Kennametal 1743803 Laydown Threading Insert 4 Tpi Api

Product Description

The KENNAMETAL 1743803 is a solid carbide laydown threading insert designed for cutting external API Rotary Shoulder Connections threads on metalworking lathes and CNC turning centers. Carrying the KC5025 manufacturer grade with a PVD-applied TiAlN coating, this insert delivers the wear resistance and edge toughness required for threading alloy steels and the hard materials common in oilfield and downhole tooling applications. It cuts at 4 threads per inch (TPI) and features a 1/2 inch (12.70 mm) inscribed circle, making it a right-hand insert suited for external threading operations where precise API thread form accuracy is essential. Installation is performed by qualified machinists and CNC tooling setups.

This insert is intended for external API Rotary Shoulder Connections threading, a thread standard widely used in oilfield drill collars, subs, and rotary shouldered connections. It fits toolholders and boring bars compatible with the LT22ER insert style and 22ER seat geometry. Typical applications include petroleum equipment manufacturing, oilfield component repair shops, and contract machining operations producing API-spec threaded connections. The TiAlN PVD finish makes it suitable for dry or semi-dry cutting conditions at elevated surface speeds.

Key Features

• Solid carbide construction in KC5025 grade for high wear resistance in difficult-to-machine materials
• PVD TiAlN coating for thermal stability and extended tool life in dry and semi-dry cutting
• Right-hand external thread geometry conforming to API Rotary Shoulder Connections standard at 4 TPI
• 1/2 inch (12.70 mm) inscribed circle with 0.1880 inch thickness for rigid, predictable seating
• LT22ER laydown insert style for compatibility with standard 22ER toolholder pockets
• 0.1921 inch hole diameter for secure mechanical clamping without insert movement

Compatibility

Designed for use in toolholders accepting the LT22ER (22ER) laydown insert style with a 4.88 mm (0.1921 inch) mounting hole. Specific toolholder compatibility should be verified against the holder manufacturer documentation prior to use.

Installation Notes

This insert is installed and changed by qualified machinists or CNC tooling technicians. Power down and lock out the machine spindle before seating or removing the insert. Use the appropriate torx or hex key to the toolholder manufacturer torque specification for the clamp screw — do not overtighten or the carbide seat may crack. Confirm thread form and pitch with a thread gauge on the first part before committing to a production run.