Kennametal 4129576 Round Ceramic Turning Insert KYS25

Product Description

The KENNAMETAL 4129576 is a round ceramic turning insert designed for high-performance metal removal on superalloys and titanium workpieces. Part of the KENDEX series, this insert carries the KYS25 manufacturer grade and features a multilayer CVD coating of Al2O3 and TiCN, delivering high wear resistance with moderate toughness. The full-radius round shape provides 8 available cutting edges, maximizing tool life between index cycles. The insert measures 0.5 inches in inscribed circle diameter and 0.3125 inches in thickness. It is installed via clamp-style holding and suits turning, facing, and boring operations. Licensed machinists and CNC operators working in aerospace and high-temperature alloy applications are the primary users.

This insert is intended for machining superalloys and titanium, material group code S, in applications demanding consistent wear resistance under demanding thermal and mechanical loads. The flat-top chip breaker geometry and T-Land cutting edge style control chip flow during continuous or interrupted passes. Typical install scenarios include finish and semi-finish turning on horizontal or vertical CNC lathes as well as boring bar applications where a round insert profile is required. The maximum depth of cut is 0.1665 inches. The neutral hand configuration makes it adaptable to both left- and right-hand toolholders.

Key Features

• SiAlON ceramic base material with multilayer CVD Al2O3 and TiCN coating for superalloy and titanium machining
• 8 usable cutting edges per insert for extended tool economy
• Full-radius round insert shape (ANSI code RNG45) compatible with clamp-style toolholders
• Flat-top chip breaker with T-Land edge for controlled chip formation at negative rake angles
• Rated for turning, facing, and boring in a single insert style
• Conforms to ANSI and ISO standards; ISO code RNG120700

Compatibility

Designed as an OEM-style replacement and standard production insert for clamp-style round-insert toolholders conforming to ANSI insert code RNG45 and ISO insert code RNG120700. Suitable for use in turning, facing, and boring applications on superalloys and titanium.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine spindle before indexing or replacing inserts. Use a calibrated torque wrench and the toolholder manufacturer's specified clamp screw when securing the insert to avoid cracking the ceramic substrate. Inspect the insert seat and clamp for debris or damage before each index; ceramic inserts are brittle and will fracture if seated improperly.