Kennametal 1743737 Threading Insert 20 Tpi Unj Carbide

Product Description

The KENNAMETAL 1743737 is a solid carbide laydown threading insert designed for external UNJ thread cutting at 20 threads per inch. It carries the KC5025 manufacturer grade with a PVD-applied TiAlN coating, delivering wear resistance and thermal stability in demanding threading operations. The insert uses an ER style seat with an inscribed circle of 3/8 inch (9.53 mm) and a thickness of 0.1430 inch (3.44 mm). It is a right-hand insert intended for use on CNC lathes and turning centers by machinists and toolroom professionals working to UNJ thread standards.

This insert is suited for threading steel, stainless steel, cast iron, superalloys, and titanium workpieces. UNJ threads feature a controlled radius at the root, making them common in aerospace and high-fatigue applications where thread root integrity is critical. The LT16ER20UNJ ISO code confirms compatibility with ER-style laydown insert holders sized for the 16 insert size code. It is a single-insert package with a minimum order quantity of 10 units, typical for production threading programs where consistent insert changeover is required.

Key Features

• KC5025 carbide grade with PVD TiAlN coating for elevated-temperature and abrasion resistance
• 20 TPI external UNJ thread form with controlled root radius for aerospace-grade thread profiles
• Right-hand cut orientation for standard external threading passes
• 3/8 inch inscribed circle in ER-style laydown geometry for secure seating in matching toolholders
• Rated for steel, stainless steel, cast iron, superalloys, and titanium workpiece materials
• ISO designation LT16ER20UNJ for direct cross-reference and holder selection

Compatibility

Designed for use in ER-style laydown threading insert holders accepting the LT16 insert size code. Refer to KENNAMETAL toolholder documentation for specific holder model selection based on insert size code 16 and ER seat geometry.

Installation Notes

Installation should be performed by a qualified machinist following the toolholder manufacturer torque and clamping procedures for laydown-style inserts. Power down and lock out the machine spindle before seating or replacing the insert. Ensure the insert pocket and locating surfaces are clean and free of chips before clamping to maintain thread form accuracy. Do not exceed the insert manufacturer recommended cutting parameters for the workpiece material grade being threaded.