Kennametal 3769393 Turning Insert TPMT21.51FP KCU10 Carbide

Product Description

The KENNAMETAL 3769393 is a solid carbide turning insert designated TPMT21.51FP in ANSI sizing, grade KCU10, with an AlTiN (aluminum titanium nitride) PVD coating. It features a triangular shape with a 60-degree included angle, a 0.25-inch inscribed circle, and a 1/64-inch (0.0156-inch) corner radius. The FP chip breaker geometry is tuned for finishing operations, and the positive rake and honed cutting edge promote clean chip formation at light depths of cut. Three usable cutting edges are available per insert. Licensed machinists and CNC programmers specify this insert for high-wear-resistance applications across steel, stainless steel, and cast iron workpieces.

This insert is suited for finishing passes in turning, facing, and boring operations on CNC lathes and turning centers. It is designed for use in screw-on style toolholders that accept TPMT geometry inserts. Primary workpiece materials include stainless steel, superalloys, titanium, steel, and cast iron. The AlTiN PVD coating maintains hardness and oxidation resistance at elevated cutting temperatures, making it a practical choice in both dry and minimal-quantity lubrication setups where tool life consistency is critical.

Key Features

• AlTiN PVD coating provides high wear resistance across steel (P), stainless steel (M), and cast iron (K) material groups
• FP chip breaker geometry optimized for finishing operations with positive rake angle of 15 degrees
• Triangular insert shape delivers 3 usable cutting edges per insert, reducing per-edge tooling cost
• Honed cutting edge style reduces micro-chipping on difficult-to-machine materials including superalloys and titanium
• Positive side clearance (clearance code P) supports clean shearing action at light depths of cut
• Screw-on holding method ensures repeatable seating and consistent tool offset repeatability

Compatibility

Designed for screw-on style TPMT toolholders conforming to ANSI insert code TPMT2151 and ISO insert code TPMT110204. Suitable for turning, facing, and boring applications on CNC lathes accepting triangular inserts with a 0.25-inch inscribed circle.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine spindle before seating or replacing the insert. Use the manufacturer-recommended torx or hex key to snug the clamping screw to proper engagement without stripping the insert pocket threads. Inspect the pocket seat and clamping screw for wear or debris before each insert index to maintain dimensional accuracy at the cutting edge.