Kennametal 1743985 Threading Insert 12 Tpi Stub Acme Carbide

Product Description

The KENNAMETAL 1743985 is a solid carbide laydown threading insert designed for cutting internal Stub Acme threads at 12 threads per inch (TPI). It carries the ISO designation LT16NR12STACME and is finished with a PVD-applied TiAlN coating, which extends tool life when machining abrasive or heat-resistant workpiece materials. The insert features a right-hand cutting orientation and a 3/8 inch (9.53 mm) inscribed circle with a thickness of 0.1430 decimal inches (3.44 mm). It is sized for NR-style insert seats in grade KC5025. Machinists and CNC operators use this insert in turning centers and threading lathes to produce precision internal Stub Acme thread forms.

This insert is suited for internal threading operations on steel, stainless steel, cast iron, superalloys, and titanium workpieces. It is a strong fit for job shops, aerospace, and general manufacturing environments where Stub Acme thread profiles are required in tough or work-hardening materials. The TiAlN coating provides thermal resistance during higher-speed threading passes, making it effective across a broad range of cutting conditions. Package quantity is one insert per unit.

Key Features

• Solid carbide substrate in manufacturer grade KC5025 for rigidity and wear resistance
• PVD TiAlN coating for improved thermal and oxidation resistance during threading
• Right-hand, internal Stub Acme thread form at 12 TPI
• 3/8 inch inscribed circle with 3.44 mm thickness for NR-16 insert seats
• Hole diameter of 0.1551 decimal inches for secure clamping in compatible toolholders
• Compatible workpiece materials include steel, stainless steel, cast iron, superalloys, and titanium

Compatibility

Designed for use in NR-style laydown threading toolholders accepting a size-16 insert with a 3/8 inch inscribed circle. Verify toolholder seat geometry and clamping style before installation. No specific toolholder model numbers were provided in the product data.

Installation Notes

Installation is performed by qualified machinists or CNC operators. Power down and lock out the machine spindle before changing inserts. Use the correct torque wrench or insert screw driver specified by the toolholder manufacturer to secure the clamping screw — do not overtighten. Inspect the insert seat and clamping components for wear or debris before seating the new insert to ensure proper contact and thread form accuracy.