Kennametal 5640491 TPMT18151LF KCM15B Carbide Turning Insert

Product Description

The KENNAMETAL 5640491 is a TPMT-style carbide turning insert with an industry standard number of TPMT18151LF and a manufacturer grade of KCM15B. It features a multilayer CVD coating of TiCN and Al2O3 applied via MTCVD process, delivering wear resistance and thermal protection during continuous and interrupted cutting operations. The insert has a 60-degree triangular shape with three cutting edges, a positive rake angle of 5 degrees, a relief angle of 11 degrees, and a honed cutting edge style. With a corner radius of 0.0156 inches and a screw-on holding method, it is suited for finish to semi-finish turning on CNC lathes and turning centers. Machinists and CNC operators working in production shops install this insert.

This insert is designed for turning, facing, and boring operations. Its primary workpiece materials are steel, stainless steel, superalloys, and titanium, corresponding to ISO material codes P, M, and S. The LF chip breaker geometry supports controlled chip formation at moderate to light depths of cut, making it well suited for close-tolerance part work and finishing passes on difficult alloys. It meets both ANSI and ISO standards and carries ISO code TPMT090204LF, confirming dimensional interchangeability across compatible toolholders that accept TPMT-style screw-on inserts.

Key Features

• Multilayer CVD coating: TiCN and Al2O3 via MTCVD for enhanced crater and flank wear resistance
• 60-degree triangle shape with 3 cutting edges for efficient tool utilization
• LF chip breaker geometry optimized for turning, facing, and boring on steel, stainless, and superalloys
• Positive rake angle with honed edge for reduced cutting forces and improved edge stability
• Screw-on insert holding method for secure, repeatable seating in compatible toolholders
• Compliant with ANSI and ISO standards; ISO code TPMT090204LF

Compatibility

Designed as a screw-on TPMT-style replacement insert for toolholders accepting TPMT inserts per ANSI and ISO standards. Compatible with applications involving steel, stainless steel, superalloys, and titanium workpiece materials (ISO codes P, M, S). No specific toolholder model numbers were provided in the product data.

Installation Notes

Installation is performed by qualified CNC machinists or toolroom technicians. Power down and lock out the machine spindle before changing inserts. Use the correct torque driver for the screw-on clamp screw to ensure proper seating without cracking the insert. Inspect the toolholder pocket for wear or debris before installing a new insert, as a damaged pocket will compromise edge repeatability and dimensional accuracy.