Kennametal 1743909 Threading Insert 28 Tpi Un KC5025

Product Description

The KENNAMETAL 1743909 is a laydown-style solid carbide threading insert designed for cutting internal UN threads. It carries the ISO designation LT16NR28UN and is manufactured to Kennametal grade KC5025 with a PVD-applied TiAlN coating. The insert is configured for right-hand cutting at 28 threads per inch (TPI) and fits a 3/8-inch inscribed circle seat. At 0.143 inches thick, it is built for rigid, high-repeatability threading operations on CNC lathes and turning centers. Licensed machinists and toolroom professionals install this insert as part of a qualified laydown threading toolholder system.

This insert is suited for internal threading in steel, stainless steel, cast iron, superalloys, and titanium. It is a common choice for production threading where consistent thread form and tool life across high volumes are required. The KC5025 grade with TiAlN finish is optimized for interrupted cuts and elevated cutting temperatures typical of difficult-to-machine materials. The NR insert style and 28 TPI pitch target fine-thread applications in standard UN inch thread systems.

Key Features

• Solid carbide construction with PVD TiAlN coating for wear and heat resistance
• 28 TPI UN internal thread form, right-hand orientation
• KC5025 grade rated for steel, stainless steel, cast iron, superalloys, and titanium
• 3/8-inch (9.53 mm) inscribed circle for standard LT16 laydown toolholder seats
• Thickness of 0.143 inches (3.44 mm) for precise laydown seating and repeatability
• 0.155-inch hole diameter for positive toolholder retention

Compatibility

Designed as an OEM-style replacement threading insert for LT16-series laydown threading toolholders accepting a 3/8-inch inscribed circle insert with NR geometry.

Installation Notes

This insert is installed by machinists or toolroom technicians into a qualified LT16 laydown threading toolholder. Power down and lock out the machine spindle before changing inserts. Use the correct torque wrench and manufacturer-specified clamping screw to secure the insert; avoid overtightening the retention screw. Verify thread pitch and hand orientation against the workpiece drawing before starting the threading cycle.