Kennametal 1743769 Threading Insert 27 Tpi Npt KC5025

Product Description

The KENNAMETAL 1743769 is a solid carbide laydown threading insert designed for external NPT thread cutting on CNC lathes and threading machines. Carrying the ISO code LT16ER27NPT and manufacturer grade KC5025, this insert cuts 27 threads per inch in a right-hand orientation. The KC5025 grade substrate is PVD-coated with TiAlN, providing elevated heat resistance and edge durability when threading ferrous and high-temp alloys. The 3/8-inch (9.53 mm) inscribed circle and ER insert style make it compatible with standard LT-style threading toolholders used in production and job-shop turning applications. Licensed machinists, CNC operators, and tool-and-die professionals install this insert as part of routine threading operations on pipe and fitting stock.

This insert is suited for threading steel, stainless steel, cast iron, superalloys, and titanium workpieces to NPT standard. Its external thread geometry and 27 TPI specification make it the correct choice for producing NPT pipe threads on components such as fittings, couplings, and nipples. The laydown seating style allows precise, repeatable positioning in compatible toolholders, supporting consistent thread form across high-volume runs or short-run precision work.

Key Features

• Solid carbide construction with PVD-applied TiAlN coating for extended tool life on abrasive and work-hardening materials
• 27 TPI NPT external thread profile, right-hand cut
• ER insert style with 3/8-inch inscribed circle for use in standard LT16-series toolholders
• KC5025 grade optimized for steel, stainless steel, cast iron, superalloys, and titanium
• Thickness of 0.1430 inches (3.44 mm) for stable laydown seating
• Hole diameter of 0.1551 inches for secure mechanical clamping

Compatibility

Designed as an OEM-style replacement threading insert for use in LT16 ER-style laydown threading toolholders. Specific toolholder compatibility should be confirmed against the LT16ER insert pocket specification prior to installation.

Installation Notes

Installation is performed by qualified CNC machinists or lathe operators. Power down and lock out the machine before seating or removing the insert. Use the correct torque wrench and clamp screw specified for the toolholder to avoid cracking the carbide substrate — do not overtighten by feel alone. Confirm thread form with a calibrated NPT thread gauge after the first pass before committing to a full production run.