Kennametal 1724331 Threading Insert 12 Tpi Un Carbide

Product Description

The KENNAMETAL 1724331 is a solid carbide laydown threading insert designed for internal UN thread cutting at 12 threads per inch (TPI). Manufactured to ISO code LT16NR12UN and offered in the KC5010 grade with a PVD-applied TiAlN coating, this right-hand insert delivers wear resistance and thermal stability in demanding threading operations. The 3/8-inch (9.53 mm) inscribed circle and 0.1430-inch thickness conform to standard LT16 toolholder seats. It is installed by machinists and tool-and-die professionals running CNC lathes or manual threading operations on steel, stainless steel, cast iron, superalloys, and titanium workpieces.

This insert is suited for internal UN thread-form cutting in production and job-shop environments where consistent thread profile accuracy is required. The TiAlN PVD coating extends tool life when threading harder or abrasive materials, including stainless steel and superalloys. Typical applications include threading bores on hydraulic fittings, fastener components, and precision machined parts across aerospace, oil-and-gas, and general industrial manufacturing.

Key Features

• Solid carbide substrate with PVD TiAlN coating for heat and wear resistance
• Right-hand, internal UN thread form at 12 TPI
• KC5010 grade engineered for steel, stainless steel, cast iron, superalloys, and titanium
• 3/8-inch inscribed circle conforming to LT16 insert seat standards
• Cutting edge to theoretical edge length of 0.0430 inches; face of insert to tip centerline of 0.0550 inches
• Hole diameter of 0.1551 inches for secure clamping in compatible toolholders

Compatibility

Designed as an OEM-style replacement and standard production insert for LT16-series internal threading toolholders accepting NR-style laydown threading inserts with a 3/8-inch inscribed circle.

Installation Notes

Installation should be performed by a qualified machinist with the machine powered down and the spindle locked before insert exchange. Seat the insert fully and torque the clamping screw per the toolholder manufacturer's specification using the appropriate Torx or hex key. Inspect the insert seat for chips or debris before seating a new insert. Verify thread form and pitch with a thread gauge after the first pass when changing inserts.