Kennametal 1743899 Laydown Threading Insert 32 Tpi

Product Description

The KENNAMETAL 1743899 is a solid carbide laydown threading insert designed for internal UN thread cutting at 32 threads per inch (TPI). Carrying the ISO code LT11NR32UN and manufactured in grade KC5025, this insert features a TiAlN coating applied via PVD process, delivering elevated heat and wear resistance in demanding threading operations. With a 1/4-inch (6.35 mm) inscribed circle and a thickness of 0.126 inches (3.04 mm), it is sized for precision threading toolholders using the NR insert style. Machinists and CNC operators install this insert in turning centers and dedicated threading lathes when producing internal UN-standard threads in production or job-shop environments.

This insert is suited for right-hand internal threading applications across a broad range of workpiece materials, including steel, stainless steel, cast iron, superalloys, and titanium. The KC5025 grade is engineered to maintain edge integrity under the interrupted and continuous cutting conditions common in internal threading passes. It is commonly used in CNC turning operations where consistent thread form and tool life are critical, particularly in production runs requiring repeatable 32 TPI UN-standard internal threads.

Key Features

• Solid carbide construction in KC5025 grade for wear resistance in steel, stainless, cast iron, superalloys, and titanium
• TiAlN coating via PVD process for improved thermal protection and extended tool life
• 32 TPI UN internal thread form, right-hand cut, ISO code LT11NR32UN
• 1/4-inch inscribed circle with NR insert style for compatibility with standard laydown threading toolholders
• Thickness of 0.126 inches (3.04 mm) for accurate seating and consistent thread geometry
• Hole diameter of 0.128 inches (3.25 mm) for positive mechanical clamping

Compatibility

Designed as an OEM-style replacement or direct-use insert for NR-style laydown threading toolholders accepting size 11 inserts with a 1/4-inch inscribed circle. Verify toolholder specifications against the LT11NR32UN insert style before installation.

Installation Notes

Threading inserts should be installed by qualified machinists or CNC tooling technicians with the machine powered down and the spindle fully stopped before any insert change. Use the correct torque wrench per the toolholder manufacturer specifications when tightening the clamping screw — do not over-tighten, as carbide inserts are brittle and can fracture under uneven clamping force. Inspect the insert pocket and clamping seat for chips or debris before seating the new insert. Confirm thread hand, TPI, and insert orientation against the job setup sheet before initiating the first threading pass.