Kennametal 1743904 Threading Insert 16 Tpi 1/4 in Ic KC5025

Product Description

The KENNAMETAL 1743904 is a solid carbide laydown threading insert designed for right-hand internal UN thread cutting at 16 threads per inch (TPI). Carrying ISO code LT11NR16UN and manufactured to grade KC5025, this insert features a physical vapor deposition (PVD)-applied TiAlN coating that extends tool life when cutting ferrous and difficult-to-machine materials. The 1/4-inch (6.35 mm) inscribed circle and 0.126-inch (3.04 mm) thickness conform to LT11 insert geometry standards. Machinists and CNC programmers running UN-threaded bores on lathes and turning centers will find this insert suited for precision threading operations in production environments.

This insert is intended for internal threading applications on steel, stainless steel, cast iron, superalloys, and titanium workpieces. It fits standard LT11NR toolholders used on CNC lathes and manual turning equipment for UN-profile thread forms. The 16 TPI designation makes it a common choice for machining unified national coarse and fine thread series bores in the mid-to-large diameter range. Typical users include journeyman machinists, tool-and-die makers, and CNC operators working in job shops, production facilities, and aerospace or energy-sector machine shops.

Key Features

• Solid carbide substrate with KC5025 grade for toughness and wear resistance in interrupted and continuous cuts
• TiAlN PVD coating for elevated heat resistance and extended insert life on steel and stainless steel
• Right-hand internal cut geometry for UN thread standard — ISO code LT11NR16UN
• 16 TPI configuration covers a broad range of unified thread series bore applications
• 1/4-inch inscribed circle with 0.126-inch thickness — fits LT11NR insert pockets
• Rated for primary workpiece materials including steel, stainless steel, cast iron, superalloys, and titanium

Compatibility

Designed for use in LT11NR-style internal threading toolholders. Compatible with workpiece materials including steel, stainless steel, cast iron, superalloys, and titanium as specified by the manufacturer. Specific toolholder compatibility should be confirmed against KENNAMETAL toolholder documentation for the LT11NR insert pocket standard.

Installation Notes

Insert seating and clamping should be performed by a qualified machinist following the toolholder manufacturer's torque specifications for the clamping screw. Ensure the machine spindle is fully stopped and the tool turret is locked before indexing or replacing inserts. Verify thread form and TPI match the workpiece drawing before initiating the threading cycle. Dispose of worn carbide inserts per applicable shop and local regulations for carbide tooling waste.