Kennametal 4042939 Indexable Drill Insert Sppxfp KCU40

Product Description

The KENNAMETAL 4042939 is an SPPX-style indexable drill insert manufactured in solid carbide with a PVD-applied TiN and TiAlN dual-layer coating. Designed for indexable drill toolholders, this insert seats into the cutting head to perform the primary material removal in drilling operations. The KCU40 grade is engineered for toughness and wear resistance across a range of workpiece materials. At 0.494 inches inscribed circle diameter and a 0.1875-inch thickness, this insert fits tooling specified for the 120412 insert size. The FP chipbreaker geometry controls chip formation and evacuation during through-hole and blind-hole drilling in production machining environments.

This insert is suited for use in CNC machining centers and dedicated drilling machines in industrial and production settings. It is installed by machinists, toolroom technicians, and production setup personnel. The 0.0469-inch corner radius provides edge reinforcement for interrupted cuts and harder workpiece materials. The 0.1811-inch hole diameter accommodates the mounting screw or pin used to clamp the insert securely in the toolholder pocket. Applications span general-purpose drilling in metals where a balance of edge toughness and coating performance is required.

Key Features

• SPPX insert style in KCU40 carbide grade for toughness and wear resistance
• PVD-applied TiN and TiAlN dual-layer coating for thermal protection and extended tool life
• FP chipbreaker geometry promotes controlled chip formation and evacuation
• 0.494-inch inscribed circle diameter, 120412 insert size designation
• 0.0469-inch corner radius reinforces the cutting edge for demanding applications
• 0.1811-inch mounting hole diameter for secure clamping in the toolholder pocket

Compatibility

Designed as an OEM-style replacement insert for indexable drill toolholders accepting SPPX-style inserts in the 120412 size designation. Verify toolholder seat geometry and mounting screw specification before installation.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and lock out the machine before indexing or replacing inserts. Use the manufacturer-specified torque driver or wrench for the insert clamping screw to ensure proper seating without over-torquing. Inspect the toolholder pocket and seating surfaces for wear or debris before installing a new insert.