Kennametal 1743999 Threading Insert 8 Tpi Api Round Carbide

Product Description

The KENNAMETAL 1743999 is a laydown threading insert designed for right-hand internal API Round thread cutting operations. Built from solid carbide with a PVD-applied TiAlN coating, this insert delivers consistent thread form accuracy at 8 threads per inch (TPI). The 3/8-inch (9.53 mm) inscribed circle and 0.1430-inch thickness conform to the LT16NR insert style geometry. The TiAlN finish improves heat resistance and wear life in demanding threading passes. Licensed machinists and CNC lathe operators use this insert in toolholders matched to the 16NR style for internal API Round thread applications common in oil-field and pipe-fitting production environments.

This insert is suited for internal threading on pipe and coupling components requiring API Round thread form compliance. The right-hand cutting geometry and 8 TPI designation make it appropriate for production threading in oil-country tubular goods (OCTG) and similar applications. The 0.1551-inch hole diameter accommodates the mounting screw for LT-style insert seats. It is sold individually per package with a minimum order quantity of 10 units.

Key Features

• Solid carbide substrate in Kennametal KC5025 grade for thermal stability in threading cuts
• PVD TiAlN coating extends edge life and supports higher cutting speeds
• API Round thread form at 8 TPI for oil-field pipe threading applications
• Right-hand internal cutting geometry in standard LT16NR insert style
• 3/8-inch (9.53 mm) inscribed circle with 0.1430-inch thickness for precise seating in compatible toolholders
• Mount hole diameter of 0.1551 inches for secure clamping in LT-style insert pockets

Compatibility

Designed for use in LT16NR-style internal threading toolholders that accept laydown insert geometry. Specific toolholder compatibility should be confirmed against Kennametal toolholder documentation for the 16NR insert style.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians on a lathe or turning center. Power down and lock out the machine before seating or replacing the insert. Use the correct torque driver for the mount screw to avoid fracturing the carbide substrate — do not overtighten by hand or with standard screwdrivers. Inspect the insert pocket for chips or debris before seating the new insert to ensure full contact and accurate thread form.