Kennametal 1799389 Threading Insert KC5025 Carbide Un 12 Tpi

Product Description

The KENNAMETAL 1799389 is a carbide threading insert in the Top Notch series, designed for internal thread cutting applications. Manufactured to the NTC3R12I designation, this right-hand insert carries the KC5025 grade with a PVD-applied TiAlN finish, giving it strong wear resistance and thermal stability during threading operations. It cuts UN-standard threads at 12 TPI with a 60-degree included angle, making it a direct-fit choice for machinists running internal threading passes on lathes and turning centers. The insert measures 0.1949 inches thick with a 0.1480-inch tip-to-top height and a corner radius of 0.0040 inches.

This insert is suited for internal threading on CNC lathes, manual engine lathes, and turning centers where UN-standard thread forms are required. The KC5025 carbide grade with TiAlN coating performs well in a range of ferrous and non-ferrous workpiece materials corresponding to C2 and C6 material grades. It is used by machinists and tool-and-die professionals in production and job-shop environments where consistent thread form accuracy and insert longevity are priorities. Each package contains one insert, with a minimum order quantity of 5 units.

Key Features

• KC5025 carbide grade with PVD TiAlN coating for wear resistance and extended tool life
• Cuts UN internal threads at 12 TPI with a 60-degree included angle
• Right-hand cutting orientation for standard lathe and turning center setups
• Corner radius of 0.0040 inches for precise thread root geometry
• Top Notch series design for secure, repeatable seating in compatible toolholders
• Lightweight at 0.031 pounds, consistent with standard NTC size 3 insert form factor

Compatibility

Designed as an OEM-style replacement and standard production insert for Top Notch series internal threading toolholders accepting NTC size 3 inserts with right-hand orientation.

Installation Notes

Installation is performed by qualified machinists following standard carbide insert indexing and replacement procedures. Always power down and lock out the machine spindle before changing inserts. Use the appropriate torque wrench and Torx or clamping screw driver specified for the Top Notch toolholder to seat the insert securely without overtightening. Inspect the toolholder pocket for chips or wear before seating a new insert.