Kennametal 1743740 Threading Insert 14 Tpi Unj Carbide

Product Description

The KENNAMETAL 1743740 is a solid carbide laydown threading insert designed for external UNJ thread cutting on CNC lathes and turning centers. Running the ISO designation LT16ER14UNJ, this insert operates at 14 threads per inch with a right-hand cutting orientation and carries the KC5025 manufacturer grade — a PVD-applied TiAlN-coated carbide grade engineered for threading in steel, stainless steel, cast iron, and superalloys including titanium. The insert features a 3/8-inch inscribed circle and a nominal thickness of 0.1430 inches. It is a single-package unit sold with a minimum order quantity of 10.

This insert is suited for precision threading applications in aerospace, oil and gas, and general machining environments where UNJ thread form compliance is required. UNJ threads incorporate a controlled root radius that improves fatigue resistance over standard UN threads, making this insert appropriate for high-stress fastener and coupling applications. Machinists and CNC operators working on external threading passes in ferrous and exotic alloy materials will find this insert compatible with standard LT16 insert pockets on qualified toolholders.

Key Features

• KC5025 PVD TiAlN-coated carbide grade for extended tool life in steel, stainless, cast iron, and superalloys
• Right-hand external UNJ thread form at 14 TPI for fatigue-resistant thread cutting
• ER-style laydown insert geometry with ISO code LT16ER14UNJ for secure pocket seating
• 3/8-inch inscribed circle with 0.1430-inch thickness for dimensional consistency across setups
• Hole diameter of 0.1551 inches for positive screw clamping in standard LT16 toolholders

Compatibility

Designed as an OEM-style replacement threading insert for LT16-pocket external threading toolholders accepting ER-style laydown inserts. Consult your toolholder documentation to confirm pocket geometry and screw size before ordering.

Installation Notes

Insert installation and indexing should be performed by a qualified machinist or CNC tooling technician. Power down the spindle and engage the machine lockout before accessing the turret or tool block. Use a calibrated torque wrench and the appropriate Torx or hex key to seat the clamping screw — do not overtighten, as carbide inserts are brittle. Verify insert seating and runout before resuming cutting operations.