Kennametal 1866641 Turning Insert TPGT2151LF KC5025

Product Description

The KENNAMETAL 1866641 is a solid carbide triangular turning insert in the TPGT2151LF geometry, coated with TiAlN via a PVD process and manufactured in the KC5025 grade. It carries a neutral hand orientation, a 60-degree included angle, and a 1/64-inch (0.0156-inch) corner radius. The insert measures 11 millimeters (0.4331 inches) in length with a 1/4-inch inscribed circle and seats via a screw-on holding method. With three cutting edges and a honed cutting edge style, it is well suited for high-productivity turning operations where tool life and edge consistency are critical. Installation and setup are performed by machinists and CNC turning specialists.

This insert is designed for turning, facing, and boring applications with a primary focus on stainless steel, superalloys, and titanium workpiece materials (ISO material codes M and S). The LF chip breaker geometry and positive rake angle support controlled chip formation at moderate-to-light depths of cut, with a maximum depth of cut of 1.25 millimeters (0.0492 inches). The TPGT style and screw-on mounting make it appropriate for precision finish turning where dimensional accuracy and surface finish are priorities. It conforms to both ANSI and ISO insert standards and carries material grades C2 and C6.

Key Features

• KC5025 grade TiAlN PVD coating for wear resistance on stainless steel and superalloy workpieces
• TPGT2151LF geometry with LF chip breaker for controlled chip evacuation in finish turning
• Positive rake angle with honed cutting edge for reduced cutting forces
• Three usable cutting edges per insert on a 60-degree triangle form
• Screw-on mounting with clearance code P and tolerance code G for repeatable seating
• Rated for turning, facing, and boring across multiple operation types

Compatibility

Designed as a screw-on replacement turning insert conforming to ANSI and ISO TPGT2151LF industry standards. Compatible with toolholders accepting TPGT-style screw-on inserts with a 0.1142-inch (2.80 mm) hole diameter. Verify toolholder pocket geometry before installation.

Installation Notes

Installation is performed by a qualified machinist or CNC turning technician. Power down and lock out the machine spindle before seating or removing any insert. Use the appropriate torx or hex key to torque the clamping screw to the toolholder specification provided by the toolholder manufacturer — do not estimate or hand-tighten. Inspect the insert pocket and seating surfaces for debris or wear before installing a new insert.