceramic grade with PVD TiN coating for hard-material turning
• 80-degree diamond (rhombic) insert shape with T-Land cutting edge for edge strength
• Flat-top chip breaker geometry; negative rake and zero rake angle
• Four cutting edges per insert for extended tool life and lower cost per edge
• Maximum depth of cut: 0.049 inches (1.25 mm)
• Meets ANSI and ISO standards; ANSI code CNGA432, ISO code CNGA120408
• Multi-use application: turning, facing, and boring

Compatibility

Designed for use with KENLOC-series toolholders that accept CNGA-style inserts secured by clamp-and-pin holding method. Compatible with toolholders specified for ANSI insert code CNGA432 and ISO insert code CNGA120408.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine spindle before seating or indexing the insert. Ensure the insert pocket and seating surfaces are clean and free of chips before clamping to maintain proper seating and dimensional accuracy. Do not exceed the maximum depth of cut specified for this insert geometry, as ceramic grades are sensitive to interrupted cuts and excessive lateral loading.